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On the Identities of Sesarma Obesum Dana, 1851, and Sesarma Eydouxi H

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On the Identities of Sesarma Obesum Dana, 1851, and Sesarma Eydouxi H On the identities of Sesarma obesum Dana, 1851, and Sesarma eydouxi H. Milne Edwards, 1853 (Crustacea, Decapoda, Brachyura, Sesarmidae) Peter K. L. NG Department of Biological Sciences, National University of Singapore, Kent Ridge, Singapore 119260 (Republic of Singapore) [email protected] Christoph D. SCHUBART Biologie 1, Universität Regensburg, 93040 Regensburg (Germany) [email protected] Ng P. K. L. & Schubart C. D. 2003. — On the identities of Sesarma obesum Dana, 1851, and Sesarma eydouxi H. Milne Edwards, 1853 (Crustacea, Decapoda, Brachyura, Sesarmidae). Zoosystema 25 (3) : 425-437. ABSTRACT The identities of two poorly known species of Indo-West Pacific sesarmid crabs, which have been referred to the genus Chiromantes Gistel, 1848, are clarified. Sesarma obesum Dana, 1851, is shown to be a senior synonym of Metasesarma rousseauxi H. Milne Edwards, 1853. A neotype from northern KEY WORDS Crustacea, Borneo is designated to fix the identity of the species. Sesarma eydouxi H. Decapoda, Milne Edwards, 1853, a species supposedly described from Vietnam and not Brachyura, reported there or in the region since its description, is shown to be a junior Sesarmidae, Sesarma obesum, synonym of the Atlantic species Sesarma rectum Randall, 1840; its original Sesarma eydouxi. provenance almost certainly being incorrect. RÉSUMÉ Identités de Sesarma obesum Dana, 1851, et Sesarma eydouxi H. Milne Edwards, 1853 (Crustacea, Decapoda, Brachyura, Sesarmidae). Les identités de deux espèces peu connues de crabes Sesarmidae de l’Indo- ouest Pacifique, qui ont été rattachées au genre Chiromantes Gistel, 1848, sont clarifiées. Il est démontré que Sesarma obesum Dana, 1851, est un syno- nyme antérieur de Metasesarma rousseauxi H. Milne Edwards, 1853. Un néo- MOTS CLÉS Crustacea, type du nord de Bornéo est désigné pour fixer l’identité de l’espèce. Sesarma Decapoda, eydouxi H. Milne Edwards, 1853, espèce prétendument décrite du Viet-Nam Brachyura, et non revue dans cette région depuis sa description, est démontrée être un Sesarmidae, Sesarma obesum, synonyme plus récent de Sesarma rectum Randall, 1840 de l’Atlantique ; sa Sesarma eydouxi. provenance originale étant presque certainement incorrecte. ZOOSYSTEMA • 2003 • 25 (3) © Publications Scientifiques du Muséum national d’Histoire naturelle, Paris. www.zoosystema.com 425 Ng P. K. L. & Schubart C. D. INTRODUCTION SYSTEMATICS The identities of two Indo-West Pacific sesar- Family SESARMIDAE Dana, 1851 mid crab species have been particularly diffi- Genus Metasesarma H. Milne Edwards, 1853 cult. Sesarma obesum Dana, 1851 was originally described from Balabac off northern Borneo, Metasesarma obesum (Dana, 1851) n. comb. but the brevity of the description and small size (Figs 1-3) of the original figure has made its precise iden- Sesarma obesum Dana, 1851: 252; 1852: 356, pl. 22, tity and proper generic assignment difficult to fig. 10. ascertain. The type material of this species is no Metasesarma rousseauxi H. Milne Edwards, 1853: 188; longer extant. 