RECORDS OF INTERTIDAL AMPHIPODS FROM THE SOUTHWEST ATLANTIC, WITH THE DESCRIPTION OF A NEW SPECIES OF ELASMOPUS Gloria M. Alonso de Pina A B S T R A C T One new species and 3 well-known species are reported from marine warm temperate waters in Argentina. Elasmopus marplatensis, new species, is described and fully illustrated, and its relationships with other species of the genus are discussed. Corophium insidiosum Crawford is a new record for the area and is partially illustrated. The presence of Melita palmata (Montagu) and Ampithoe valida Smith is confirmed and both are figured in part. In addition, biogeographical considerations for the Southern Ocean are discussed. This paper deals with intertidal amphipod species, basically algal dwellers, inhabiting coastal warm temperate waters in the southwest Atlantic. Elasmopus marplatertsis, a new melitid species, is described and figured from the Buenos Aires littoral. Corophiurrt insidiosum Crawford, 1937 (Corophiidae), partially illustrated herein, is reported for the first time in Argentina for Buenos Aires province and is the only one of the present group that occurs in a mesohaline habitat. The presence of Melita palmata (Montagu, 1804) (Melitidae) and Ampithoe valida Smith, 1873 (Ampithoidae) is confirmed. These species were reported previously (Alonso, 1986) from some of the localities mentioned in this contribution, but no figures accompanied those records. De Broyer and Jar dry ewski (1993) did not include these taxa in their amphipod checklist of the Southern Ocean, since neither of them belong to the Magellanic fauna, having been recorded only as far south as the base of the Peninsula Valdes (Alonso, 1986), the northern limit considered by those authors. De Broyer and JaP d ewski (1993) pointed out that identification of both species required confirmation. Therefore, illustrations of diagnostic characters are added here to clarify the status of the entities concerned and to aid identification of these characteristic species. Elasmopus marplatensis, new species Figs. 1-6 Material Examined.-Buenos Aires province: Mar del Plata, Bristol Beach (38 03'17"S, 57 31'18"W), March 1992; holotype d 6.5 mm, number 33953; allotype ovigerous 9 approximately 7.0 mm, number 33954; 4 paratypes, 1 9 with setose oostegites 6.2 mm, number 33955, 1 6 6.0 mm, number 33956, 2 66 damaged, number 33957. Material collected and donated by Marcelo Lucero. The material studied is deposited in the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia." Description.-Holotype, male with genital papillae; length 6.5 mm. Dorsal region of body segments with sparse short setae. Head with lateral cephalic lobes obtuse, limited ventrally by deep notch; eyes medium in size, nearly round, brownish red in alcohol. Antenna 1 elongate, peduncle longer than flagellum, peduncle article 1 about as long as article 2, article 3 0.53 times as long as article 2; flagellum with 22 articles, last one very small; accessory flagellum as long as article 1 of flagellum, 3-articulate, article 3 minute. Antenna 2 subequal to peduncle of antenna 1; flagellum shorter than peduncle, setose, with 9 articles, terminal article very small. Upper lip distally rounded, fringed with fine setae. Mandibles, right and left incisors with 3 teeth; right lacinia mobilis bifid with one branch simple and other multidentate, left lacinia mobilis with 5 teeth; right and left rakers with 3 and 4 spines, respectively; molar triturative, with plumose seta; palp article 2 0.93 times as long as article 3, with some unequal alternating submarginal B2- and D2- setae on proximal half and 4 long submarginal B2-setae located distally, article 3 falcate bearing 3 E3-setae and many D3-setae forming comb on concave margin. Lower lip with inner lobes, outer lobes with cone. Maxilla 1, inner plate with 2 apical long plumose setae and 3 apicolateral short setae; outer plate with 7 spines; palp article 2 distally setose. Maxilla 2, outer plate broader than inner, both apically setose; outer plate with fine apicolateral setae; inner plate with 2 long apico-
Fig. 1. Elasmopus marplatensis, new species. Male (holotype): a, lateral view; b, antenna 1; c, accessory flagellum; d, antenna 2; e, upper lip; f, g, right and left mandibles; h, mandibular palp; i, lower lip; j, maxilla 1; k, outer plate of maxilla 1; 1, maxilla 2; m, inner and outer plates of maxilliped. Scales: A, for a; B, for b, d; C, for c, e-m.
