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Occurrence of a Rare Squaloid Shark, Trigonognathus Kabeyai, from the Hawaiian Islands L

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Occurrence of a Rare Squaloid Shark, Trigonognathus Kabeyai, from the Hawaiian Islands L Pacific Science (2000), vol. 54, no. 4: 389-394 © 2000 by University of Hawai'i Press. All rights reserved Occurrence of a Rare Squaloid Shark, Trigonognathus kabeyai, from the Hawaiian Islands l BRADLEY M. WETHERBEE2 AND STEPHEN M. KAnuRA3 ABSTRACT: The first occurrence of the rare viper shark, Trigonognathus ka­ beyai, from the central Pacific Ocean is reported. Morphometries are compared between this specimen and the type specimens from Japan, and this specimen differs from the types in only a few measurements. The poor preservation of this specimen precluded examination of internal anatomy. THE SHARK Trigonognathus kabeyai belongs (Pseudopentaceros wheeleri) aboard the to a recently described genus and species in NOAA ship Townsend Cromwell at 29° the family Squalidae. Only three specimens, 48.0' N, 179° 04.6' E on Southeast Hancock all from Japan, have been reported since this Seamount, approximately 300 km northwest species was described in 1990 (Mochizuki ofKureAtoll, NorthwesternHawaiianIslands. and Ohe 1990, Shirai and Okamura 1992; The shark was caught in an Aberdeen bottom L. J. V. Compagno, pers. comm.). This shark trawl, which was towed east to west across differs in skeletal morphology from other the seamount at a depth of approximately squaloid sharks and is distinguished from 270 m. Towing speed was between 2.5 and similar genera by the presence of a triangular 3.0 knots (4.6-5.6 km/hr) and the trawl was jaw and long, caninelike teeth (Shirai and hauled at approximately 2200 hours. Okamura 1992). Shirai and Okamura (1992) The shark was frozen aboard ship, trans­ grouped the genus Trigonognathus into the ferred to an onshore freezer, and stored fro­ subfamily Etmopterinae and speculated about zen until we examined it. Measurements were the mode of feeding used by this shark. We taken according to Compagno (1984) and report on the capture of an individual of expressed as percentage of total length. The T. kabeyai from the Northwestern Hawaiian specimen was x-rayed for determination of Islands, which represents the fourth known vertebral number and deposited in the Bernice specimen of this shark and the first occur­ P. Bishop Museum, Honolulu (BPBM 38354). rence in the central Pacific Ocean. We com­ pare morphometric measurements of the Hawai'i specimen with those of specimens captured in Japan. RESULTS MATERIALS AND METHODS Description On 15 August 1987, a 41.3-cm total Our specimen is similar in physical ap­ length (TL) female T. kabeyai was captured pearance to individuals described in other during exploratory fishing for armorhead studies. Both jaws are sharply triangular and contain widely spaced, long, slender, slightly 1 Manuscript accepted 17 December 1999. curved teeth (Figure la). Tooth counts for 2NOAA/NMFS/NEFSC, 28 Tarzwell Drive, Narra­ both upper and lower jaws of our specimen gansett, Rhode Island 02882 (E-mail: brad. are 9-1-10. The snout over the upper jaw is [email protected]). very flexible and can be easily separated from 3Department of Zoology, 2538 The Mall, University of Hawai'i at Manoa, Honolulu, Hawai'i 96822 (E-mail: the jaw and retracted as far back as below the [email protected]). eye (Figure lb). Spines are present on both 389 390 PACIFIC SCIENCE, Volume 54, October 2000 a FIGURE 1. Trigonognathus kabeyai, female, 41.3 em total length, from Hawai'i, BPBM 38354. a, Close-up of head with distinct caninelike teeth. b, Head with flexible snout distended. Scale bar = I em. dorsal fins; the length of the second dorsal fin Hawai'i specimen is 2.7% TL compared with spine is more than two times that of the first 0.9 and 1.8% for the Japan sharks. Distance dorsal fin spine. Flank markings are present from the snout tip to the eye is 3.1% of the on the underside of the body and appear to TL for our shark and 4.9 and 5.4% for the contain photophores. All fins are small and Japan sharks. The height of the trunk at the thin to the point of being translucent. origin of the pectoral fin is only 6.5% of TL compared with 12.0 and 12.4% for the Japan sharks. Differences are also fairly large be­ Morphology tween our specimen and the Japan specimens Measurements of our specimen generally for the length of the