NEW SPECIES OF TROGLOBITIC SHRIMPS FROM MEXICO, WITH THE DESCRIPTION OF TROGLOMEXICANUS, NEW GENUS (DECAPODA: PALAEMONIDAE)

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1 JOURNAL OF CRUSTACEAN BIOLOGY, 19(1): , 1999 NEW SPECIES OF TROGLOBITIC SHRIMPS FROM MEXICO, WITH THE DESCRIPTION OF TROGLOMEXICANUS, NEW GENUS (DECAPODA: PALAEMONIDAE) Jose' Luis Villalobos, Fernando Alvarez, and Thomas M. Ilifle ABSTRACT A new genus of cavernicolous fresh-water palaemonid shrimp, Troglomexicanus, and two new species, 7: tarnaulipasensis and 7: huastecae, are described from El Abra limestone caves in the states of San Luis Potosi and Tamaulipas, northeastern Mexico. Troglomexicanus includes 7: perezfarfantar, formerly in the genus Troglocubanus. distributed also in El Abra limestone caves. The following characters shared by the 3 species support the creation of the new genus: rostrum without dorsal or ventral teeth, maxilla with single-lobed endite, bilobed epipodite of first maxilliped, second maxilliped without podobranch, and absence of antennal, hepatic, or branchiostegal spines of carapace. The maxilla with single-lobed endite and a bilobed epipodite of first maxilliped are two characters not shared with any other genus in the subfamily Palaemoninae. Previous to this study, the palaemonid genus MATERIALS AND METHODS Troglocubanus Holthuis, 1949, included six four distributed in Cuba [T. eigen- Individuals of the new species described herein were collected during the Blindcat Collecting Expedition to the manni (H~~, 1903), ':ibarensis (chase, Sierra de El Abra, San Luis Potosi-Tamaulipas. Mexico, 1943)3 T. inermis (Chase, 1943)9 and ' in March Descriptions of the two caves where the cis (Rathbun, 1912)1,.- One in Jamaica (T ':a- new s~ecies were ca~tured. ~hvsical and chemical con-, L, maicensis Holthuis, 1963), and one in M ~X-ditiong encountered, and collecting details are as follows. ico (T. perezfarfantae Villalobos, 1971). Cueva del Nacimiento del Rio Frb, Ejido El Nacimiento, Troglocubanus as proposed by Holthuis Municipio de Gdmez Farias, Tamaulipas. Mbxico, 9 and (1949), included troglobitic species, unpig- 10 March 1997 (Fig. l).-the cave entrance, situated at mented, with reduced eyes lacking a cornea, 155 m elevation, is located in a dry channel on the mouna carapace without hepatic or branchiostegal tain side immediately above the springs that give rise to Rio Frio. The small cave entrance leads about 10 m down spines, and a mandible without a palp. Variover breakdown to a dirt-floored room. From this point, able characters within the genus were the ros- a flowstone slope extends up through a well-decorated trum, which could be short and smooth or passage back to the level of the entrance. About 50 m well developed with many dorsal teeth, the from the entrance, a large dome pit is encountered. This presence or absence of an antennal spine, the 12-m diameter pit drops 40 m to a deep lake. Underwater, the cave descends over breakdown to a smooth-walled endite of the second maxilla which is bilobed phreatic passage at a depth of 50 m. This passage exin the Antillean species and single-lobed in tends horizontally for about 100 m to a vertical shaft that the Mexican species, and the epipodite of the goes up to an isolated lake with a 25-m high dome above first maxilliped which is bilobed in the Mex- it. No water currents were noticed. Two ho~nogeneous but discrete water masses were ican species. These important differences, found in the cave, based on in situ measurements of waarising between the Mexican T. pereifarfan- ter quality taken with a Hydrolab Data Sonde 3 Multitae and the Antillean species, were recog- probe Logger (Hydrolab Corporation, P.O. Box 50116, nized and discussed by Villalobos (1971). Austin, Texas 78763). Measurements of depth, tempera- However, Troglocubanus was preserved as a ture, specific conductance, ph, dissolved oxygen, and redox potential were taken at 2-s intervals over the course valid genus for all six species. of the dive. The upper 40 rn of the column in the cave Based on the finding of two new species water were uniform at 21.52"C, 0.43 millisiernens/cm