1854: 158, pl. 10, figs 1, 1a-1c. — Crosnier 1965: 73, Sesarma eydouxi H. Milne Edwards, 1853 was figs 116-120. — Ng & Davie 1995: 39. described from Cochin-China (probably pre- Metasesarma granularis Heller, 1862: 522. sent day Vietnam) and was redescribed by de Man (1892). Tesch (1917) also redescribed and Metasesarma rugulosa Heller, 1865: 65. figured this species, assigning it to the genus Sesarma obesa – de Man 1887: 643. Holometopus H. Milne Edwards, 1853 (= Sesarma (Holometopus) obesa – Tesch 1917: 179. Chiromantes Gistel, 1848, fide Holthuis 1977). Sesarma (Holometopus) ?obesum – Serène 1968: 107. Serène (1968) followed Tesch (1917) and listed it under Holometopus (= Chiromantes). The spe- Chiromantes obesum – Ng & Liu 1999: 229. cies, however, has never been collected during MATERIAL EXAMINED. — Taiwan. Pingtung, Η ΘΘ the last century and has several characters 22.V.1998, coll. H.-C. Liu, 1 , 2 (ZRC 1998.399); Pingtung, 19.V.1998, coll. H.-C. Liu, 1 Η which are atypical of Indo-West Pacific sesar- (ZRC 1999.552). — Little Liu-Kiu Island, mid species. 1.VIII.1994, coll. H.-C. Liu, C. H. Wang, 1 Η, In this paper, the identities and proper syste- 2 ΘΘ (ZRC 1998.479). — Feng Chui-Sa, Pingtung, Η matic placements of the two species are resolv- 24.VI.2002, coll. P. K. L. Ng, 1 (ZRC). Guam. Pago Bay, 15-18.IV.2000, coll. P. K. L. Ng, C. ed. Sesarma obesum Dana, 1851 is shown to be H. Wang, 3 ΗΗ, 16 ΘΘ (ZRC 2000.583). — a senior synonym of Metasesarma rousseauxi Haputo, VIII.2001, coll. P. K. L. Ng, 2 ΗΗ, 1 Θ H. Milne Edwards, 1853. Sesarma eydouxi H. (ZRC 2001.744). — Dadi Beach, 31.VII.2001, coll. ΗΗ Θ Milne Edwards, 1853 is a junior subjective P. K. L. Ng, 2 , 1 ovigerous (ZRC 2001.749). Tahiti. East of Papeete, 21.XI.1996, coll. G. Paulay, synonym of the Atlantic Sesarma rectum 1 Θ (ZRC 2000.582); X.2001, coll. H.-C. Liu, Randall, 1840, and the original locality data 2 ΗΗ, 1 Θ (ZRC). associated with the type is almost certainly Australia, Christmas Island. 1939, coll. C. A. Gibson- Hill, 3 ΗΗ, 8 ΘΘ (ZRC 1966.12.2.1-10). incorrect. Measurements provided (in mm) Malaysia, Sabah. Pulau Manukan, northern Sabah, are of the carapace width and length, respec- 22.VI.2000, coll. C. D. Schubart, 1 Η, 1 Θ (ZRC tively. 2000. 1656, 1657). Specimens examined are deposited in the Indonesia. Pangandaran, 3.III.1963, coll. R. Serène, 9 ΗΗ, 4 ΘΘ (ZRC 1971.11.1.1-5), 1 Η (ZRC Muséum national d’Histoire naturelle, Paris 1971.5.3.1), 1 Η (ZRC 1971.11.1.6). — Citerjun, (MNHN); Academy of Natural Sciences of Ujung Kulon, West Java, in leaf litter, 5 m from the Philadelphia (ANSP); Zoological Reference shore, 30.VII.1993, coll. C. Stewart, 1 Η 15.2 × Θ × Collection of the Raffles Museum, National 13.3 mm, 1 15.3 13.4 mm (ZRC). University of Singapore (ZRC); Senckenberg Museum, Frankfurt am Main (SMF); Museum REMARKS of Comparative Zoology, Harvard University, Dana (1851) described Sesarma obesum from a Cambridge (MCZ); and US National Museum specimen originating from an island in Balabac of Natural History, Smithsonian Institution, Strait north of Borneo. Serène (1968: 107) in Washington DC (USNM). listing this species under Chiromantes (as 426 ZOOSYSTEMA • 2003 • 25 (3) Two species of Sesarma (Crustacea, Decapoda) FIG. 1. — Sesarma obesum Dana, 1851, original figure, after Dana (1852: pl. 22, fig. 10a). Holometopus) questioned its systematic position problems) were examined. The material