Miersarma granosimanum ( Miers, 1880 )

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 : 961-962

Miersarma granosimanum ( Miers, 1880)

( Figs. 24A, B , 25J , 29 A, 31 D, E, 32 D, 40 , 44 I)

Sesarma granosimana Miers, 1880: 24 , pl. 14 fig. 3; De Man, 1887: 644; Tweedie, 1940: 92; Tweedie, 1950: 343, fig. 2a.

Sesarma (Sesarma) granosimana – De Man, 1895: 143.

Sesarma (Holometopus) granosimana – Tesch, 1917: 155; Roux, 1933: 10; Serène, 1968: 107.

Pseudosesarma granosimanum – Ng et al., 2008a: 222.

Material examined. Lectotype (here designated): male (16.9 × 14.8 mm) ( NHM 1880.6 ), Borneo, purchased by E. Gerrard from Dr. P. Bleeker collection. PENINSULAR MALAYSIA – 5 males, 8 females ( ZRC 2002.0162 ), Malaysia, Johor, Muar, Tanjong Olak, Bukit Pasir, coll. Y.Y. Goh, 28 May 1998; 46 females, 33 males ( ZRC 1973.11.2.191–268), near Sedili River, Johor, Sungei Kayu, swamp forest, coll. 1937; 7 males, 2 females ( ZRC 1965.7.29.164–173), Sungei Kayu , swamp forest near Sedili River , Johor, coll. February 1937; 1 male ( ZRC 1965.7.29.174), Sedili River , Johor, coll. October 1937; 2 males, 2 females ( ZRC 1965.7.29.175–178), Kota Tinggi , Johor, no date. SARAWAK – 4 males, 2 females ( ZRC 1965.7.29.179–184), Kuching , freshwater ditch, coll. M.W.F. Tweedie, December 1948.

Diagnosis. Carapace squarish; no epibranchial tooth present, lateral margin entire; posterolateral margins subparallel; outer surface of chela gently convex, covered with small squamiform granules, ventral margin of palm sinuous, serrated; suture between male thoracic sternites 3 and 4 undiscernible; male pleon broadly triangular; male sternopleonal cavity without press-button of pleonal locking mechanism on sternite 5; G1 slender, straight, relatively long chitinous distal part bent at almost right angles.

Colour. Not known.

Remarks. In Miersarma granosimanum , the entire surface of sternites 1–4 appears almost contiguous, without any trace of a ridge or suture. However, this surface is uneven and when dried, the separation between sternites 2 and 3 can just about be discerned.

The G1 is characteristically long and slender, with an elongate distal part. The G1 is somewhat twisted; viewed from one angle, it appears almost straight (e.g., Fig. 40B, C, J ), but when slightly adjusted, it appears distinctly sinuous ( Fig. 40F, G ). In the lectotype male, the G1 is in poor condition and slightly shrivelled, the subdistal part of the G1 appears slightly damaged, with a small flange visible ( Fig. 40D, E ).

Roux’ (1933) record of the species from Palembang in Sumatra cannot be confirmed. It is retained as a synonym of M. granosimanum until the specimens can be re-examined.

Biology. Tweedie (1940: 92) writes that he obtained a “good series from fresh-water swamp-forest near the river Sedili, Johor. A single specimen from among nipah palms beside the river Sedili, where the water is slightly saline”. The more recent specimens from Muar (ZRC 2002.0162) were collected from behind a mangrove.

Distribution. Known from Peninsular Malaysia, Borneo, and Sumatra ( Roux, 1933; Tweedie, 1940, 1950).

Figures

Fig. 24. Overall habitus. A, Miersarma granosimanum, lectotype male (16.9 × 14.8 mm) (NHM 1880.6), Borneo; B, Miersarma granosimanum, male (22.5 × 19.2 mm) (ZRC 1965.7.29.164), Sedili River, Johor, Malaysia; C, Manarma moeschii, male (18.2 × 16.3 mm) (ZRC 2000.1926), Thailand; D, Manarma johorense, male (14.6 × 12.6 mm) (ZRC 1971.9.24.14), Seletar River, Singapore; E, Bresedium laevimanum, lectotype male (20.0 × 17.6 mm) (MNHG), Borneo; F, Bresedium laevimanum, male (26.3 × 23.7 mm) (NHM) (lectotype of Sesarma sediliensis), Johor, Malaysia; G, Bresedium laevimanum, male (18.1 × 16.4 mm) (ZRC 1972.3.7.25), Sarawak, Borneo; H, Bresedium laevimanum, male (21.2 × 18.2 mm) (ZRC 1965.7.29.121), Johor, Malaysia.

Fig. 25. Frontal view of cephalothorax of Pseudosesarma. A, P. edwardsii, lectotype male (17.5 × 16.1 mm) (RMNH-D17a), Mergui Archipelago; B, P. edwardsii, male (13.4 × 11.9 mm) (ZRC 1965.8.2.81), Pulau Pawai, Singapore; C, P. crassimanum, male (15.9 × 14.5 mm) (RMNH-D23313), Singapore; D, P. anteactum, holotype male (16.7 × 14.7 mm) (ZRC 2016.0602), Sri Lanka; E, P. glabrum, holotype male (13.8 × 12.0 mm) (CUSAT 2016-1), Kerala, India; F, P. brehieri, holotype male (17.4 × 15.7 mm) (ZRC 2016.0593), Myanmar; G, P. boulengeri, lectotype male (26.9 × 23.5 mm) (NHM 1919.11.14.1), Basra, Iraq; H, Contusarma bocourti, male (25.3 × 23.3 mm) (ZRC 2000.0952), Bangkok, Thailand; I, Contusarma cheirogonum, neotype male (24.5 × 21.5 mm) (ZRC 1995.225), Bako National Park, Sarawak; J, Miersarma granosimanum, lectotype male (16.9 × 14.8 mm) (NHM 1880.6), Borneo.