from Mexico, collected in caves that are part (ps1cm) specific conductance, 3.4 mgll dissolved oxygen, of the same formation as the type locality for ph 7.76, and 361 mv redox potential. Below 41 m, temperature, specific conductance, dissolved oxygen, and re- T. peredarfantae, in which these important dox potential increased slightly to 21.63"C, 0.52 psicm, morphological differences between the An- 4.4 mgll, and 363 mv, respectively, while ph decreased tillean and Mexican species are preserved, a slightly to Both sets of values were markedly difnew genus, Troglomexicanus, is proposed. ferent from the Rio Frio springs located below the cave

2 112 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 19, NO Fig. 1. Map showing the location of the type localities of the species of Troglornexicanus, new genus, in the Sierra de El Abra, within the states of San Luis Potosi and Tamaulipas, MCxico. entrance. Spring water measured at 12 separate sites had markedly increased temperature, specific conductance, dissolved oxygen, and redox potential at 23.05"C pslcm, 5.4 mgll, and 380 mv, respectively, while ph decreased to These data suggest that the spring and cave waters are not directly connected and, considering that the spring-water parameters significantly extend the depth trends observed in the cave, come from considerable depths. Shrimps were collected by hand in individual vials. The shrimps were observed swimming in the water column primarily at depths below the 40-m chemocline. Troglobitic catfish (Ictaluridae, Prietella),mysids, isopods (Cirolanidae and Trichoniscidae), gastropods, and branchiobdelid worms were also collected from the same locations within the cave. Manantial de Sun Rafael de Los Castro, Municinio de Ciudad Mante, ~ama>i~as, Mexico, 13 March 1997 (Fig. l).-the s~ringentrance is located at the southern edge of the village f : San Rafael de Los Castros at an elevation of 98 m. The water surface is accessible at the bottom of a 4-m deep pit, but flows under a short natural bridge before emerging permanently on the surface. From this pit, the underwater cave continues as an irregular series of small to medium-sized chambers before adeep fissure extends to depths in excess of 60 m. The flow rate from the spring was very low at the time of visitation. Water quality measurements were made at 2-s intervals with a Hydrolab Data Sonde 3. The water mass within the cave was homogeneous at 27.3"C, 0.76 ps1cm specific conductance, 0.9 mgll dissolved oxygen, ph 7.47, and 335 mv redox potential. These values show markedly higher temperatures and lower dissolved oxygen than those at Cueva del Nacimiento del Rio Frio. Shrimps were collected by hand primarily from sections of the cave near the entrance at 0-15-m water depths. Troglobitic catfish (Ictaluridae, Prietella), isopods (Stenasellidae and Cirolanidae), and amphipods were also collected. Material of the new species treated herein is deposited in the Colecci6n Nacional de Crustaceos, Instituto de Biologia, Universidad Nacional Aut6noma de Mexico (CNCR). The abbreviations used are: cl = carapace length and tl = total length. RESULTS Troglomexicanus, new genus Troglocuhanus Villalobos, 1971: 1; Hobbs et al., 1977: 64; Reddell, 1981: 16; Holthuis, 1986: 607. Diagnosis.--Carapace smooth without antennal. he~atic. or branchiostegal s~ines. AnterOlaierafmargin with roundei sudorbital angle. Rostrum short, devoid of dorsal or ventral spines. Eyes reduced, cornea absent, unpigmented. Mandible without palp, maxilla

3 VILLALOBOS ETAL.: NEW SPECIES OF TROGLOBITIC SHRIMPS 113 with single-lobed endite, first maxilliped with bilobed epipodite, and second maxilliped without podobranch. First pair of pereiopods slender and chelate; second pair longer than first, with palm and fingers of chela elongated; remaining pereiopods not chelate, with simple dactyl. Propodus of fifth pair of pereiopods with sparse setae along posterior margin and with dense distal tuft. Distribution.