Four specimens,zi UT(Zoological Institute, Faculty of Science,University

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1 魚類学雑誌:Japan.J.Ichthyol.19(3) November30,1972 Norrnmost Record,from with Ovoviviparous Okinawa Some (Received After Mohr's(1926a)comprehensive,Mohr(1926b),Herre(1933), Weed(1933),Fowler(1934,1937),Smith(1945), Jones Pantulu(1958),Chang Prefecture,Japan, Morphological Katsusuke Notes Meguro May 23,1972) revision Chang (1962),Smith Smith(1963), Tayler (1964)recorded species belonging to genus from various localities.these records indicate that all species inhabit Seven specimens genus Miyara waters.they have north Philippines River in half beak were Ishigaki-jima,Okinawa fied are believed genus as Z.dunckeri pelago,dutch be at Pre-.They norrnmost record are identi- Mohr. The halfbeaks genus are ovoviviparous, one anal st rays is exped in width as secondary sexual character male.according to Breder Rosen(1966), use modified anal fin rays is not clear, evidently transfer sperm is effected by rar long genital papilla. Fig.1. Mohr,1926:257. Pomerania,New Mecklen- East Archi- Indies. Four specimens,zi UT(Zoological Institute, Faculty Science,University Tokyo) , one juvenile specimen, ZIUT 52419,collected at Ishigaki-jima,Okinawa Prefecture on 9 October,1968.Two uncatalogued specimens [denoted a(fig.1) b in present paper] collected at same station on 27 October,1971.All specimens were collected from a pool on sy bank formed in center Miyara River, about 500 m from mouth river.the water pool was perhaps slightly saline, pool,about 3 m to 5 m in width 40 cm in depth,was thought to have been separated from main flow river for a considerable time.the juvenile was probably born in pool.ziut specimen a was dissected stained with specito name) Rayong;Smith,1945:433,Bismarck to collected dunckeri Guinea,New Mohr Japanese burg,ambonia:fowler,1937:214,fig.192, not or belonging fecture,ca.24 20'N,124 10'E.These mens dunckeri Komochi-sayori(new New coastal fluvial been recorded from Hainan Isl. Halfbeak,Genus clunekeri from Ishigaki-jima,Okinawa 186 Prefecture,80.0mm in stard length.

2 alizarin red for study osteological characters. Description Measurements counts are given in Table 1.Or counts are :pectoral rays i+7+ii (left right in all specimens);pelvic rays i+ 5(left right in all specimens);caudal rays v+11+v(ziut 52415);predorsal scales 12 ` ;branchiostegal rays 10(ZIUT 52415);vertebrae 40(ZIUT 52415). External characters.in present specimens length triangular part upper jaw is 1.0 `1.1 in its width.the length lower jaw in stard length was l.9 `2.1 in male 2.3 `2.5 in female. Fishes this genus are known to have a pair long nasal barbels(weed,1933),which were confirmed on present specimens from Ishigaki-jima(Fig.2,A).The infraorbital canal is confined anterior to eye.the sensory canal pores(right side)are three on infraorbital canal,seven(including anterior nasal pore)on supraorbital canal, about 25 on preoperculo-mibular canal (Fig.2,B).The 6th anal st ray in male Z.dunckeri from Ishigaki-jima(80.0 mm in stard length)is thickened as intromittent organ, this ray is longer than or rays.its length is 16.3 mm, its maximum width is 2.0mm. The anal papilla male is pointed at tip it,but genital opening female (58.7mm in stard length)is located near pointed tip(fig.3).the anal papilla male is 1.3 as long as that female it is 1.5 as wide as that. Color.The body is light brown in life.after it was collected, species became dark grey all over,but changed to pale grey after preservation in formalin.on side body,a dark brown line runs from rear gillcover to middle caudal peduncle. The ventral part elongated lower jaw its vicinity are nearly black.the upper margin dorsal fin is dark, all or fins are nearly hyaline. The juvenile specimen(fig.6).ziut mm in stard length.the nasal barbel has not yet been developed.the specimen has a well-developed preanal finfold.the color in formalin is dark brown, on body from dorsal to middle side, Table 1.Measurements counts specimens dunckeri from Ishigaki-jima.

3 A B Fig.2.The dorsal view head(a), lateral view sensory canals pores(b) a male dunckeri,ziut 52417,58.7mm in stard length.anp,anterior nasal pore;e,eye;io,infraorbital canal;lj,lower jaw;nb,nasal barbel;porn,preoperculomibular canal;scp,sensory canal pore;so,supraorbital canal;uj,upper jaw. A B Fig.3.The urogenital regions male female dunckeri.a,male,58.7mm in stard length ZIUT 52416; B,female, 58.7mm,ZIUT a;anus,af;1st anal fin ray,alp;anal papilla,go;genital openning. Fig.4.The upper lower jaws dunckeri.ziut 52415,male, 53.0mm in stard length.a,angular;ar, articular;d,dentary;m,maxillary;pm,premaxillary;scp,sensory canal pore.

