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Download Full Article in PDF Format A new genus and species of deep-water pontoniine shrimp (Decapoda, Caridea, Palaemonidae) from Taiwan Masako MITSUHASHI Tin-Yam CHAN Institute of Marine Biology, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung (Taiwan, R.O.C.) [email protected] Mitsuhashi M. & Chan T.-Y. 2006. — A new genus and species of deep-water pontoniine shrimp (Decapoda, Caridea, Palaemonidae) from Taiwan. Zoosystema 28 (2) : 389-398. ABSTRACT A new genus and species of pontoniine shrimp, Patonia mclaughlinae n. gen., n. sp., is described and illustrated based on a single ovigerous female collected KEY WORDS at depths of 209 to 280 m, during a recent deep-sea expedition off Taiwan. Th is Crustacea, Decapoda, new genus diff ers from other Pontoniinae genera in a combination of charac- Pontoniinae, ters: hepatic spine bearing a complete basal suture and possibly mobile, body deep-water, laterally compressed, rostrum distinctly dentate along entire dorsal margin and Taiwan, new genus, unarmed ventrally, basal antennular segment tridentate distolaterally, and second new species. pereiopod very slender with carpus much longer than chela. RÉSUMÉ Un genre et une espèce nouveaux de crevette Pontoniinae (Decapoda, Caridea, Palaemonidae) d’eau profonde de Taiwan. Une nouvelle espèce de crevette Pontoniinae appartenant à un nouveau genre, Patonia mclaughlinae n. gen., n. sp., est décrite et illustrée en se basant sur une unique femelle ovigère, récoltée entre 209 et 280 m lors d’une campagne récente MOTS CLÉS en eau profonde, au large de Taiwan. Ce nouveau genre diff ère des autres genres Crustacea, Decapoda, de Pontoniinae par un ensemble de caractères : épine hépatique présentant une Pontoniinae, suture basale complète et peut-être mobile, corps comprimé latéralement, rostre eau profonde, distinctement denté sur toute la longueur de son bord dorsal et avec un bord Taiwan, nouveau genre, ventral inerme, segment basal antennulaire tridenté distolatéralement et seconds nouvelle espèce. péréiopodes très grêles avec le carpe beaucoup plus long que la pince. ZOOSYSTEMA • 2006 • 28 (2) © Publications Scientifi ques du Muséum national d’Histoire naturelle, Paris. www.zoosystema.com 389 Mitsuhashi M. & Chan T.-Y. INTRODUCTION DIAGNOSIS Body moderately compressed laterally. Rostrum well During ongoing deep-sea expeditions off Taiwan, developed, exceeding eye, lateral carina well marked, an ovigerous female of an unusual pontoniine almost entire dorsal margin serrated with distinct shrimp was collected from 209-280 m deep. Us- teeth, some bearing basal suture; lower margin ing the existing keys to the Pontoniiae Kingsley, unarmed. Carapace glabrous; inferior orbital angle 1878 (e.g., Chace & Bruce 1993; Holthuis 1993), distinct; antennal spine submarginal; supraorbital this specimen keys out to Zenopontonia Bruce, and epigastric spines absent; hepatic spine large, with 1975 (Chace & Bruce 1993 – hepatic spine with distinct basal suture and possibly mobile. Abdomen distinct basal suture and possibly mobile, rostrum smooth, third somite not posteriorly produced, dentate dorsally and unarmed ventrally) or Allo- pleura rounded. Telson elongate, with two pairs of pontonia Bruce, 1972 (Holthuis 1993 – hepatic dorsal and three pairs of posterior spines. Eyes well spine with distinct basal suture and possibly mo- developed. Antennule slender, anterolateral end of bile, teeth on rostrum well developed and over basal segment multidentate. Antenna bearing basi- entire dorsal length, merus of second and third cerite spine, scaphocerite well developed. Epistome pereiopods without antero ventral tooth). However, unarmed. Fourth thoracic sternite without median the general appearance of the Taiwanese specimen projection. Mandible without palp. Maxillula with diff ers considerably from both Zenopontonia and bilobed palp, lower lacinia slender. Maxilla with Allopontonia in the body not cylindrical (but dis- simple palp, basal endite deeply bilobed, distally tinctly compressed laterally) and having slender setose. First maxilliped with long and slender palp, pereiopods with biunguiculate dactyli. On the exopod with large caridean lobe, fl agellum well other hand, the Taiwanese specimen shows close developed, coxal endite fused with basal endite, resemblance with Periclimenes Costa, 1844 but epipod large and bilobed. Second maxilliped with with the hepatic spine very large and bearing normal endopod, exopod distally setose, epipod sub- distinct basal suture. Th erefore, a new genus is rectangular, podobranch absent. Th ird maxilliped established for this new species. Th e holotype is with slender endopod, ischiomerus fused with basis, deposited in National Taiwan Ocean University, arthrobranch rudimentary. All pereiopods slender. Keelung (NTOU). Th e carapace