-The distribution range of the genus is confined to limestone caves in the El Abra Formation, part of the Sierra de El Abra, a small mountain range of 125 km, that runs north-south 150 km west from the coast of the Gulf of Mexico. Sierra de El Abra is located in the northeastern portion of the state of San Luis Potosi and the adjacent southwestern section of the state of Tamaulipas (Fig. 1). perezfar- Type Species.-Troglomexicanus fantae (Villalobos, 1971). Etymology.-The genus name is derived from Greek troglo (dwelling in a cave) and Mexican, since the new genus is distributed only in Mexican caves. Troglomexicanus perezfarfantae (Villalobos, 197 1) Troglocubanus perez&arfantae Villalobos, : 1; Strenth, 1976: 13; Hobbs et al., 1977: 64; Holthuis, 1977: 181; Mitchell et al., 1977: 49; Reddell, 1981: 16; Villalobos, 1982: 218; Holthuis, 1986: 607; Villalobos et al., 1993: 281; Alvarez et a[., 1996: 110. Diagnosis.-Carapace, eyes, mandible, maxilla, and first maxilliped same as in description of genus. Rostrum short, not reaching distal end of first antennular segment, curving upward. Hepatic and branchial grooves of carapace visible. Abdomen smooth, sornites 1-5 with rounded pleura, pleura of sixth somite with posterior portion falcate. Telson shorter than external branch of uropods, longer than internal branch, posterior margin rounded, bearing 3 or 4 spines laterally and 2 pairs on distolateral angles, external pair longer. Antennular peduncle shorter than antenna1 scale, stylocerite short and blunt with deep dorsolateral groove on first article. External flagellum divided into 2 rami from fourth or fifth basal segment onward; internal ramus short with segments. Antenna with antennal flagellum 3 times as long as total length of shrimp. Antenna1 scaphocerite reaching beyond antennular peduncle. First pair of pereiopods shorter than second pair. Ischium short, distal portion wider, bearing setae on internal margin. Merus longer than carpus. Second pair of pereiopods subequal, slender, longer than total length of shrimp. Surface of chela smooth with scattered setae, movable finger two-thirds length of cheliped, cutting edges of fingers smooth, without teeth. Carpus 2.5 times length of palm and longer than merus. Remaining 3 pairs of pereiopods increasing in length posteriorly. Second pair of pleopods with an appendix interna more than half length of endopod. Uropods with external ramus longer than internal one. Exopod bearing 2 spines on laterodistal angle. Endopod as long as telson. Distribution.-Known only from the type locality, S6tano de Tinaja (22"04'N, 89"56'W), 11.7 km east northeast from Ciudad Valles, San Luis Potosi, Mexico. Remarks.-The single known specimen of this species, a female (USNM ) was collected by J. Fish and D. McKenzie in a large lake, 107 m long and 9 m wide, with a temperature of 22S C, near the deepest section of the cave (Mitchell et al., 1977). Although Sotano de Tinaja has been explored Since 1946, and several expeditions have entered to collect blind fish, the holotype remains the only known specimen of the species, Troglomexicanus tamaulipasensis, new species Figs. 2, 3 Ho1otype.-5, cl 5.6 mm, tl 17.0 mm; 10 March 1997; Cueva del Nacimiento del Rio Frio (23"01fN, 99"04'W), Municipio de G6mez Farias, Tamaulipas; collected by T. M. Iliffe and D. A. Hendrickson; CNCR A1lotype.-c, cl 8.1 mm, tl 22.0 mm; same date, locality, and collectors as holotype; CNCR Paratypes.--4 xi, cl 5.0, 7.1, 7.5, 7.7 mm, tl 15.5, 21.0, 21.0, 21.5 mm; 3 I?, cl 5.5, 7.5, 8.2 mm, tl 16.8, 21.5, 23.0 mm; same date, locality, and collectors as holotype; CNCR Description.-Rostrum slender, short, unarmed dorsally or ventrally, proximal half straight, distal half curving downward, ending in sharp tip, reaching slightly beyond ocular peduncles and proximal third of first antennular segment. Carapace smooth, with shallow hepatic depression and without antennal branchiostegal, or hepatic spines (Fig. 2a). Carapace with anterior margin projected next to rostrum, partially covering ocular pe-

4 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 19, NO. 1,1999 Fig. 2. Troglomexicanus tamaulipasensis, new species, male holotype: a, body, lateral view; b, mandible; c, maxillule; d, maxilla; e, first maxilliped; f, second maxilliped; g, third maxilliped. All scale bars indicate 1 mm.