4 Fig.5.Juvenile specimen dunckeri,showing preanal finfold.ziut 52419, 12.6 mm in stard length. Fig.6.Anal rays,radials, haemal spines dunckeri.the distal radials are exposed by dislocating anal st rays. Male,80.0mm in stard length.afr,anal fin ray;dr,distal radial;hs,haemal spines;pr, proximal radial. re are six dark brown blotches. Osteological characters based on ZIUT specimen a.the dentary is five times longer than premaxillary.there are two or three rows small teeth along lower edge premaxillary, two or three rows conical very small teeth,on dentary just below teeth premaxillary. The sensory canal dentary(a part preoperculo-mibular canal)runs lengthwise close to upper edge(fig.4). As mentioned above, 6th anal st ray in adult male is thickened its shape from middle to distal part is fearlike.the distal end proximal radial which supports 6th anal st ray is also wider than ors.the distal radials on anal rays from first to 10th are well recognized by staining by alizarin,but those 11th,12th 13th are not stained with alizarin(fig.6). Notes.According to Mohr(1926a),in males amblyurus,z.kampeni,z.brevirostris,z.dispar Z.dunckeri, some dorsal st rays are elongated,but in Z.caudovittatus,Z.novaeguineae,Z.quadrimaculatus,Z.pappenheimi,Z.beauforti buffoni such a male character is not developed, each 3rd,4th 5th st rays dorsal fin in former group is 2-3 times longer than or rays,but in latter group difference in length rays is not so conspicuous.in adult specimens from Ishigaki-jima, 4th dorsal st ray is longer than ors. Z.dispar Z.brevirostris are close to Z. dunckeri in measurements counts,but y differ in following.the 4th dorsal ray adult male Z.dunckeri Z.brevirostris is enlarged elongated,but that Z.dispar is not, 6th anal ray(intromittent organ) Z.dunckeri is enlarged

5 Japan.J.Ichthyol.19(3) November 30,1972 thickened, but that Z.brevirostris is not enlarged.accordingly,in pattern adult male dorsal anal fin rays agree with Z.dunckeri in that specimens from Ishigaki j ima. Acknowledgments I would like to express my most sincere thanks to His Imperial Highness Crown Prince Akihito,for his kindness providing me every facility for study indicating important literature.thanks are also due to Drs. Katsuzo Kuronuma,Tokiharu Abe, Yoshiaki Tominaga,for reading manuscript loan literature;mr.teiji Yagi,Chamberlain to Crown Prince,for advice guidance;mr Hiroshi Ono University Keio,for help in collecting specimens. Literature cited Breder, C. M. D. E.Rosen Modes reproduction in fishes. Dept. Ichthyol. Amer. Mus. Nat., The Natural History Press, New York, 941 pp. Chang, C. L. Y. W. Chang Hemirhamphidae. In Zoological Institute, Academia Sinica, Oceanographical Institute Fisheries College Shang-hai." The fishes South China Sea". Science Press, Peking, 1184 pp., 849 figs. In Chinese. Fowler, H. W Descriptions new fishes obtained in 1907 to 1910, chiefly in Philippines Isls adjacent seas. Proc. California Acad. Sci., 85 (1933): , figs Fowler, H. W Zoological results third de Schauensee Siamese expedition, part VIII. Fishes obtained in Acad. Nat. Sci. Philadelphia, 139 (1947): , figs Herre, A. C. T Twelve new Philippine fishes. Copeia, 1933(1): Jones, S. V. R. Pantulu On some larval juvenil fishes from Bengal Orissa coasts. Ind. J. Fish., 5(1): , figs Mohr, E. 1926a. Die Gattung Gill. Zool. Jahrb. Abt. Geogr. Biol. Tiere, 52: , figs Mohr, E. 1926b. Des Male von clarus Mohr. Zool. Anz. 68: , fig. 1. Smith, H. M The fresh-water fishes Siam, or Thail. Bull. U. S. Nat. Mus., 188: i-ix, 1-622, figs Smith, J. L. B. M. M. Smith The fishes Seychelles. Dept. Ichthyol. Rhodes Univ., Grahamstown, 251 pp., 98 pls. Tayler, W. R Fishes Arnhem L. Rec. American-Australian Sci. Exp. Arnhem L, 4 (1964): Weed, A. C Notes on fishes family Hemirhamphidae. Zool. Field Mus. Nat. Hist., 20: 41-66, figs (The Crown Prince's Palace,Motoakasaka,Minato-ku, Tokyo,Japan)

LIBRARY. Class\ V"^ A *Ii:T_

$LIBRARY. Class\ V^ A *Ii:T_$ LIBRARY Class\ V"^ A *Ii:T_ ^ Publications OP FIELD MUSEUM OF NATURAL HISTORY ZOOLOGICAL SERIES Volume X Chicago, U. S. A. 1909-1923 7/,3 ^Issued September 18, 19 12. 69 NEW SPECIES OF FISHES FROM