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A New Reef Lobster of the Genus Enoplometopus A. Milne Edwards, 1862 (Decapoda, Nephropoidea) from the Western and Southern Pacific

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A New Reef Lobster of the Genus Enoplometopus A. Milne Edwards, 1862 (Decapoda, Nephropoidea) from the Western and Southern Pacific A new reef lobster of the genus Enoplometopus A. Milne Edwards, 1862 (Decapoda, Nephropoidea) from the western and southern Pacific Tin-Yam CHAN Institute of Marine Biology, National Taiwan Océan University, Keelung, (Taiwan, R.O.C.) [email protected] Hsiang-Ping YU Graduate School of Fisheries Sciences, National Taiwan Océan University, Keelung, (Taiwan, R.O.C.) Chan T.-Y. & Yu H.-P. 1998. — A new reef lobster of the genus Enoplometopus A. Milne Edwards, 1862 (Decapoda, Nephropoidea) from the western and southern Pacific. Zoosystema 20 (2): 183-192. ABSTRACT A new reef lobster, Enoplometopus crosnieri n.sp., is described based on a Taiwanese spécimen. This new species can be readily distinguished from ail KEYWORDS Crustacea, others of the genus by having one intermédiare and one postcervical teeth on Decapoda, the catapace, as well as a distinctive colotation. E. crosnieri is also known Nephropoidea, Enoplometopus, from the Timor Sea and French Polynesia. A key to the genus Enoplometopus new species. is also provided. RÉSUMÉ Une nouvelle langouste récifale du genre Enoplometopus A. Milne Edwards, 1862 (Decapoda, Nephropoidea) de l'ouest et du sud Pacifique. Une nouvelle « langouste » récifale, Enoplometopus crosnieri n.sp., est décrite à partir d'un MOTS CLES spécimen de Taïwan. Cette nouvelle espèce peut être facilement distinguée Crustacea, de toutes les autres du genre par la présence sur la carapace d'une dent inter­ Decapoda, médiaire et d'une dent postcervicale et par sa colotation distincte. E. crosnieri Nephropoidea, Enoplometopus, est également signalée de la mer de Timor et de Polynésie française. Une clé nouvelle espèce. du genre Enoplometopus est présentée. ZOOSYSTEMA • 1998 • 20(2) 183 Chan T.-Y. & Yu H.-P. INTRODUCTION used for comparisons: E. occidentalis (Randall, 1840) [Taiwan: 3 â â 44.2-46.5 mm cl; 4 ? î In January 1997, a live spécimen of an unusual 31.9-44.8 mm cl; Singapore aquarium shops, reef lobster of the genus Enoplometopus A. Milne- place of origin unknown: 1 ? 14.3 mm cl], Edwards, 1862, was found in a sea-food restau­ E. debelius Holthuis, 1983 [Singapore aquarium rant near the National Taiwan Océan University shops, place of origin unknown: 2 â â (NTOU), Keelung. The animal was immediately 11.2-13.8 mm cl, 1 9 12.3 mm cl], E. daumi purchased and kept in an aquarium at the Holthuis, 1983 [Philippines, 1 ovig. 9 18.5 mm NTOU. This large spécimen was found to have a cl; Singapore aquarium shops, place of origin completely différent coloration (Figs 1, 2) than unknown: 3 â â 13.6-18.6mm cl, 2 9 9 E. occidentalis (Randall, 1840), the only species 13.1-14.2 mm cl], E. gracilipes (de Saint Laurent, of the genus previously known from Taiwan 1988) [French Polynesia: 1 S 46.1 mm cl]. (Chan & Yu 1993). Although the présence of a large red ocellus (or "bullseye") on the latéral carapace in our Taiwanese spécimen resembles SYSTEMATIC ACCOUNT the colour pattern reported for E. holthuisi Gordon, 1968, the morphological characters of Enoplometopus crosnieri n.sp. the Taiwanese spécimen differ considerably from (Figs 1-3) E. holthuisi. Our spécimen and E. holthuisi could be assigned to différent subgenera or even gênera Enoplometopus n.sp. - Poupin et al. 1990: pl. III-c; [e.g. Enoplometopus (sensu Holthuis 1983) for the Poupin 1996: pl. V-h. Taiwanese spécimen and Hoplometopus Holthuis, 1983 for E. holthuisi] according to some authors MATERIAL EXAMINED. — Northern Taiwan. Keelung, Ho-Ping Island (probably caught with lobster trap net (e.g. Holthuis 1983; Kensley & Child 1986; de at about 100 m deep off Keelung), January 1997: Saint Laurent 1988; Tiirkay 1989; Poupin et al. holotype, ovig. ?, 55.4 mm cl, 135.7 mm tl, molt 1990; Poupin 1996). Careful comparisons sho- 54.7 mm cl, obtained from sea-food restaurant in fish wed that our spécimen is distinct from ail known market (NTOU 1997-1-H). species of the genus. Moreover, the colour photo­ TYPE-LOCALITY. — Keelung, northern Taiwan. graph of a spécimen from French Polynesia (Poupin et al. 1990: pl. III-c; Poupin 1996: ETYMOLOGY. — The genus Enoplometopus already has pl. V-h), and some unpublished photographs of a species named after two prominent macruran decapod spécimen from the Timor Sea (A. J. Bruce, pers. taxonomists who are still with us; i.e. F. A. Chace Jr. comm.) also clearly show that they represent the and L. B. Holthuis. It is a pleasure here to include A. Crosnier's name in this genus. Moreover, this same undescribed species discovered in Taiwan. active and colourful lobster matches well with the This reef lobster is here described. impression of A. Crosnier to other carcinology col­ leagues. SlZE. — Rather large for the genus, with carapace MATERIAL AND METHODS length 46-54.7 mm. The Taiwanese spécimen was kept in an aqua­ DISTRIBUTION. — Western and southern Pacific; known with certainty from Taiwan, Timor Sea (near rium at NTOU for about four months, molting Darwin, Australia) and French Polynesia (see once before dying. Both