5 VILLALOBOS ETAL: NEW SPECIES OF TROGLOBITIC SHRIMPS Fig. 3. Troglomexicanus tamaulipasensis, new species, male holotype (except g): a, dorsal view of anterior portion of carapace; b, antennule; c, antenna and antenna1 scale; d, first pereiopod; e, second pereiopod; f, dorsal view of telson and uropods; g, second pleopod of female; h, second pleopod of male; i, appendix masculina. All scale bars indicate 1 mm. duncles; anterolateral margin rounded at inferior orbital angle; posterior margin formed laterally by broadly rounded expansion overlapping with first abdominal somite. Eyes reduced, without cornea. Abdomen smooth. Anterior margin of pleura of first somite overlapping carapace. Second somite with pleura broadly rounded and with shallow depression along inferior border. Somites 3-5 with posterolateral mar- gin of pleura rounded (Fig. 2a). Sixth somite slightly longer than second, dorsally projecting on top of anterior portion of telson, with rounded notch on posterolateral margin of pleura at articulation of uropod. Telson shorter than internal pair of uropods; with 2 pairs of small, articulated spines on dorsal surface next to lateral margin. Posterior pair next to posterior margin, anterior pair next to posterior one on distal fifth of length of

6 116 JOURNAL OF CRLISTACE.AN BIOLOGY. VOI NO. I telson. Posterior margin rounded, bearing 14 long, plumose setae, with 2 spines on each posterolateral angle, external one shortest (Fig. 3f). Antennular peduncle shorter than antenna1 scale (Fig. 3a). Stylocerite strong, with subacute apex reaching distal fourth of first antennular segment. First antennular segment flattened and twice as long as second. Second segment with rounded, deep notch on anterior margin; external flagellum divided into 2 rami from fourth basal segment onward, short ramus with 16 segments (Fig. 3b). Antenna with scaphocerite reaching beyond antennular peduncle, twice as long as broad, with lateral margin ending distally in small acute spine, not reaching distal margin. Mandible without palp, elongate molar process, incisor process with 3 conical teeth (Fig. 2b). Maxillule with bilobed palp: distal lobe slender with 4 long setae, 2 anterior, 2 on apex; proximal lobe strong, with cylindrical projection on posterior margin; anterior lacinia with mesial margin armed with sharp setae; posterior lacinia arched with fine setae along anterior and posterior margins (Fig. 2c). Maxilla with scaphognathite bearing plumose setae, anterior lobe slender, thinner than posterior one; palp strong, decreasing in thickness distally, ending in tip devoid of setae; endite single-lobed and slim, with distal end rounded and bearing plumose setae (Fig. 2d). First maxilliped with 3 endites bearing marginal and submarginal setae (Fig. 2e). Exopod slender, 4 times length of palp, distal third bearing long setae; caridean lobe obvious, joined to basal portion of exopod, with long setae along margins; palp strong proximally, decreasing in thickness distally, with long seta on mesial margin. Epipodite composed of 2 lobes, approximately rounded, separated by deep notch as long as epipodite; anterior lobe wider than posterior one. Second maxilliped subpediform and without podobranch, endopod 4-segmented, 2 distal articles with gnathal border armed with spines and setae; exopod slender, almost twice as long as endopod; epipodite singlelobed, slender, and simple (Fig. 2f). Third maxilliped pediform, thin, with distal segment reaching beyond scaphocerite. Well-developed arthrobranch present, coxa with flattened, chitinous, rounded protuberance. Basis short. endopod and exopod joined to basis at distal margin. Endopod 3-segmented, bearing tufts of setae, becoming denser distally; first segment thin, 1.3 times length of second segment; third segment ending in rounded tip, shorter than second segment. Exopod slender, slightly longer than first segment of endopod; distal third bearing long setae (Fig. 2g). First pair of pereiopods slender, shorter than second pair; carpus reaching beyond distal end of scaphocerite, longer in males than in females. Ischium short, less than half of merus length, about half length of carpus and chela; proximal half of ventral border bearing wide notch; tufts of setae on distal half. Merus longer than carpus and chela, dorsal and ventral margins parallel, with tuft of setae ventrally on proximal half. Proximal twothirds of carpus slender, becoming wider distally, of about same length as chela, with scattered setae dorsally and distal tuft of setae ventrally. Chela slightly thicker than distal portion of carpus; palm three-fourths length of fingers, with ventral tuft of setae on proximal portion. Fingers slender, straight, leaving small gap when closed, with tufts of setae becoming denser distally. Cutting edges of fingers chitinized, devoid of teeth. Tips of fingers sharp, corneous, with tuft of setae (Fig. 3d). Second pair of pereiopods subequal, elongate, devoid of setae except for 1 tuft on tip of each finger; distal third of merus reaching beyond scaphocerite. Length ratios of segments as follows. Ischium shortest, times length of merus, times length of carpus, and times length of dactyl. Merus shorter than carpus and of same length as dactyl. Carpus of same length as dactyl or slightly longer. Chela longer than carpus, times its length; palm slightly thicker than carpus, about half length of dactyl. Fingers thin, elongate, with sharp corneous tips; cutting edges devoid of teeth, closing completely (Fig. 3e). Remaining pereiopods thin, increasing in length from third to fifth pair; smooth with sparse short setae near articulations of segments, along posterior margin of propodus, and on middorsal portion of dactyl. In all pairs, dactyl being shortest segment, simple, ending in sharp tip. Third pair of pereiopods with distal margin of carpus reaching beyond scaphocerite. Ischium slightly more than half length of merus