Fig. 2. Elasmopus marplatensis, new species. Male (holotype): a, palp of maxilliped; b, gnathopod 1; c, propodus of gnathopod 1; d, gnathopod 2; e, propodus of gnathopod 2; f, g, pereiopods 3 and 4. Male (paratype): h, propodus of gnathopod 2. Scales: A, for a, c, e; B, for b, d, f-h.
medial plumose setae, inner margin fringed with fine setae, outer margin bearing fine apicomedial setae. Maxilliped, inner plate about 0.4 times as long as outer plate, with apical plumose setae and approximately 6 medial marginal plumose setae; outer plate reaching about half-way along palp article 2, bearing apicolateral plumose setae and stout graded medial spines; palp article 3 with rounded lobe at articulation with article 4; dactylus slightly shorter than article 3, provided with distinctive, long nail bearing 2 setules. Gnathopod 1 smaller than gnathopod 2, coxa almost as long as wide, anteroventral corner rounded and somewhat produced, anterior margin slightly concave, ventral margin with 3 or 4 long setae; carpus, posterior margin rounded, setose, with submarginal pectinate setae and other setae arising medially, anterior margin about 1.7 times as long as posterior margin; propodus about 1.2 times longer than carpus, subrectangular, anterior margin longer than posterior margin bearing sets of submarginal setae along distal part, posterior margin with inferior medial setae arranged in groups and long marginal setae and 1 spine located on distal third of margin, palm oblique with groups of long setae and small spines, defined by 1 stouter and 2 shorter spines at palmar angle; dactylus extending length of palm, posterior margin setulose. Gnathopod 2 robust, coxa subrectangular, longer than wide, almost parallel sided, ventral margin with 3 long setae; basis stout, subequal in length to coxa; carpus compressed, posterior margin forming lobe, with numerous long and short setae; propodus oval, elongate, anterior margin longer than posterior margin, bearing sets of submarginal setae along distal three-quarters, posterior margin about as long as palm with groups of long setae, palm oblique with few long setae and short spines, defined by 2 unequal stout spines, inner face with obscure spinose longitudinal ridge; dactylus reaching palmar angle, with inner margin setulose. Pereiopod 3, coxa rectangular, ventral margin with few long setae; basis elongate; propodus with about 7 posterior sets of spines. Pereiopod 4 shorter than 3, similar in shape and proportions, except coxa with anterior margin convex, ventral margin rounded with a few long setae, posterior margin excavate. Pereiopods 5-7 relatively longer and stouter; coxae 5 and 6 with 2 posteroventral spines and several short setae, these setae also present on coxa 7; basis, anterior margin bearing small spines, single or paired, posterior margin crenellate, each shallow crenellation with short seta and few spaced long setae; merus, anterior margin extended distally over carpus; carpus distally spinose; propodus, anterior margin bearing spines arranged in groups, posterior margin armed with 1 group of medial spines on pereiopod 6 and 2 groups on pereiopod 7. Pereiopods 3-7 each with distal pair of simple unequal locking spines; dactylus, inner margin smooth, apically constricted, bearing 1 seta and 2 setules at constriction. Gills broad, present on coxae 2-6. Epimera 1 and 2, posteroventral corner with small tooth, posterior margin convex bearing 2 or 3 setules, ventral margin medially with 2 groups of short spines. Epimeron 3, posterior margin straight, bearing 3 sharp teeth and proximal notch next to these. Each tooth armed with setule except ventralmost, posteroventral tooth as long as others, ventral margin bearing 3 pairs of spines and 2 single spines anteriorly, 1 spine of most posterior pair comparatively long. Uropod 1 longest, peduncle longer than rami. Uropod 2, peduncle shorter than rami. Uropods 1 and 2, inner ramus shorter than outer ramus, rami ordinarily spinose, with long terminal spines. Uropod 3 shortest, enlarged, peduncle shorter than outer ramus, distal margin with spines; outer ramus apically spinose, outer margin bearing 2 groups of unequal spines on distal half; inner ramus scarcely shorter, about 0.8 times as long as outer ramus, apically spinose, outer margin with small spine on proximal part. Telson as wide as long, cleft 70%, lobes apicolaterally excavate, each excavation with 1 long and 1 short spine. Paratypes, 2 damaged males larger than holotype; gnathopod 2, palm inner face with more pronounced ridge, palmar margin somewhat excavate proximally and with slight protrusion distally, spines proportionally smaller than in holotype. Allotype, ovigerous female, 7.0 mm; similar to holotype but antenna 2 elongate, slender, flagellum equiarticulate but longer than male; gnathopod 1, coxa slightly longer than wide, basis relatively longer; gnathopod 2, basis longer, carpus not compressed, larger, with posterior margin longer and less rounded, propodus elongate, anterior and posterior margins with tufts of medial setae, palm bear-
Fig. 3. Elasmopu.s marplatensis, new species. Male (holotype): a-c, pereiopods 5-7; d-h, dactylus of pereiopods 3-7; i, j, epimera I and 2. Scales: A, for a-c; B, for d-j.
