Petroscirtes(Blenniidae,Tribe Nemophini)

Japanese Journal of Ichthyology 魚類学雑誌 Vol.30,No.31983 30巻3号1983年

First Records of the Blenniid Fishes, 76.5 mm in standard length(SL),collected from Petroscirtes springeri and Petroscirtes Tsunoshima,Nishi Umi,Ehime Pref.,Japan,at variabilis,from Japan depth of 25 m,on September 24,1981,by Aki- hisa Iwata.HUMZ 97082,male,76.3 mm SL, collected from the same locality as preceding Akihiko Yatsu,Akihisa Iwata and Mitsuaki Sato specimen on September 25,1981,by Akihisa Iwata.HUMZ 97083,sex unidentified,51 .7 mm Received January 18,1983)( SL,collecting data are the same as HUMZ 97082. NSMT-P(National Science Museum,Tokyo) Petroscirtes(Blenniidae,tribe Nemophini), 21488,male,74.1 mm SL,collected from Futo, comprising ten species,is widely distributed over Izu Peninsula,Shizuoka Pref.,Japan,at depth of the tropical and subtropical Indo-Pacific Region 45 m,on December 25,1981,by Atsushi Ono. from the Red Sea and southern Africa to the Description.Table 1 shows the selected charac- Society and the Line islands(Smith-Vaniz,1976). ters of the holotype,USNM(United States Na- Petroscirtes mitratus(a senior synonym of P. tional Museum)203279,and present material. elatus)and P.breviceps(syn.Dasson trossulus) Number of pores of cephalic sensory canals are have previously been reported from Japan.Arai invariable except for the left infraorbital series and Ida(1975)illustrated a single specimen of of HUMZ 97083 which has 8.Number of each P.breviceps(NSMT—P 18406),identified as sensory pore series are: nasal 2,interorbital 4, Dasson(=Petroscirtes)sp.,from Tanegashima supraorbital 2,infraorbital 7,mandibular 3, Island,Japan.Arai and Ida(1975)noted that preopercular 6,supratemporal 3,lateraltemporal except for its color pattern,which closely match- 3.Urogenital opening small and not pocket- ed that of Meiacanthus kamoharai,the specimen like.Padlike structure not developed at the tip agreed well with P.breviceps.Petroscirtes brevi- of anal spines.Anal-fin tabs were present in ceps has been reported as a possible mimic of three specimens(HUMZ 97083 without anal- Meiacanthus grammistes,and establishment of fin tabs).Outer lobes of caudal fin elongate in a second mimetic relationship with the closely NSMT-P 21488,HUMZ 92522 and HUMZ related and allopatric M.kamoharai might be 97082,but not in HUMZ 97083(Fig.1). expected(Smith-Vaniz,1976 and personal com- Color pattern.A stripe extends from snout munication).Recently,four specimens of P. through eye and opercular spot and ends as a springeri Smith-Vaniz,1976 and one specimen of dark basicaudal spot.This stripe became indis- P.valiabilis Cantor,1850 were collected from tinct after preservation in larger specimens. southern Japan.These records represent north- Distal one-third of dorsal fin slightly dark.A ern range extentions from Taiwan to Japan dark stripe along proximal one-third of dorsal for both species,and the second record of P. fin except for holotype and HUMZ 97083.In springeri. HUMZ 97083,this stripe is interrupted to form a The methods of Smith-Vaniz(1976)were used series of elongate blotches(Fig.1).Although for counts,measurements and definitions of Smith-Vaniz(1976)did not mention this series cephalic sensory pores and cirri.Vertebral of blotches on the dorsal fin,his Fig.105 shows counts include precaudal + caudal number. the trait. Radiographs were used to count vertebrae,ribs, Comparison with original description(Smith- and dorsal and anal rays.Color pattern descrip- Vaniz,1976).Most of characters of the present tions are from preserved specimens.Sex was material agree with the original description which determined by the shape of urogenital opening . was based on only one small male.Several differences were noticed in color pattern(see Petroscirtes springeri Smith-Vaniz,1976 above),cirri and caudal fin length(Table 1). (New Japanese name: Futahoshi-nijiginpo) Since these characters often tend to change with Fig.1)( growth or by sex in Nemophini(Smith-Vaniz, Material.HUMZ(Laboratory of Marine 1976: 10),we regard the differences as individual Zoology,Hokkaido University)92522,male , variation.

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Fig.I.Penrawn-lec springeri,NSMT-P 21488(top),74.1 mm SL and HUMZ 97083(bottom),51.7 mm SL.

Fig.2.Petroscirtes variabi(i.c,MTUF 23458,57.0 mm SL.