second dorsal fin base, agree with those of Mochizuki and Ohe pelvic fin base, and lower lobe of the caudal (1990) and are presented in Table 1. A fin. number of measurements for the Hawai'i specimen differ considerably from the mea­ Biology surements presented for the holotype and paratype. For example, the length of the base Because of the prolonged storage in a of the first dorsal fin for our shark is 7.7% of freezer, the internal organs of our specimen the TL, but only 4.6 and 4.7% for the Japan were not well preserved and few biological sharks. The length of the first gill slit of the observations were obtained for this shark. It Trigonognathus kabeyai in the Hawaiian Islands-WETHERBEE AND KAnDRA 391 b FIGURE 1. (continued) was not possible to identify reproductive Islands or nearby seamounts (Borets 1986, structures and the stomach was empty. Other Shirai and Tachikawa 1993, Wetherbee and elasmobranchs captured in the same trawl as Crow 1996). our specimen were six shortspine spurdog Depth ofcapture for the Hawai'i specimen (Squalus mitsukurii) and five smooth lantern (270 m) was slightly shallower than that re­ sharks (Etmopterus pusillus). ported for the holotype (330 m) and paratype (360 m) in Japan (Mochizuki and Ohe 1990). Our specimen may have been part of an as­ semblage ofsqualoid sharks that are common DISCUSSION near the bottom on slopes of seamounts in This is only the fourth known specimen of the Northwestern Hawaiian Islands (B.M.W., T kabeyai, and the first outside Japan. The unpub!. data). Although the condition of our three other specimens were all collected fairly specimen precluded examination of repro­ close to each other, east of Kochi Prefecture ductive structures, this is the second female in southern Japan. The occurrence in the captured, and it is considerably larger than Northwestern Hawaiian Islands greatly ex­ the previous female reported (25.8 cm TL) by pands the distribution of this species. There Shirai and Okamura (1992). The largest are apparently several species of deep-sea specimen found previously was a 37.2-cm TL sharks that are common to both Japanese male (Mochizuki and Ohe 1990). waters and to the Northwestern Hawaiian Some of the differences in morphometric TABLE 1 TOTAL LENGTH AND PROPORTIONAL DIMENSIONS (AS PERCENTAGE OF TOTAL LENGTH) FOR Trigonognathus kabeyai FROM THE HAWAIIAN ISLANDS AND FROM JAPAN HAWAI'I HOLOTYPE" PARATYPEa MEASUREMENT (cm) %TL %TL %TL Sex f m m Tota11ength (cm) 41.3 21.6 37.2 Snout tip to: Nostrils 0.4 1.0 1.2 1.0 Mouth 1.0 2.4 2.3 2.0 Eye 1.3 3.1 4.9 5.4 Spiracle 3.8 9.2 10.9 10.2 First gill slit 6.5 15.7 18.1 17.5 Fifth gill slit 8.9 21.5 22.2 22.3 Pectoral origin 8.9 21.5 Pectoral insertion 9.9 24.0 22.2 23.4 First dorsal origin 14.8 35.8 37.5 37.9 Pelvic origin 23.8 57.6 Second dorsal origin 25.2 61.0 60.6 63.2 Cloaca 25.4 61.5 60.2 61.0 Pelvic insertion 26.8 64.9 55.6 58.9 Upper caudal origin 33.9 82.1 81.9 83.3 Distance between bases: First and second dorsal 7.8 18.9 21.5 23.7 Second dorsal and caudal 5.4 13.1 15.0 14.1 Pectoral and pelvic 14.5 35.1 32.9 32.7 Pelvic and caudal 7.5 18.2 19.2 18.3 Distance between pectoral and pelvic origins 15.2 36.8 Mouth width 3.0 7.3 8.1 9.1 Horizontal eye diameter 2.1 5.1 5.3 5.2 Interorbital space 2.8 6.8 7.9 7.1 Interspiracle space 2.2 5.3 5.5 5.9 Internostri1 space 1.1 2.7 Gill slit length: First gill slit 1.1 2.7 0.9 1.8 Fifth gill slit 0.8 1.9 1.6 2.1 First dorsal fin: Overall length 4.2 10.2 9.5 9.8 Posterior margin length 1.8 4.4 4.7 4.8 Height 1.0 2.4 2.3 2.2 Base length 3.2 7.7 4.7 4.6 Spine length 0.5 1.2 3.5 Second dorsal fin: Overall length 5.5 13.3 11.9 12.1 Posterior margin length 1.9 4.6 4.6 5.0 Height 1.4 3.4 3.2 3.6 Base length 3.7 9.0 7.4 7.3 Spine length 1.2 2.9 Pectoral fin lengths: Overall 3.7 9.0 11.1 9.8 Base 1.4 3.4 Anterior margin 2.8 6.8 Posterior margin 2.4 5.8 Interior margin 2.3 5.6 Span 10.8 26.2 Pelvic fin lengths: Overall 4.7 11.4 10.7 11.7 Base 3.4 8.2 6.3 6.7 Trigonognathus kabeyai in the Hawaiian Islands-WETHERBEE AND KAJIURA 393 TABLE 1 (continued) HAWAI', HOLOTYFEa PARATYPEa MEASUREMENT (cm) %TL %TL %TL Caudal fin: Upper lobe length 7.1 17.2 19.2 17.6 Lower lobe length 2.9 7.0 8.6 8.6 Trunk at origin of pectoral fin: Width 4.3 10.4 9.3 11.0 Height 2.7 6.5 12.0 12.4 Tooth counts: Upper jaw 9-1-10 7-1-7 8-1-8 Lower jaw 9-1-10 7-1-7 8-1-8 Vertebral centra: Precaudal 63 62 62 Total 87 87 88 aFrom Mochizuki and Ohe (1990).
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