Fig. 4. Elasmopus marplatensis, new species. Male (holotype): a, epimeron 3; b-d, uropods 1-3; e, telson. ing numerous short closely sparse spines, palmar corner defined by larger spines; uropods 1-3 more spinose; uropod 3 inner ramus comparatively shorter than outer ramus; telson with 4 apical spines on one lobe and 3 apical spines on other, one spine almost as long as telson, other spines shorter, of different length, apices with inner margin distally more truncate. Fully developed oostegites elongate, narrow, marginally setose, attached to coxae 2-5.
Fig. 5. Ela.smopns marplatensis, new species. Female (allotype): a, antenna 2; b, gnathopod 1; c, propodus of gnathopod 1; d, gnathopod 2; e, propodus of gnathopod 2; f, oostegite. Scales: A, for a, b, d, f; B, for c, e.
Etymology.-The specific epithet marplatensis refers to the geographical locality (Mar del Plata) where the material was found. Remarks.-The new species, Elasmopus marplatensis, is separated from all other species known in the genus by the following combination of characters: (1) male gnathopod 2 without palmar process or tubercle, (2) serrate epimeron 3, (3) uropod 3, and (4) telson. It differs from species such as E. levis (Smith, 1873), E. spinimanus Walker, 1904, E. magnispinatus Kunkel, 1910, and E. spinipes Mateus and Mateus, 1986, in the following characters: the serrate epimeron 3 which has a smooth posterior margin in these species; uropod 3 which presents both rami longer than the peduncle in E. levis, rami much longer than peduncle and not markedly different in length in E. spinimanus, and the general shape and spination in E. magnispinatus and E. spinipes; the telson, which is elongate in E. levis, the apex of each lobe acute and longer, armed with different number of spines in E. spinimanus, and dissimilar apical process of the lobes and number of spines in E. magnispinatus and E. spinipes. However, all these species mentioned above resemble the new species in the male gnathopod 2, particularly in the propodus palm without a special process or tubercle, being almost oblique. Elasmopus marplatensis resembles E. wahine Barnard, 1972, E. menurte Barnard, 1974, E. bampo Barnard, 1979, E. mayo Barnard, 1979, and E. tiburoni Barnard, 1979, in the shape of the telson and its terminal spination. This resemblance, however, is sometimes present in the male, sometimes only in the female, and occasionally in both sexes; otherwise, all these species are easily distinguished from the new species by the other features listed above in the following ways: gnathopod 2 in the male bears palmar processes or tubercles of variable nature; epimeron 3 is posteriorly smooth in E. wahine, weakly notched in E. menurte, differently serrate in E. bampo, and with 1 or 2 notches or completely notched but with smaller posteroventral tooth in E. mayo and E. tiburoni, respectively; uropod 3 has a different type of spination in males of E. wahine, the inner ramus is shorter and has a different number of spines in E. menurte, and the rami in the male are equal in length in the last 3 species. Other species allied with the taxon described here are: E. rapax Costa, 1853 (European material), E. pectenicrus (Bate, 1862), E. hooheno Barnard, 1970, E. molokai Barnard, 1970, and E. thoma.si Ortiz and Lalana, 1994. They share the serrate posterior margin of epimeron 3, but differ in having the male gnathopod 2 with a palmar process. Uropod 3 has both rami longer, bearing a different number of spines in E. rapax, the rami with shorter spines in E. pectenicrus, the inner ramus much shorter in E. hooheno and E. thomasi, and both rami shorter with different number of spines in E. molokai. The telson is longer bearing different number of apical spines in the first