7 VILLALOBOS ETAL.: NEW SPECIES OF TROGLOBITIC SHRIMPS 117 and propodus, shorter than carpus, and longer than dactyl. Merus 1.5 times length of carpus, 3 times length of dactyl, and about same length as propodus. Carpus shorter than propodus and twice length of dactyl. Propodus 3 times length of dactyl. Fourth pair of pereiopods with distal third of carpus reaching beyond scaphocerite. Ischium about half length of merus and propodus, shorter than carpus, and longer than dactyl. Merus 1.5 times length of carpus and 3 times that of dactyl, about same length as propodus. Carpus shorter than propodus and twice length of dactyl. Propodus 3 or more times length of dactyl. Fifth pair of pereiopods with distal third of carpus reaching beyond scaphocerite. Ischium slightly less than half length of merus and propodus, shorter than carpus, and twice length of dactyl. Merus 1.3 times length of carpus, 3 times length of dactyl, and slightly shorter than propodus. Carpus shorter than propodus, more than twice length of dactyl. Propodus 4 times length of dactyl. Pleopods with well-developed rami, except for first pair in both sexes where endopod reduced, without appendix interna (Fig. 3g). In male, second pair with appendix masculina slender, long, reaching distal third of endopod; bearing setae distally, 4 located on apex; appendix interna, slim, shorter than appendix masculina (Fig. 3h, i). Uropods with both rami of subequal length, reaching beyond tip of telson with distal fourth. Protopod with external lobe ending in acute spine and medial lobe rounded. Endopod bearing setae on posterior margin and on distal portion of lateral margins, posterior margin rounded. Exopod with straight external lateral margin ending in unmovable spine, with small, movable, sharp spine next to it on mesial margin. Diaeresis incomplete, appearing as border reaching middle of exopod surface; posterior margin broadly rounded, bearing setae (Fig. 3f). Etymology.-The specific name is derived from Tamaulipas, the State where the species occurs. Distribution.-Known cality. only from the type lo- Remarks.-Troglomexicanus tamaulipasensis seems to be more closely related to 7: huastecue, new species, described below, than to 7: perez$arfantae. From the former, it differs in having a slimmer body and rostrum, a rounded posterior margin of the telson, and the rami of the uropods of subequal length. The new species can be readily separated from 7: peredarfantae by its shorter rostrum, the telson shorter than uropods, with two pairs of lateral spines and rounded posterior margin. Troglomexicanus huastecae, new species Figs. 4, 5 Holot)?pe.--. cl 8.0 mm, tl 21.0 mm: 13 March 1997: Manantial de San Rafael de 10s Castro (22"46'N, 99"03'W), Municipio de Ciudad Mante, San Luis Potosi; collected by T. M. lliffe and D. A. Hendrickson; CNCR 1703 I. Description.-Rostrum short, sharp, slightly oriented upward, reaching beyond distal margin of ocular peduncles and proximal third of first segment of antennular peduncles; dorsal and ventral margins devoid of teeth. Carapace smooth, without antennal, branchiostegal, or hepatic spines; with shallow branchiostegal depression (Fig. 4a). Anterior portion of carapace produced next to rostrum, partially covering ocular peduncles; anterolateral margin with inferior orbital angle slightly marked by smooth, rounded projection. Posterolateral margin of carapace ending in broadly rounded section overlapping first abdominal somite. Eyes reduced, ocular peduncles partially exposed, cornea absent. Surface of abdomen smooth. Anterolateral margin of pleura of first somite overlapping posterior margin of carapace. Second somite with pleura broadly rounded, with shallow depression on middle section of inferior margin. Third to fifth somite with posterolateral angle of pleura rounded and projected posteriorly (Fig. 4a). Sixth somite as long as second somite, with rounded notch on posterolateral margin of pleura at articulation of uropod, angles limiting rounded notch subacute; dorsal posterior margin slightly projected on top of anterior portion of telson. Telson shorter than internal rami of uropods, 2 small, movable pairs of sharp spines dorsally along lateral margin; first pair at approximately four-fifths length of telson, second pair smaller, next to posterior margin. Posterior margin of telson almost straight, with 14 long, plumose setae, and with pair of spines on each posterolateral angle, external one smaller. Antennular peduncle shorter than antennal scale; stylocerite strong, apex subacute, reach-

8 JOURNAL OF CRUSTACEAN BIOLOGY, VOL. 19, NO. 1,1999 Fig. 4. Troglornexicanus huastecae, new species, female holotype: a, body, lateral view; b, mandible; c, maxillule; d, maxilla; e, first maxilliped; f, second maxilliped; g, third maxilliped. All scale bars indicate 1 mm.