Fig. 29. Outer view of chela. A, Miersarma granosimanum, lectotype male (16.9 × 14.8 mm) (NHM 1880.6), Borneo; B, Manarma moeschii, male (18.2 × 16.3 mm) (ZRC 2000.1926), Thailand; C, Manarma johorense, male (14.6 × 12.6 mm) (ZRC 1971.9.24.14), Seletar River, Singapore; D, Bresedium laevimanum, lectotype male (20.0 × 17.6 mm) (MNHG), Borneo; E, Bresedium laevimanum, male (26.3 × 23.7 mm) (NHM) (lectotype of Sesarma sediliensis), Johor, Malaysia; F, Bresedium laevimanum, male (18.1 × 16.4 mm) (ZRC 1972.3.7.25), Sarawak.

Fig. 31. Male anterior thoracic sternum and pleon. A, Contusarma bocourti, male (25.3 × 23.3 mm) (ZRC 2000.0952), Bangkok, Thailand; B, Contusarma cheirogonum, male (15.3 × 14.0 mm) (ZRC 2011.0924), Pulau Tioman, Malaysia; C, Contusarma cheirogonum, neotype male (24.5 × 21.5 mm) (ZRC 1995.225), Bako National Park, Sarawak; D, Miersarma granosimanum, lectotype male (16.9 × 14.8 mm) (NHM 1880.6), Borneo; E, Miersarma granosimanum, male (22.5 × 19.2 mm) (ZRC 1965.7.29.164), Sedili River, Johor, Malaysia; F, Bresedium laevimanum, lectotype male (20.0 × 17.6 mm) (MNHG), Borneo; G, Bresedium laevimanum, male (26.3 × 23.7 mm) (NHM) (lectotype of Sesarma sediliensis), Johor, Malaysia; H, Bresedium laevimanum, male (21.2 × 18.2 mm) (ZRC 1965.7.29.121), Johor, Malaysia.

Fig. 32. Male sternopleonal cavity. A, Pseudosesarma edwardsii, male (20.8 × 18.6mm (ZRC 2003.0084), Pulau Tekong, Singapore; B, Pseudosesarma crassimanum, male (15.1 × 13.3 mm) (ZRC 2000.1768), Sungei Benut, Johor, Malaysia; C, Contusarma cheirogonum, male (15.3 × 14.0 mm) (ZRC 2011.0924), Pulau Tioman, Malaysia; D, Miersarma granosimanum, male (22.5 × 19.2 mm) (ZRC 1965.7.29.164), Sedili River, Johor, Malaysia. Arrow indicates shallow depression on somite 5 to accept G1 tip when pleon closed (depression absent in Miersarma, D).

Fig. 40. Miersarma granosimanum. A–E, lectotype male (16.9 × 14.8 mm) (NHM 1880.6), Borneo; F–I, male (22.5 × 19.2 mm) (ZRC 1965.7.29.164), Sedili River, Johor, Malaysia; J, male (19.5 × 16.7 mm) (ZRC 1965.7.29.165), Sedili River, Johor, Malaysia. A, male pleon; B, F, left G1 (ventral view, denuded); C, G, J, left G1 (dorsal view, denuded); D, H, left distal part of G1 (ventral view, denuded); E, I, left distal part of G1 (dorsal view, denuded). Scales: A = 5.0 mm; B, C, F, G, J = 1.0 mm; D, E, H, I = 0.5 mm.

Fig. 44. Vulva. A, Pseudosesarma edwardsii, female (16.5 × 15.3 mm) (ZRC 2016.0608), Malaysia; B, Pseudosesarma crassimanum, female (15.9 × 13.8 mm) (ZRC 2000.1768), Malaysia; C, Pseudosesarma crassimanum, female (18.0 × 15.7 mm) (ZRC 2017.1045), Thailand; D, Pseudosesarma anteactum, paratype female (17.5 × 15.4 mm) (ZRC 2016.0603), Sri Lanka; E, Pseudosesarma brehieri, paratype female (14.9 × 13.4 mm) (ZRC 2016.0594), Myanmar; F, Pseudosesarma boulengeri, female (24.2 × 20.0 mm) (ZRC 2014.0335), Iran; G, Contusarma bocourti, female (21.1 × 19.0 mm) (ZRC 2019.1114), Thailand; H, Contusarma cheirogonum, female (26.6 × 23.0 mm) (ZRC 1964.9.28.127), Sarawak; I, Miersarma granosimanum, female (20.1 × 16.4 mm) (ZRC 1965.7.29.166), Malaysia; J, Manarma moeschii, female (19.3 × 17.3 mm) (ZRC 2017.0170), Thailand.