species, the lobe apices are straight and are armed with greater number of spines in the second species; these lobes are truncate in the third and fourth species; and, finally, the telsonic lobes are rounded in E. thomasi. Elasmopus marplatensis was found intertidally among epizoic Ulva rigida (C. Agardh) Thuret associated with the mytilid bivalve Brachidontes rodriguezi (d'orbigny) attached to rock in tidal pools on a populated urban beach in Mar del Plata. Corophium insidiosum Crawford, 1937 Fig. 6 Cornphium insidiosum Crawford, 1937: 615-616, fig. 2A-G. Corophium in.sidiosum: Shoemaker, 1947: 53, 56, figs. 6, 7; Barnard, 1970: 101-102, fig. 54; Bousfield, 1973: 203, pi. LXIII.L Lincoln, 1979: 530, fig. 254d-h; Myers, 1982: 191, fig. 128; Gonzalez, 1991: 52. Corophium cf. insidiosum: Bastida et al., 1980: 304, 310, 318, fig. 10. Material Examined.-Buenos Aires province: Bahia Samboromb6n, San Clemente del Tutu (36 21'S, 56 43"W), specimens in tubes attached to Bryozoa and filaments of algae, October 1994, 10 adult 99 2.25-4.0 mm, number 33958; 5 dd 1.75-3.0 mm, number 33959. Elena leno, collector and donator. Remarks.-The specimens agree with the descriptions and illustrations of Crawford, 1937, Bousfield, 1973, and Lincoln, 1979, but differ from those of Shoemaker, 1947, Barnard, 1970, and Myers, 1982. The last three authors reported up to 3 ventral spines on article 1 of the male antenna 1 in contrast to the single ventral spine found in the present material. This species is recorded for the first time from Argentina. It has been reported previously in South America from Chile (Gonzalez, 1991). Bastida et al. (1980) in their study
Fig. 6. Elasmopus marplatensis, new species. Female (allotype): a, telson; b, uropod 3. Corophium insidiosum. Male (approximately 3.0 mm): c, head: d, e, antennae 1 and 2; f, urosome. Female (approximately 4.0 mm): g, head; h, i, antennae I and 2. Scales: A, for a, b; B, for c-i.
of marine fouling communities at Mar del Plata harbor (Buenos Aires) identified material of Corophium comparable to C. insidiosum, observing, through the ecological succession, that it was the most abundant amphipod for the area studied. Corophium insidiosum is a widely distributed and transported species (Barnard, 1970). Its distribution, according to Barnard and Barnard (1990), appears to be marine cosmopolitan (especially in harbors), transferred by humans. Crawford (1937) discovered the species in many British localities where the environments consisted of estuaries, brackish pools, ditches, and piers. Later, other records expanded the geographical distribution of the species and confirmed its presence in shallow waters, commonly in brackish lagoons and near piers (Shoemaker, 1947; Bousfield, 1973; Lincoln, 1979; Myers, 1982). The present material colonized acrylic panels placed in a marsh from the southern sector of Bahia Samboromb6n, where the panels were attached to soft bottoms in the infralittoral zone of tidal channels. This environment is characterized by warm temperate waters, with a salinity ranging from 11-20%o (Bousfield, 1973, reported a fluctuation from estuarine to about 15%o) and a grain size of the bottom from fine to very fine sand. The artificial surfaces were colonized in approximately one month. Tubes of C. insidiosum were attached to bryozoans and filamentous algae (personal communication from the collector). Melita palmata (Montagu, 1804) Fig. 7 Cancer palmatu.s Montagu, 1804: 69. Melita palmata: Bate, 1862: 337-340, figs.; Sars, 1895: 508-509, pi. 179; Chevreux and Fage, 1925: 230-231, fig. 241; Lincoln, 1979: 298, figs. 137a, 139a-j; Alonso, 1986: 68; Ortiz, 1994: 124, 126. Material Examined.