the spécimen and com­ "Remarks"). At depths of about 100 m, on hard bot- plète molt are deposited at the crustacean collec­ toms. tion at NTOU. The carapace length (cl) and body length (bl) given were measured dorsally DESCRIPTION from the orbital margin to the posterior margin Size moderately large. Body distinctly pubescent of the carapace and distal margin of the telson, and with many long stiff hairs. Rostrum elonga- respectively. ted, triangular and sharply pointed; exceeding The following species deposited at NTOU were antennular peduncle, and armed with two pairs 184 ZOOSYSTEM A • 1998 • 20(2) A new species Enoplometopus of latéral teeth. Carapace bearing one large supra- ventral spines, inner margin serrated, consisting ocular spine, one large intermediate, six médian, of row of sharp teeth; basis with distoventtal two latéral and one postcervical teeth; interme­ spine. Fitst chelipeds exceeding scaphocerite by diate tooth larger than supta-ocular spine; one half carpus; almost equal in size and shape médian teeth with anteriormost one small but except for cutting edges of fingers; chelae with distinct while posteriormost one more or less as fingets slightly longet than palm; fixed finger large as intermediate tooth; postcervical tooth slightly longer than movable finger, outer and large, similar in size to supta-ocular spine. inner margins heavily serrated with large teeth Anterolatetal carapace armed with latge antennal and coveted with many long stiff hairs, tips of spine (strongly bent inwards) and minute bran- fingers elongate and curving inwards; dorsal and chiostegal spine. Dorsal surfaces of rostrum and venttal surfaces of palm densely covered with carapace scattered with few long stiff hairs. Eyes sharp tubercles except for marginal areas; dorsal well-developed, subspherical. Scaphocerite (inclu- hinge of fingers armed with large tooth, ventral ding distolateral tooth) reaching tip of antennular hinge bearing large tubercle; fingers distinctly peduncle. Antennal peduncle slightly overrea- tidged medially and beating only few shatp ching scaphocerite; basai segment bearing a tubercles near bases; cutting edges of right fingers strong ventral spine (basicerite spine), with dorso­ distributed with many small crushing teeth as lateral angle blunt and not developed into spine. well as a few larger ones on that of movable fin­ Maxilliped III overreaching scaphocerite by distal ger, while that of fixed finger also bearing five two segments; carpus bearing small distoventral large broad teeth; cutting edges of left fingets ser­ spine; merus with two large distoventtal teeth; rated, with numerous small sharp teeth, that of ischium having one disto-outer and one disto­ fixed finger also bearing six large teeth while that FIG. 1. — Enoplometopus crosnieri n.sp., holotype ovig. 9, 55.4 mm cl., Keelung, Taiwan (NTOU 1997-1-H). ZOOSYSTEMA • 1998 • 20(2) 185 Chan T.-Y. & Yu H.-P. of movable finger having eleven additional white bands. Antennular flagella with outer surfa­ moderate sized teeth; some long stiff hairs pré­ ce orange; inner surface whitish. Antennal flagella sent along cutting edges of both chelae; carpus uniformly orange. Base of antennal peduncle and and merus nearly completely covered with large branchiostegal area on carapace conspicuously and small teeth along ail margins; ischium white, with area in-between distinctly reddish. having inner margin entirely serrated with teeth, Abdominal tergites mainly orange pink and with outer margin bearing only large distal tooth. some scattered red blotches; dorsal ridges on somi- Pereiopods II to V subchelate, with distal prolon­ te II to VI reddish, each bearing white médian gations (or palms) of propodi becoming less spot; red-margined white spot présent above each developed posteriorly; distal prolongation of pro- abdominal hinge; pleura generally reddish and podus bearing two long distal spines in pereio- bearing two large white spots antero- and posteto- pod II, that of pereiopod III having two distal latetally (former one larger); somite VI covered and one subdistoventral long spines, that of with irregular thick transverse white band near pereiopod IV with thtee distal and one subdisto­ posterior margin. Tailfan with distal margin red­ ventral long spines, that of peteiopod V spoon- dish, basai part mostly reddish, and distal part shaped and without spine; dactylus of mainly pale purple. pereiopod V also bearing basai knob. Recepta- Maxilliped III with alternating orange and white culum seminis on thoracic sternum with blunt bands. Large cheliped with palm light purplish anterior end; posterior end wider and also blunt; red, tubercles reddish, teeth on latéral margins latetal margins as double convex lobes, without whitish and with red bases (those on inner mar­ spine or tubercle. gin of palm as large red spots); hinge between Abdomen with many long stiff hairs (more fmgers marked as large red spot; fixed finger whi­ numerous posteriorly), bearing a low but distinct tish and with médian ridge covered with thick médian ridge on somites II to VI; pleura II, III, red bands, cutting edges with small reddish teeth IV and VI provided with blunt posterolateral and large whitish teeth; movable finger orange angle; pleuron V with margins generally smooth.
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