Second dorsal-fin spine I l.8 % SL,pelvic fin Petroscirtes variabilis Cantor,1850 14.4% SL,caudal fin 21.8% SL.Outer lobes of (New Japanese name:Inu-ginpo) caudal fin not elongate. Fig.2)( Color pattern.Body with five broad verti- Material.MTUF(Museum,Tokyo Univer- cal dusky bands on side excluding a dark blotch sity of Fisheries)23458,male,57.0 mm SL, on caudal peduncle,middle part of each band collected from Kabira Bay,Ishigaki Island,Oki- darker to form a horizontal stripe from eye to nawa Pref.,Japan on November 15,1977,by caudal fin base.A dark blotch on proximal Mitsuaki Sato. part of caudal fin.Dorsal and anal fins with Description.D.Xl,17:A.II,17:P,.14: a series of dusky blotches on proximal part. vertebrae 12+21:pleural ribs 9:epipleural ribs Most of head,body,dorsal and anal fins with 13:upper jaw incisors 32:lower jaw incisors brown spots. 38.Number of each cephalic sensory pore Notes.The number of vertebrae,total dorsal- series are: nasal 2,interorbital 4,supraorbital fin elements and segmented anal rays of the 2,infraorbital 7,mandibular 3,preopercular 6, present specimen agree completely with the modal supratemporal 3,lateraltemporal 3.All cirri number of these counts in specimens from the simple.Urogenital opening small and not Philippines,New Guinea and other localities pocket-like.Tip of the dorsal and anal spines except Sri Lanka(see table 10 of Smith-Vaniz and rays without pad like structure,tabs or flap. (1976)).

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B2.Symphyseal mandibular cirrus simple;total Key to species of Japanese Petroscirtes dorsal-fin rays less than 32;segmented (modified from Smith-Vaniz(1976)) anal-fin rays less than 20(P.breviceps Al.First dorsal-fin spine distinctly longer than rarely with 21 rays).

fourth giving fin notched appearance in Cl.Broad dark stripe along entire base of all but smallest juveniles;first dorsal-fin dorsal fin;segmented dorsal-fin rays 17•`

spine always longer than second(occasion- 21,usually 19;segmented anal-fin rays 17•` ally subequal);outer rays of pelvic fin with 21,usually 19;(Indian and western Pa-

dark spot(indistinct in juveniles)near base cific oceans,excluding eastern Australia) of fin;(widespread Indo-Pacific)•c P •cbreviceps P.mitratus C2.A series of 5 or 6 dark blotches along A2.First dorsal-fin spine subequal or shorter dorsal fin base;segmented dorsal-fin rays than fourth;first dorsal-fin spine always 16•`19,usually 17;segmented anal-fin

shorter than second;outer ray of pelvic rays 16 19,usually 17;(eastern Indian fin without a dark basal spot. and Pacific oceans)•cP variabilis B1.Symphyseal mandibular cirrus usually multifid or bifurcate;total dorsal-fin rays Acknowledgments 33•`34;segmented anal-fin rays 21•`22; We wish to express our gratitude to Dr. Japan and Taiwan)P springeri( Teruya Uyeno(NSMT)and Messrs.Hajime

Table 1.Selected characters of holotype and present material of Petroscirtes springeri.Data of holotype,USNM 203279,were taken from Smith-Vaniz(1976).L,left side;R,right side .

*This character of the holotype was taken from original d escription or fig.13 of Smith-Vaniz(1976).

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Masuda and Atsushi Ono(Izu kaiyo-koen), Center, 3-27 Kioi-cho, Chiyoda-ku, Tokyo 102, for the loan of a specimen of P.springeri.We Japan; AI: Laboratory of Embryology and Genetics, are also grateful to the following persons who Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate 041, Japan; MS: Japan NUS helped us in various ways: Messrs.Jin Hattori Co., Ltd., 2-7-1 Nishishinjuku, Shinjuku-ku, Tokyo and Kiyoshi Fujita(Tokyo University of 160, Japan) Fisheries),Drs.Ryoichi Arai and Keiichi

Matsuura(NSMT)and the staffs of the Yaeyama 日本初記録のイソギンポ科の2種,フタホシニジギン Branch of Okinawa Prefecture Fisheries Experi- ポ(新称)とイヌギンポ(新称) mental Station.Dr.William F.Smith-Vaniz 谷津明彦・岩田明久・佐藤光昭 (Academy of Natural Sciences of Philadelphia) フタホシニジギンポPetroscirtes springeri Smith- critically read the manuscript. Vaniz,1976が愛媛県西海および静岡県富戸から,また,イヌギンポP.yariabilis Cantor,1850が沖縄県 Literature cited 石垣島から得られた。両種とも従来の報告による北限

Arai, R. and H. Ida. 1975. The sea fishes of は台湾であり,目本では初記録となるので,両種を記

Yakushima and Tanegashima Islands, southern 載し,新和名を提唱し,日本産ニジギンポ属Petro- Kyushu, Japan. Mem. Natn. Sci. Mus., Tokyo, scirtes 4種の検索表を付した.本報告は,フタホシニ

(8): 183•`198, pls. 17•`22.(In Japanese). ジギンポの世界で2番目の記録でもある。 Smith-Vaniz, W. F. 1976. The saber-toothed blen-

nies, tribe Nemophini (Pisces: Blenniidae). Acad. (谷津:102東京都千代田区紀尾井町3-27海洋水産 Nat. Sci. Philadelphia, Monogr., (19): i•`vii+1•` 資源開発センター;岩田:041函館市港町3-1-1北

196. 海道大学発生学遺伝学講座;佐藤:160東京都新宿区西新宿2-7木日本エヌ・ユー・エス株式会社) (AY: Japan Marine Fishery Resource Research

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