• DOI:10.11369/JJI1950.29.27
• Corpus ID: 88654046

Lepidopus calcar, a New Trichiurid Fish from the Hawaiian Underwater Ridge

@article{Parin1982LepidopusCA,
  title={Lepidopus calcar, a New Trichiurid Fish from the Hawaiian Underwater Ridge},
  author={Nikolay V. Parin and S. V. Mikhailin},
  journal={Japanese Journal of Ichthyology},
  year={1982},
  volume={29},
  pages={27-30}
}

• N. Parin, S. V. Mikhailin
• Published 30 June 1982
• Biology
• Japanese Journal of Ichthyology

A new trichiurid,Lepidopus calcar,is described.The species was discovered from the Colahan Seamount of the Hawaiian Ridge at a depth between 270 and 350m.It is characterized by a stout spur-like second anal spine not developed in adults of other species of Lepidopus. Number of vertebrae and dorsal fin-rays is less than in L.caudatus(Euphrasen)and more than in both L.xantusi Goode et Bean and L.dubius Parin et Mikhailin. According to Tucker(1956)the trichiurid genus Lepidopus contains two species-L. caudatus(Euphrasen,1788)and L.xantusi Goode et Bean,1896;recently one more species, L.dubius,was tentatively placed in the same genus by the authors(Parin and Mikhailin, 1981).Of these species L.caudatus occurs in the eastern North Atlantic and in the Mediterranean as well as in the Southern Hemisphere off South and Southwest Africa,South Australia and New Zealand(Parin and Bekker,1973), L.xantusi is known from the eastern Pacific from California(Hubbs et al.,1979)to Peru (Chirichigno,1974),and L.dubius is restricted in its distribution by the Gulf of Guinea and adjacent waters.In this paper a new species obtained from the Colahan Seamount of the Hawaiian Underwater Ridge in the North Pacific is described. Lepidopus calcar sp.nov. (Figs.1,2) Holotype.ZIL(Zoological Institute in Leningrad,Academy of Sciences of the USSR)45723, a ripe female,787mm in standard length; Colahan Seamount(31•K01'N,175•K53'E)at 270m,October 21,1979;bottom otter-trawl; coll.L.A.Boretz. Paratypes.ZMMU(Zoological Museum of the Moscow State University)P-15675,two specimens:a female,609mm in SL,and a male, 561mm in SL;Colahan Seamount(31•K02'N, 175•K53'E)at 270 350 m,October 14,1979; bottom otter-trawl;coll.L.A.Boretz. All type specimens in rather good condition but dorsal and anal rays mostly damaged;holotype with an old scar below the 29th dorsal ray and with caudal peduncle partially broken. Diagnosis.A species of Lepidopus with elongated and stout spur-like second anal spine,with a median sagittal crest atop the head completely confined to the nape,with slightly concave interorbit,with 98•`100 vertebrae,91•`93 dorsal fin-rays,and II,44•`47 anal fin-elements. Description of the holotype(data in parentheses refer to paratypes 609 and 561mm in SL).D 93 (91,92);A II,47(44,46);P1 12;P2 I,1.Vertebrae 43+57(44+54,43+57). Body elongate and strongly compressed,its width 3.4(3.2,3.5)in depth at level of anus. Upper profile of head oblique-concave,rising gently from above snout tip to the middle of orbits and then more steeply to the dorsal origin. Ethmo-frontal region not elevated.Interorbit slightly concave.Frontal ridges very low, converging posteriorly before the level of rear margin of eye.Their confluence elevated to support a short sagittal medial crest at the nape which continues into a ridge formed by first dorsal pterygiophore.Eye large,barely entering upper profile and slightly bulging laterally. Lower posterior margin of opercle almost straight. Mouth large,maxilla sheathed by preorbital, ending just before anterior margin of orbit. Lower jaw slightly projecting,with a moderate cartilaginous process.Nostril as a subvertical slit,about one-fifth snout-length before eye. Teeth flattened,lanceolate,their margins entire, without barbs.Anterior maxillary fangs immovable,strong,one on a left,two on a right side.Outer tooth row of 4•`5(5•`6)small teeth lateral to fangs and 10•`12(9•`12)teeth