-Chubut province: Golfo San Jos6, Isla de los Pajaros (approximately 42 23'S, 64 38'W), 23 July 1980, 1 adult d 8.0 mm (illustrated), 1 ovigerous 9 6.5 mm, associated with Ulva rigida; Golfo Nuevo, Peninsula Valdes, Punta Pardelas (42 37'S, 64 16'W), 23 July 1980, 2 subadult 88 6.0 and 6.3 mm, 1 subadult 9 5.9 mm, associated with Ulva rigida, 1 immature 5.0 mm (illustrated), 1 adult 9 8.0 mm (illustrated), associated with Ceramium sp.lcorallina officinalis; Puerto Madryn (42 46'S, 65 02'W), El Doradillo beach (about 11 km north Puerto Madryn), 24 July 1980, 1 adult 9 6.25 mm, associated with Ulva rigida; beach about 15 km southeast of Puerto Madryn, 22 July 1980, 1 immature (1 5.0 mm, associated with Ceramium sp.lcorallina offici- nalis. The specimens are catalogued under the following numbers: 33960-33964. Remarks.-This species agrees with existing descriptions and illustrations in the literature. The characteristic male gnathopod 2 is dis- tinctive. A wide size range of males was examined and it was noted that immature or subadult examples have a more slender gnatho- pod 2 propodus as noted by Lincoln (1979). The smallest individuals examined here have this article similar to that of the female, but without the female spination, while larger specimens show gradual development of the expansion of the distal part of the propodus. Melita palmata was collected at the midlit- toral level. It was commonly associated with green and red algae, particularly Chloro- phyceae (Ulva rigida) and less frequently with the epiphyte Ceramium sp., supported by Corallina officinalis L. Melita paltnata is known also from Rio Negro province (Golfo San Matias) (Alonso, 1986). The salinity in these environments fluctuated between 30 and 32%c. Previously, it had been noted that this species tolerates a very wide range of salin- ity (Lincoln, 1979). Ampithoe valida Smith, 1873 Fig. 7 Arnphithoe [sic] valida Smith, 1873: 563. Ampithne valida: Conlan and Bousfield, 1982: 49-50, fig. 3; Alonso, 1986: 67. Material Examined. Buenos Aires province: Santa Clara del Mar (approximately 37 56'S, 58'11 W), 25 December 1995, 1 adult d and I adult 10.0 mm, associated with Polysiphonia sp.; Quequ6n, north of Costa Bonita beach (approximately 38 34'S, 58 38'W), 4 January 1990, 1 adult 8 9.0 mm, 2 immature 88 about 7.0 mm, 1 immature 5.0 mm, associated with Corallina officinali.s; Quequ6n, Punta Carballido (38'35'S, 58 42'VU), 7 February 1990, I adult ' 10.0 mm, I immature d 8.0 mm, I adult 9 12.0 mm, associated with Ulva rigida (collected by M. A. Lluch); Necochea, Punta Negra (approximately 38 37'S, 58 43'W), 8 January 1990, 1 adult 13.0 mm, associated with Enteromorpha cornpressa (L.) Grev.; Bahia Anegada (39 51'-40 35'S, 61 58'-62 28'W), December 1994, 1 adult d 12.0 mm (dissected), associated with algae (collected by E. P. Dos Santos and M. Borges). Rio Negro province: Golfo San Matias, La Loberfa (approximately 41'08'S, 63'08W), 2 January 1983, 1 adult d 9.0 mm, I immature a 8.0 mm, I adult 9 12.0 mm, associated with Cercemium sp.; 4 January 1982, 2 immature 88 7.0 and 8.0 mm, 1 adult V 7.0 mm, associated with green algae, I immature 6.0 mm, associated with Corallina officinali.s, I adult d 9.0 mm, 1 immature c1 6 mm, I adult Q 7.0 mm, associated with Ulva rigida; San Antonio Oeste, Las Grutas beach (approximately 40 45'S, 65 02'W), 3 January 1982, 1 immature c) 7.0 mm, 1 adult
Fig. 7. Melita palmata (Montagu, 1804). Male (immature, 5.0 mm): a, b, gnathopods 1 and 2. Male (adult, 8.0 mm): c, gnathopod 2. Female (8.0 mm): d, e, gnathopods 1 and 2; f, coxa and basis of pereiopod 6. Ampithoe valida Smith, 1873. Male (approximately 13.0 mm): g, h, gnathopods 1 and 2; i, epimeron 3. Female (13.0 mm): j, k, gnathopods 1 and 2. Scales: A, for a, b, d, e; B, for c, f; C, for g, h, j, k; D, for i.