9 VILLALOBOS ETAL: NEW SPECIES OF TROGLOBITIC SHRIMPS 119 Fig. 5. Troglomexicanus huastecae, new species, female holotype: a, antennule; b, antenna and antenna1 scale; c, first pereiopod; d, third pereiopod; e, fourth pereiopod; f, fifth pereiopod; g, detail of posterolateral angle of telson; h, dorsal view of telson and uropods; i, detail of spines on external margin of exopod. All scale bars indicate 1 mm. ing distal fourth of first peduncular segment. Second segment with deep, rounded notch on anterior margin. External flagellum divided into 2 branches from fourth basal segment onward, short branch with 16 segments (Fig. 5a). Antennae with scaphocerite reaching beyond antennular peduncles with distal fourth, more than twice as wide as long, lateral margin ending in small sharp spine, not reaching distal margin (Fig. 5b). Mandibles without palp, with elongated molar process, incisor process ending in three conical teeth (Fig. 4b). Maxillules with bilobed palp; distal lobe slender, anterior margin smooth, bearing 2 long apical setae; proximal lobe strong, with 2 small, rounded protuberances along posterior margin, oriented in opposite directions; mesial margin of anterior lacinia armed with sharp teeth; posterior lacinia curved, bearing

10 120 JOURNAL OF CRGSTACLAN BIOLOGY. VOL. 19, NO. I. 1'199 thin setae along tip and anterior and posterior margins (Fig. 4c). Scaphognathite of maxillae with sinuous margin bearing plumose setae. anterior lobe thinner than posterior lobe; palp devoid of setae, proximal third strong, tapering distally, ending in rounded apex; endite single-lobed, apex rounded, bearing thin, plumose setae (Fig. 4d). First maxilliped with 3 endites bearing marginal and submarginal setae. Exopod slender, bearing long setae on distal third, 4 times as long as palp; caridean lobe well formed bearing long setae marginally, separated from basal portion of exopod by V-shaped cleft. Palp moderately flattened, strong, mesial margin straight with long, thin subapical seta, lateral margin curving toward mesial margin distally, forming sharp tip. Epipodite formed by 2 strong, broadly rounded lobes, separated by deep cleft as long as half length of epipodite; anterior lobe wider than posterior one (Fig. 4e). Second maxilliped subpediform and without podobranch, endopod 4-segmented, 2 distal articles oriented mesially with gnathal border bearing setae and spines. Exopod slender, distal half reaching beyond margin of endopod, bearing long setae distally. Epipodite single-lobed, with borders smooth (Fig. 4f). Third maxilliped pediform, strong, distal segment reaching beyond scaphocerite; welldeveloped arthrobranch basally. Coxa simple, bearing flattened, chitinous, rounded protuberance. Basis short, endopod and exopod joined to basis at distal margin. Endopod with 3 segments bearing tufts of setae, becoming denser distally; first segment 1.4 times length of second segment, third segment shorter than second segment, ending in rounded tip. Exopod slender, longer than first segment of endopod, distal third bearing long setae (Fig. 4g). First pair of pereiopods slender and shorter than second pair. Ischium short, slightly more than half length of merus, carpus, and chela; ventral border with wide proximal notch and tufts of setae along distal half. Merus slightly longer than carpus and chela, dorsal and ventral margins parallel, tuft of setae on proximoventral margin. Proximal two-thirds of carpus slender, becoming wider distally, as long as chela, scattered setae on dorsal margin, and tuft of setae on distoventral margin. Chela thicker than distal portion of carpus, palm shorter, about half length of fingers, with proximoventral tuft of setae. Fingers slender, straight, with scattered setae becoming denser distally; leaving narrow space when closed, cutting borders smooth without teeth, tips corneous, with tuft of setae (Fig. 5c). Second pair of pereiopods subequal, long, slender, with scattered setae; reaching beyond distal margin of scaphocerite with distal third of merus. Length ratios of segments as follows. Ischium shortest, 0.76 times length of merus, 0.63 times length of carpus, and 0.72 times length of dactyl. Merus shorter than carpus (0.8) and slightly shorter than dactyl (0.95). Carpus longer than dactyl (1.14). Chela 1.4 times length of carpus; palm slightly thicker than carpus, more than half length of dactyl. Fingers thin, elongate, with sharp, corneous tips; cutting edges devoid of teeth, closing completely (Fig. 4a). Remaining pereiopods slender, increasing in length from third to fifth pair; smooth with sparse short setae near articulations of segments, along posterior margin of propodus, and on mid-dorsal portion of dactyl. In all pairs, dactyl shortest