Migmarma modestum ( De Man, 1902 )

Schubart, Christoph D. & Ng, Peter K. L., 2020, Revision of the intertidal and semiterrestrial crab genera Chiromantes Gistel, 1848, and Pseudosesarma Serène & Soh, 1970 (Crustacea: Brachyura: Sesarmidae), using morphology and molecular phylogenetics, with the establishment of nine new genera and two new species, Raffles Bulletin of Zoology 68, pp. 891-994 : 968

publication ID	https://doi.org/10.26107/RBZ-2020-0097
publication LSID	lsid:zoobank.org:pub:815E4670-B063-4FD8-B31E-3AD89B3A7942
DOI	https://doi.org/10.5281/zenodo.6524895
persistent identifier	https://treatment.plazi.org/id/49152B56-FFAC-BA6C-FF04-FD4EFE88F8F4
treatment provided by	Diego (2021-08-29 02:57:21, last updated 2024-11-29 15:09:10)
scientific name	Migmarma modestum ( De Man, 1902 )
status

Treatment

Migmarma modestum ( De Man, 1902) View in CoL

( Figs. 45 View Fig , 46 View Fig )

Sesarma (Sesarma) modesta De Man, 1902: 511 View in CoL , pl. 19 fig. 8; Tesch, 1917: 175; Roux, 1917: 619.

Sesarma (Sesarma) modestum – Serène, 1968: 105.

Pseudosesarma modestum View in CoL – Serène & Soh, 1970: 400; Ng et al., 2008a: 222.

Material examined. Holotype: male (25.0 × 20.9 mm) ( SMF 1989 About SMF ), Ternate , Moluccas, Indonesia, coll. W. Kükenthal, 26 December 1893 – 11 June 1894.

Diagnosis. Carapace trapezoidal, wider than long; dorsal carapace surface uneven but not setose; epibranchial tooth distinct, separated by deep notch; posterolateral margins slightly divergent; outer surface of chela covered with rounded granules, those on margins relatively larger, outer surface almost flat, ventral margin of palm almost straight; suture between male thoracic sternites 3 and 4 distinct; ambulatory merus short, broad; male pleon triangular, telson relatively elongate, not sunken into distal margin of somite 6; male pleonal somite 6 relatively broader; G1 relatively stout, almost straight, chitinous distal part relatively short, stout, tip subtruncate.

Remarks. The identity of this species has long been uncertain. Serène & Soh (1970) referred it to Pseudosesarma where it has remained since, and the type has never been redescribed or refigured. Roux (1917) identified a female specimen from New Guinea to this species, but this cannot be confirmed until it can be re-examined. It is also possible that his specimen belongs to M. lustrum , new species, which is close to M. modestum but differs markedly in the form of the G1 (see next species).

References

Man JG De (1902) Die von Herrn Professor Kukenthal im Indischen Archipel gesammelten Dekapoden und Stomatopoden. In: Kukenthal W (ed.) Ergebnisse einer Zoologischen Forschungsreise in den Molukken und Borneo, in Auftrage der Senckenberg. Naturforsch. Gesellschaft ausgefuhrt von Dr. Willy Kukenthal. Abhandlungen der Senckenbergischen naturforschenden Gesellschaft, 25 (3): 467 - 929, pls. 19 - 27.

Ng PKL, Guinot D & Davie PJF (2008 a) Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, Supplement 17: 1 - 286.

Roux J (1917) Crustaces (Expedition de 1903). In: Resultats de l'Expedition scientifique Neerlandaise a la Nouvelle-Guinee en 1903. Nova Guinea, Zoologie, 5: 589 - 621, pls. 27, 28.

Serene R (1968) The Brachyura of the Indo Pacific Region. In: Prodromus for a check list of the nonplanctonic marine fauna of South East Asia. Singapore National Academy of Science, Special Publication No. 1: 33 - 112.

Serene R & Soh CL (1970) New IndoPacific genera allied to Sesarma Say 1877 (Brachyura, Decapoda, Crustacea). Treubia, 27: 387 - 416.

Tesch JJ (1917) Synopsis of the genera Sesarma, Metasesarma, Sarmatium and Clistocoeloma, with a key to the determination of the IndoPacific species. Zoologische Mededelingen, 3: 127 - 260, pls. 15 - 17.

Figures

Fig. 45. Migmarma modestum, holotype male (25.0 × 20.9 mm) (SMF 1989), Indonesia. A, overall habitus; B, dorsal view of carapace; C, frontal view of cephalothorax; D, anterior thoracic sternum and pleon; E, sternopleonal cavity; F, outer view of right chela; G, H, left G1; I–K, distal part of left G1.

Fig. 46. Migmarma modestum, holotype male (25.0 × 20.9 mm) (SMF 1989), Indonesia. A, left third maxilliped (denuded); B, pleon; C, left G1 (ventral view); D, left G1 (dorsal view); E, distal part of left G1 (ventral view); F, distal part of left G1 (mesial view); G, distal part of left G1 (dorsal view); H, distal part of left G1 (mesial view); I, left G2. Scales: A, C, D, I = 1.0 mm; B = 5.0 mm; E–H = 0.5 mm.