9 10.0 mm, associated with Ulva rigid, 1 immature 6 and 1 immature about 5.0 mm, associated with Codium sp., I adult d and 1 adult 8.0 mm, associated with red algae. Chubut province: Golfo San Jose, Isla de los Pajaros (approximately 42 23'S, 64 38W), 23 July 1980, 2 adult 66 15.0 mm, I adult () 13.0 mm (illustrated), 1 adult 13.0 mm (illustrated), associated with Ulva rigida; Golfo Nuevo, Peninsula Valdes, Punta Pardelas (42'37'S, 64 16'W), 23 July 1980, 1 adult 11.Omm, I adult 9 10.0 mm, associated with Ulva rigida, 1 adult Q 13.0 mm, associated with Enteromorpha compressa, adult d 9.0 mm, associated with Ceramium sp.lcorallina officinalis, 3 adult 66 10.0 mm, 1 adult 11.0 mm, 1 adult 9 11.0 mm, associated with Polysiphonia sp.; Puerto Madryn (42 46'S, 65 02'W), El Doradillo beach (about 11 km north of Puerto Madryn), 24 July 1980, 1 immature 6 and 1 adult 9 9.0 mm, associated with Ulva rigida, I adult d 11.0 mm, 1 adult 9 10.0 mm, associated with Polysiphonia sp.; beach between El Doradillo and Puerto Madryn, 20 July 1980, 1 adult 11.0 mm, associated with Polysiphonia sp.; beach 3 km southeast of Puerto Madryn, 18 July 1980, 3 adult 11.0 mm, 1 adults 12.0 mm, associated with Polysiphonia sp.; beach about 15 km southeast of Puerto Madryn, 22 July 1980, 1 adult d 12.0 mm, 1 immature ô 8.0 mm, I adults 9.0 mm, associated with Ulva rigida, 1 juvenile 4.0 mm, associated with Codium sp., I adult d 10.0 mm, 1 adult ' 11.0 mm, associated with Ceramium sp.lcorallina officinali.s; Rawson, Magana beach (approximately 43 20'S, 65 04'W), 23 January 1982, 1 adult d 9.0 mm, 1 immature 8.0 mm, associated with Enteromorpha compressa, 2 adult dd 10.0 and 11.0 mm, 1 adult 9 12.0 mm, associated with Ulva rigida, 5 January 1983, 1 immature 6.0 mm, 1 adult 9 8.0 mm, associated with Chondria sp., 1 adult 9 9.0 mm, associated with Corallina officinalis. The specimens are catalogued under the following numbers: 33965-33992. Remarks.-All specimens examined from a wide latitudinal range agree closely with the descriptions and illustrations found in the lit- erature for Ampithoe valida. The males dis- play a gnathopod 2 with the propodus un- dergoing different grades of development ac- cording to the stage of maturity, with terminal males having a recognizable median quadrate projection at 5.0-6.0 mm body length. Males and females reach a maximum body length of about 14.0 and 15.0 mm, respectively (Alonso et al., in press). This intertidal species is very abundant in shallow rock pools located from the midlit- toral down to the infralittoral fringe. It occurs commonly in euryhaline waters among the thalli of green and red algae, most frequently associated with the chlorophyte Ulva rigida, sometimes with Enteromorpha compressa, occasionally with Polysiphonia sp., and more rarely with Chondria sp. and coralline algae. The present records extend the geographi- cal distribution of the species in Argentina along the coast of Buenos Aires province, in- dicating the preference of A. valida for warm temperate waters. Other records from the Southern Ocean referred to many north localities in the Pacific and Atlantic oceans. Contan and Bousfield (1982) pointed out that A. valida is a warm temperate species occurring not only in marine tidal pools, but also in mesohaline to brackish waters on muddy, gravelly beaches, in saltmarshes, and on logs. There is a possibility that A. valida is an introduced species; Barnard and Barnard (1990) considered this species to be transferred by commerce. Biogeographical Notes.-All taxa reported herein belong to the fauna of the warmer northern Argentine province (Cooke, 1895) rather than to the fauna of the cooler austral Magellanic province (Woodward, 1856). The faunistic limit between these provinces fluctuates between 41 and 44 S as a result of the variable influence of subtropical waters of the Brazilian Current and subantarctic waters of the Malvinas Current. Balech (1954) considered as acceptable a fluctuating limit between 42 and 43 S. The distribution of Elasmopus rnarplatensis and Corophium insidiosum coincides with the Bonaerensian district of the Argentine province. Melita palmata and A. valida reach their southern limit at about 43 S, with the first taxon extending north to 41 S and the second species widely distributed up to about 37 S. LITERATURE CITED Alonso, G. M. 1986. Nuevos registros de anfã podos marinos (Amphipoda, Gammaridea) para la Argentina.-Physis (Buenos Aires) A, 44: 67-79. â â â â, A. Tablado, J. J. Lopez Gappa, and N. Magaldi. (In press.) Seasonal changes in an intertidal population of the amphipod Ampithoe valida Smith, 1873.â Oebalia. Balech, E. 1954. 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