segment, simple, ending in sharp tip. Third pair of pereiopods with ischium more than half length of merus and propodus, 0.9 times length of carpus, 1.75 times length of dactyl. Merus 1.5 times length of carpus, 3 times as long as dactyl, and of about same size as propodus. Carpus shorter than propodus and twice length of dactyl. Propodus 3 times length of dactyl (Fig. 5d). Fourth pair of pereiopods with ischium more than half length of merus, shorter than carpus, half length of propodus, and 1.6 times length of dactyl. Merus 1.5 times length of carpus, 2.7 times length of dactyl, and slightly shorter than propodus. Carpus shorter than propodus and about twice length of dactyl. Propodus 3.2 times length of dactyl (Fig. 5e). Fifth pair of pereiopods with ischium more than half length of merus, shorter than carpus and propodus, and 1.6 times length of dactyl. Merus 1.3 times length of carpus and 2.8 times length of dactyl, shorter than propodus. Carpus more than half length of propodus and more than twice length of dactyl. Propodus 3.8 times length of dactyl (Fig. 5f). Pleopods with well-developed rami, except for first pair where endopod reduced without appendix interna. Uropods with internal branch slightly shorter than external one, reaching beyond

11 VILLALOBOS ETAL.: NEW SPECIES OF TROGLOBITIC SHRIMPS 121 distal margin of telson with distal fourth. Pro- coastal plain of the Gulf of Mexico, through topod with external lobe forming sharp spine the border of the states of Tamaulipas and San and internal lobe rounded. Endopod with se- Luis Potosi (Fig. 1). In the area, more than 40 tae along posterior margin and distal portion caves have been registered so far, of which of lateral margins, posterior margin rounded. 27 are inhabited by cavernicolous fishes of Exopod with lateral margin straight, ending the genus Astyanax (see Mitchell et al., distally in unmovable spine, with internally 1977). The presence of blind fishes, the small, sharp, movable spine; diaeresis incom- recording of permanent bodies of water, and plete, appearing as border reaching middle of the availability of large quantities of organic dorsal surface of exopod; posterior margin matter inside the caves, suggest that it is broadly rounded, bearing setae (Fig. 5h). likely that more new species of decapod crustaceans will be found. In the case of Troglomexicanus, S6tano de Tinaja (22"05'N, Etymology.-The specific name is derived from Huasteca, the name used for this region 89"56'W), the type locality of I: perezfalfantae, is located 75 and 102 km south from the of Mexico. Remarks.-Troglomexicanus huastecae seems type localities of i? huastecae and T. tamaulipasensis, respectively, on the western slope to be more closely related to T. tamaulipasensis than to 7: perezlfalfantae, as discussed in the southern tip of El Abra limestone (Fig. above. However, the three species are very l), leaving an extensive area unexplored for similar. The caves in which 7: huastecae and crustaceans. T. tamaulipasensis were collected are closer Troglomexicanus is clearly related to Troglocubanus. However, following the ideas of to each other (27 km) than to S6tano de Tinaja, the type locality of i? perezlfalfantae, Villalobos (1971) and Hobbs et al. (1977), the 75 and 102 km to the south. separation of the ancestral marine stock that invaded fresh water to become the Antillean KEY TO THE SPECIESOF TROGLOMEXICANUS and Mexican branches must have taken place 1. Telson longer than internal branch of uropods...troglomexicanus perezfa$antae - Telson shorter than internal branch of uropods 2 2. Posterior margin of telson rounded Troglomexicanus tamaulipensis - Posterior margin of telson straight......troglomexicanus huastecae D~scuss~o~ Villalobos (1971), in the description of Troglocubanus perezlfalfantae, stated that the Mexican species of Troglocubanus differed from the Antillean species in three characters: the absence of spines on the carapace, the endite of the maxilla single-lobed, and the epipodite of the first maxilliped bilobed. Hobbs et al. (1 977) figured and presented diagnosis of the six species that belonged to Troglocubanus, recording again the noticeable differences between the Antillean and the Mexican species. In this study, based on these three characters. not shared by any other genus of fresh-water shrimp of the subfamily Palaemoninae, the genus Troglomexicanus is proposed. The species of Troglomexicanuscome from caves that have formed in the limestone of Sierra de El Abra, a small mountain range that runs along a north-south axis in the very early in the evolution of the group. Chace and Hobbs (1969) postulated a Miocene origin for the Antillean species through separate invasions of Cuba and Jamaica. Villalobos (1971) proposed a