length (cl) and First pereiopod similar to second pereiopod but body length (bl) are measured dorsally from the much shorter. Second pereiopods similar, segments postorbital margin to the posterior border of the unarmed; chela with fi ngers simple, closing entirely, carapace and the telson, respectively. with cutting edges unarmed; carpus longer than chela. Th ird to fi fth pereiopods with biunguiculate dactyli; ventral margins of propodi bearing few SYSTEMATICS minute spinules; meri lacking distal tooth. Uropod with protopodite unarmed posterolaterally, exopod Family PALAEMONIDAE Rafi nesque, 1815 with small distolateral spine accompanied with Subfamily PONTONIINAE Kingsley, 1878 larger movable spine medially. Genus Patonia n. gen. SYSTEMATIC POSITION Th e large hepatic spine with a complete basal suture TYPE SPECIES. — Patonia mclaughlinae n. sp., by and possibly mobile in this new genus is remarkable present designation. amongst the subfamily Pontoniinae. Only four pon- ETYMOLOGY. — Th e abbreviated form of the fi rst toniine genera have movable hepatic spines. Th ey are name of Dr Patsy A. McLaughlin, Pat, is used as Dasella Lebour, 1945, Paranchistus Holthuis, 1952, prefi x for this pontoniine genus. Th e new name is given in honor of her many important contribu- Allopontonia Bruce, 1972 and Zenopontonia Bruce, tions to the taxonomy and phylogeny of decapod 1975 (see Chace & Bruce 1993; Holthuis 1993; crustaceans. Bruce 1994). Th e new genus diff ers from Dasella 390 ZOOSYSTEMA • 2006 • 28 (2) A new pontoniine shrimp genus from Taiwan FIG. 1. — Patonia mclaughlinae n. gen., n. sp., holotype, ovigerous ♀ cl 4.0 mm, Taiwan (NTOUM00664). and Paranchistus in having the dorsal border of the questioned, and some species have already been rostrum entirely serrated with distinct teeth. Dasella separated (e.g., Duris & Bruce 1995; Bruce 2004; and Paranchistus have the dorsal margin of the ros- Bruce et al. 2005). Two species of Periclimenes, trum smooth or only armed distally. Allopontonia P. perturbans Bruce, 1978 and P. priodactylus Bruce, diff ers from the new genus in having a ventrally 1992, have a “possibly mobile” (Bruce 1978: 253) dentate rostrum, much stouter second pereiopod or “? mobile” (Bruce 1992: 53) hepatic spine, re- with the carpus only about 1/3 the length of the spectively. Whether these two could be assigned palm, and the distal two segments of the posterior to Patonia n. gen. will require studies of more pereiopods densely serrated with ventral spinules. specimens, as well as a phylogenetic evaluation of Th e new genus has a laterally compressed body, the family. whereas Zenopontonia has a subcylindrical body. Moreover, Zenopontonia also has stout second pereiopods with the carpus much shorter than the Patonia mclaughlinae n. sp. chela, and the dactyli of the posterior pereiopods (Figs 1-6) terminate in a single spine. Except for the basal suture of the hepatic spine, MATERIAL EXAMINED. — Holotype: Taiwan north eastern coast, TAIWAN 2003, R/V Ocean Researcher 1, stn Patonia mclaughlinae n. gen., n. sp. might be placed CP 216, 24°34.71’N, 122°4.02’E, beam trawl, 209- under Periclimenes Costa, 1844 as defi ned by Chace 280 m, 27.VII.2003, 1 ovig. ♀ cl 4.0 mm, bl 18.2 mm & Bruce (1993) and Bruce (1994). Periclimenes now (NTOUM00664). includes over 140 species and is extremely diverse ETYMOLOGY. — Th e specifi c name again honors Dr Patsy in morphology (Li 2000; Bruce 2004; Bruce et al. A. McLaughlin, in recognition of her important contri- 2005). Th e monophyly of Periclimenes has been butions to the knowledge of decapod crustaceans. ZOOSYSTEMA • 2006 • 28 (2) 391 Mitsuhashi M. & Chan T.-Y. FIG. 2. — Patonia mclaughlinae n. gen., n. sp., holotype, ovigerous ♀ cl 4.0 mm, Taiwan (NTOUM00664), hepatic spine, stained with methylene blue. DESCRIPTION Abdomen (Fig. 3) laterally compressed and A small size shrimp with laterally compressed smooth, about three times longer than carapace body. length; third tergite not posterodorsally produced; Rostrum (Figs 3; 4B) well developed, laterally pleura broadly rounded; second pleuron greatly ex- compressed, slightly curving down distally, just panded in ovigerous female holotype, and covering exceeding antennular peduncle; lateral carina well almost entire third pleuron; sixth somite 1.5 times defi ned and continuous with orbital margin; dorsal longer than fi fth somite and 1.8 times longer than border armed with eight distinct, evenly spaced teeth, width, posterolateral and posteroventral angles acute. posterior three teeth with indistinct basal suture; Telson (Fig. 4D) 1.2 times as long as sixth somite, two postorbital teeth present, with distinct basal four times longer than maximum width, tapering sutures; ventral border unarmed and convex. posteriorly; two pairs of dorsolateral
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