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A Revision of Neosesarma (Crustacea: Brachyura: Sesarmidae) with the Description of a New Species Peter J.F

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A Revision of Neosesarma (Crustacea: Brachyura: Sesarmidae) with the Description of a New Species Peter J.F Memoirs of the Queensland Museum | Nature 56 (1) © Queensland Museum PO Box 3300, South Brisbane 4101, Australia Phone 06 7 3840 7555 Fax 06 7 3846 1226 Email [email protected] Website www.qm.qld.gov.au National Library of Australia card number ISSN 0079-8835 NOTE Papers published in this volume and in all previous volumes of the Memoirs of the Queensland Museum may be reproduced for scientific research, individual study or other educational purposes. Properly acknowledged quotations may be made but queries regarding the republication of any papers should be addressed to the Director. Copies of the journal can be purchased from the Queensland Museum Shop. A Guide to Authors is displayed at the Queensland Museum web site www.qm.qld.gov.au A Queensland Government Project Typeset at the Queensland Museum A revision of Neosesarma (Crustacea: Brachyura: Sesarmidae) with the description of a new species Peter J.F. DAVIE Queensland Museum, PO Box 3300, South Brisbane, Qld 4101, Australia Davie, P.J.F. 2012 02 17. A revision of Neosesarma (Crustacea: Decapoda: Sesarmidae) with the description of a new species. Memoirs of the Queensland Museum – Nature 56(1): 221–233. Brisbane. ISSN 0079–8835. Accepted 25 November 2011. ABSTRACT The Indo-west Pacific mangrove crab genus Neosesarma Serène & Soh, 1970, is revised. A new species, N. hirsutus, is described from northern Australia. The distribution of N. rectipectinatum is extended south to northern Australia and southern Papua. All species can be separated by differences in male claw tuberculation, the length and number of teeth of the pectinated crest on the dorsal surface of the cheliped palm, and the shape of the male first gonopods. r Crustacea, Brachyura, Grapsidae, Sesarmidae, mangroves, Indo-West Pacific, new species. The present paper is part of an ongoing study Abbreviations used in the text are: QM, of the Sesarminae. Previous papers have dealt Queensland Museum, Brisbane; NT, Northern with revisions of Sarmatium (Davie, 1992) and Territory; NHM, Natural History Museum, Neosarmatium (Davie, 1994; Rahayu & Davie, London; MNHN, Muséum national d’Histoire 2006), and new species and new records of naturelle, Paris; ZRC, Zoological Reference Parasesarma (Davie 1993; Davie & Pabriks 2010); Collection of the Raffles Museum, National Metasesarma and Geosesarma (Ng & Davie, Museum of Singapore. 1995); Perisesarma (Rahayu & Davie, 2002; Davie, 2003; Davie 2010); Metaplax (Davie & SESARMIDAE Dana, 1851 Nguyen, 2003); and Sesarmoides (Davie & Ng, 2007). Neosesarma Serène & Soh, 1970 Neosesarma Serène & Soh, 1970, was diagnosed Neosesarma Serène & Soh, 1970: 394, 405; Ng et al. to include a number of Indo-West Pacific species 2008: 222 (in list). previously included in Sesarma (Sesarma), viz., Type species: Sesarma gemmiferum Tweedie, 1936, by S. gemmiferum Tweedie, 1936, S. rectipectinatum original designation. Type locality: Johore Straits, Tweedie, 1950, S. aequifrons Rathbun, 1914, and Singapore. Gender neuter. tentatively, Sesarma laeve A. Milne-Edwards, Diagnosis. Carapace not deeply vaulted; a single 1869. Davie (1994) has shown that S. aequifrons acute epibranchial tooth, distinctly separated is a junior synonym of S. laeve, and transferred from exorbital angle by sulcus; anterior frontal that species to Neosarmatium Serène & Soh, margin nearly straight, without well-marked 1970. Collections of sesarmids from northern median concavity; antennal peduncle not exclud - Australia have revealed the presence of a new ed from orbit; postfrontal lobes subequal in species of Neosesarma from the Northern width; not markedly swollen. Male cheliped Territory, and considerably extend the range of with a single longitudinal pectinated crest on N. rectipectinatum. upper surface of palm separated from inner Memoirs of the Queensland Museum | Nature 2012 56(1) www.qm.qld.gov.au 221 Davie margin; a row of regular, more or less conical Kang Rd, north-western Singapore, mangroves, P. % dactylar tubercles. Posterodistal border of merus Davie & P. Ng, 06.09.87. QM-W14871, (17.25 × 16.5 of ambulatory legs generally unarmed, but may mm), Lim Chu Kang Rd, north-western Singapore, mangroves, P. Davie & P. Ng, 06.09.1987. be denticulate (P2–4 of N. hirsutus with 5–8 small spines; P5 with spaced granules). Description. Carapace c. 1.1 times boader than long, maximum breadth across exorbital teeth; N. gemmiferum Species included: (Tweedie, single epibranchial tooth separated by deep N. hirsutus N. rectipectinatum 1936); sp. nov.; gap; lateral margins slightly convergent post- (Tweedie, 1950). eriorly. Front sharply deflexed, margin finely KEY TO SPECIES OF NEOSESARMA beaded, almost straight, with only very shallow median emargination. Frontal width c. 0.65 1. Dactyl of male cheliped with 21–26 tuber- times fronto-orbital width. Post-frontal lobes cles along superior margin; propodus of equal in breadth, median pair placed slightly in third walking leg slender, more than 3 advance of lateral pair, rugose anteriorly; times width........N. hirsutus sp. nov. laterals bounded anteriorly by low polished — Dactyl of male cheliped with 6–10 tubercles granules. Regions: gastric region moderately along superior margin; propodus of third well defined; low slightly rugose ridge separ - walking leg stouter, less than 3 times width. ating urogastric and cardiac regions; protogastric ........................2 lobe extending forward as a groove, becoming 2. Pectinate crest on upper surface of palm of deep and narrow between median postfrontal male cheliped short, consisting of c. 18 lobes; cardiac and intestinal regions moderate - horny teeth; dactyl of male cheliped with ly defined. Carapace with dense covering of 9–10 tubercles ................ curved bristles and longer setae, often irregu - .......N. gemmiferum (Tweedie, 1936) larly tufted; surface smooth, with scattered — Pectinate crest long, consisting of c. 60 horny teeth; dactyl of male cheliped with puntations. Dense setation extends onto pereio - 6–9 tubercles along superior margin .... pods, except for undersurface of meri of walking .....N. rectipectinatum (Tweedie, 1950) legs, lower and inner faces of palm of cheliped, and distally on fingers of chelae. Neosesarma gemmiferum (Tweedie, 1936) Chelipeds robust, equal; chela c. 1.7 times dactylus length. Merus with upper border (Figs 1, 2, 6A, B) bearing small sub-distal tooth; outer surface Sesarma gemmifera Tweedie, 1936: 58–61, text-fig. 2, covered in transverse squamiform markings, pl. 15, fig. 1; 1950: 342, fig. 1d. and sparsely scattered setae; inner border Neosesarma gemmiferum — Serène & Soh 1970: 394, expanded and flattened distally, rounded or 405, pl. 2A, B; Ng et al. 2008: 222 (in list). % obtusely angled, margin bluntly denticulate. Material examined. LECTOTYPE (here designated), Palm with single longitudinal pectinate crest of (22.3 × 20.3 mm), NHM-1947.11.18.20, Johore Strait, Singapore, mangrove swamps, Oct. 1934, M.W.F. about 18 fine horny teeth, continued each end Tweedie. PARALECTOTYPE, & (24.6 × 23.2 mm), as granular crest (in female reduced to simple NHM-1947.11.18.19, Johore Strait, Singapore, mangrove granular crest over entire length); upper two- swamps, Oct. 1934, M.W.F. Tweedie. Other material: thirds of outer surface sparsely to coarsely MNHN-B21500, 2 % (27.1 × 24.5; 27.1 × 24.7 mm), granular, often covered with setae on especially river at Ama Keng, Singapore, C.L. Soh, 17.11.1965; % & in smaller males, but setae may become sparse QM-W25704, (20.4 × 18.8 mm); (19.7 × 17.7 mm), in large males and females; lower third and Sungei Buloh, Singapore, mangroves, C. Schubart & Sivasothi, 6.08.1999. ZRC-1987.562, % (25.5 × 21.7 ventral surface without setae, punctate, with mm), Kranji, Singapore, mangroves, Peter Ng, 1983. some obliquely disposed squamiform markings QM-W14836, & (19.0 × 16.3 mm), end of Lim Chu proximo-ventrally; inner surface coarsely 222 Memoirs of the Queensland Museum | Nature 2012 56(1) Revision of Neosesarma FIG. 1. Neosesarma gemmiferum (Tweedie, 1936). A–D: Lectotype male, (NHM-1947.11.18.20); E, F: Paralectotype female (NHM-1947.11.18.19). A, dorsal view; B, frontal view of male carapace and claws; C, magnified lateral view of cheliped dacylar tuberculation; D, sternum and male abdomen; E, frontal view of female carapace and claws; F, female abdomen. Memoirs of the Queensland Museum | Nature 2012 56(1) 223 Davie FIG. 2. Neosesarma gemmiferum (Tweedie, 1936). % (27.1 × 24.5 mm), MNHN-B21500, Singapore. A, frontal view of male chela; B, dorsal view of dactylar tuberculation of male chela. granular, granules not extending onto fixed selves being pale yellow. This contrast in colour finger. Dactylus slightly incurved, moderate ... gives the tubercles the appearance of being ... gape between fingers. Upper margin, on as gems are set in a ring.’ (Tweedie 1936). mature males, with 9–10 tubercles, distal 2 or 3 Remarks. Males of this species are easily small and indistinct; tubercles all isolated, each identified by the 9–10 characteristically shaped surrounded at base by raised rim; longitudin - dactylar tubercles on the claw, and the presence ally oval in dorsal view, proximal slope longer of c. 18 horny teeth forming the pectinate crest (Fig. 2); 2 transverse grooves on proximal slope on the upper surface of the chela (the other (Fig. 1C). Female chela with 5–6 very small three species each have more than 20). The male dactylar tubercles, confined to basal half. G1 is also distinctive, but of the other described Walking legs relatively short; with dense species, it is most similar to N. hirsutus sp. nov. covering of setae; broad meri armed with (cf. Fig. 6A, B with 6G–I). anterior sub-distal spine. Third leg: merus c. Distribution. Singapore: Johore Strait; Seran - 1.9–2.1 times longer than wide; combined goon River. Malaysia: Port Swettenham, Selangor length of carpus and propodus slightly longer (Tweedie 1936). Kuching, Sarawak (Tweedie than merus (c. 1.1 times); propodus c. 2.9 times 1950). longer than wide. Habitat. Mangrove associated; in soft muddy Male abdomen with telson c. 1.1 times longer areas; log infaunal, and often associated with than wide; length 1.1–1.2 times length of crevices in trees and fallen logs.
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