Cretaceous origin for the Mexican stock, coinciding with the probable time of uplifting of the coastal area from which the El Abra limestone originates (Mitchell et al., 1977). The different postulated times at which invasions of the freshwater habitat may have taken place would suggest an older age for the Mexican stock. Under this scheme, the very specialized mouthparts of Troglomexicanus would be a consequence of a longer period of isolation. As pointed out by Chace and Hobbs (1969) and recognized by other authors, no epigean species closely related to Troglocubanus, and now to Troglomexicanus, can be identified, making the establishment of relationships of these two genera a difficult task. Collection of the shrimp described here was part of the March 1997 Blindcat Collecting Expedition led by Dr. Dean A. Hendrickson. Major funding for the expedition was supplied by U.S.-Mexico Foundation for Science (Project 54-E-94). Specimens were collected under SE- MARNAP permit 3120 (29 August 1996) issued to Dr. Hendrickson. We thank DiveRite Manufacturing, Inc., and

12 122 JOURNAL OF CRUSTACEAN BIOLOGY. VOL. 19, NO U.S. Divers Co., lnc., for supplying diving equipment used during the expedition and the Texas Memorial Museum for general support. We are especially grateful to Rolando Mendoza for the drawings. Members of the expedition included Dean A. Hendrickson, James C. Brown, Thomas M. Iliffe, Thomas L. Morris, Jean Krejca, Doug Feakes, Hector Espinosa Perez, Francisco Javier Garcia de Leon, Tania Flores Martinez, Jost Manuel Padilla Gutitrrez, Juan Manuel Rodriguez Martinez, and Harris W. Martin. This is contribution number 82 of the Texas Memorial Museum, University of Texas at Austin, 2400 Trinity, Austin, Texas Alvarez, F., J. L. Villalobos, and E. Lira Decipodos.-In: J. Llorente, A. Garcia-Aldrete, and E. Gonzilez, eds., Biodiversidad, taxonomia y biogeografia de artr6podos de MCxico: hacia una sintesis de su conocimiento. Instituto de Biologia, Universidad Nacional Aut6noma de Mtxico, pp Chace, Jr., F. A Two new blind prawns from Cuba with a synopsis of the subterranean Caridea of America.-Proceedings of the New England Zoological Club 22: ,and H. H. Hobbs, Jr The freshwater and terrestrial decapod crustaceans of the West Indies with special reference to Dominica.-United States National Museum Bulletin 292: Hay, W. P On a small collection of crustaceans from the island of Cuba.-Proceedings of the United States National Museum 26: Hobbs, Jr., H. H., H. H. Hobbs 111, and M. A. Daniel A review of the troglobitic decapod crustaceans of the Americas,-Smithsonian Contributions to Zoology 244: Holthuis, L. B Note on the species of Palaemonetes (Crustacea: Decapoda) found in the United States of America.-Proceedings, Koninklijke Nederlandse Akademie van Wetenschappen 52: Two new species of fresh-water shrimp (Crustacea: Decapoda) from the West Indies.-Proceedings, Koninklijke Nederlandse Akademie van Wetenschappen 66: Subterranean fauna of Mexico.-Accademia Nazionale dei Lincei Quaderno 171 : Decapoda.-In: L. Botosaneanu, ed.. Stygofauna mundi. Pp E. J. Brill, Leiden, The Netherlands. Mitchell, R. W., W. H. Russell, and W. R. Elliot Mexican eyeless characin fishes, genus Astyanax: environment, distribution, and evolution.-the Museum, Special Publications No. 12, pp Texas Tech University, Lubbock, Texas. Rathbun, M. J Some Cuban Crustacea, with notes on the Astacidae, by Walter Faxon, and a list of the Isopoda, by Harriet Richardson.-Bulletin of the Museum of Comparative Zoology 54: Reddell. J. R A review of the cavernicole fauna of Mexico, Guatemala, and Belize.-Texas Memorial Museum Bulletin 27: Strenth, E. N A review of the systematics and zoogeography of the freshwater species of Palaenzonetes Heller (Crustacea: Decapoda) of North America.-Smithsonian Contributions to Zoology 228: Villalobos, A, Una nueva especie de Troglocubanus (Crustacea: Decapoda: Palaemonidae), de San Luis Potosi, MCxico.-Anales del Instituto de Biologia, Universidad Nacional Aut6noma de MCxico, Serie Ciencias del Mar y Limnologia 42: Decapoda.-In: S. H. Hurlbert and A. Villalobos, eds., Aquatic biota of Mexico, Central America, and the West Indies. Pp San Diego State University. San Diego, California. Villalobos, J. L.. A. Cantti. and E. Lira Los crustaceos de agua dulce de Mtxico.-Revista de la Sociedad Mexicana de Historia Natural, Volumen Especial (XLIV): RECEIVED: 10 December 1997 ACCEFTED: 19 May Addresses: (JLV, FA) Colecci6n Nacional de Crusticeos, Instituto de Biologia, Universidad Nacional Aut6- noma de MCxico, Apartado Postal , MCxico D.F., MCxico. ( (TI) Department of Marine Biology, Texas A&M University at Galveston, Galveston, Texas , U.S.A.

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