is com- and indicated that it might be referred to parable to the specimen figured by Dana (1852). Metasesarma. The original figure provided of Therefore, a male specimen from the island off Sesarma obesum by Dana (1852: pl. 22, fig. 10) is Sabah was selected as the neotype of Sesarma good (Fig. 1) and confirms that the species obesum, thereby fixing the identity of this poorly should be assigned to Metasesarma. The form of known species. The neotype is a male measuring the carapace and legs strongly suggests that 14.3 × 13.5 mm (ZRC 2000.1656), collected Sesarma obesum Dana, 1851, is identical to from amongst supralittoral coral rubble on Pulau Metasesarma rousseauxi H. Milne Edwards, 1853. Manukan, northern Sabah, East Malaysia, This species is often reported from islands with Borneo, on 22 June 2000 (Figs 2; 3). This action wide gravel or sandy beaches without rivers or effectively synonymises Metasesarma rousseauxi freshwater sources, as is typical for the islands with Sesarma obesum, with the latter name having north of Borneo. Numerous specimens of this priority. Furthermore, Sesarma obesum is trans- species from the Indo-West Pacific have been ferred to Metasesarma. examined, and while the colour varies according On the basis of the identification by the late to the substrate, the lateral carapace margins of Raoul Serène, Hartnoll (1975: 308, 322) referred this species are typically straight and subparallel, specimen(s) from Tanzania with doubt to giving the carapace a squarish appearance. In lar- “Holometopus obesus”. The whereabouts of these ger specimens (e.g., the proposed neotype), specimens is not known (R. G. Hartnoll pers. however, the margins are gently convex. comm.). Whether they are what is here identified Specimens identified as Metasesarma rousseauxi as Metasesarma obesum n. comb. (and M. rous- from an island north of Sabah, relatively close to seauxi) cannot be ascertained. It is interesting to the type locality of S. obesum, the Balabac Islands note, that while the type locality of M. rousseauxi (not easily accessible nowadays due to political is the east coast of Africa (from where it has also ZOOSYSTEMA • 2003 • 25 (3) 427 Ng P. K. L. & Schubart C. D. A B C FIG. 2. — Metasesarma obesum (Dana, 1851) n. comb., neotype, Η 14.3 × 13.5 mm (ZRC 2000.1656), Pulau Manukan, Sabah; A, overall view; B, carapace; C, frontal view. 428 ZOOSYSTEMA • 2003 • 25 (3) Two species of Sesarma (Crustacea, Decapoda) A B C FIG. 3. — Metasesarma obesum (Dana, 1851) n. comb., neotype, Η 14.3 × 13.5 mm (ZRC 2000.1656), Pulau Manukan, Sabah; A, ventral view; B, left chela, outer view; C, left chela, inner view. ZOOSYSTEMA • 2003 • 25 (3) 429 Ng P. K. L. & Schubart C. D. been reported from by Crosnier [1965] and Sesarma (Holometopus) rectum – Rathbun 1918: 298, Guinot [1967], Hartnoll (1975: 307) did not pl. 82. — Holthuis 1959: 243, fig. 61, pl. 11, fig. 4. — Chace & Hobbs 1969: 182, fig. 62j. find this species in Tanzania, but instead report- ed “Holometopus obesus” from the supralittoral Sesarma (Sesarma) rectum – von Hagen 1978: 45, area of a rocky shore. This is precisely the prefer- figs 1a, 2a, 3a, 4a, 5a. red habitat of M. rousseauxi (see Ng & Davie Sesarma rectum – von Hagen 1975: 301, fig. 7. — Abele 1992: 15, figs 3b, 4b, 5d, 9.
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