Manarma johorense ( Tweedie, 1940 )

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 : 964-966

Manarma johorense ( Tweedie, 1940)

( Figs. 24D , 26B , 29C , 33B, E , 41F–J )

Sesarma johorensis Tweedie, 1940: 103 , fig. 9, pl. 24-3; Tweedie, 1950: 342.

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

Pseudosesarma johorense – Tan & Ng, 1994: 82.

“ Pseudosesarma ” johorense – Ng et al., 2008a: 220.

Material examined. Paratypes: male (10.0 × 8.5 mm), 1 female (9.6 × 8.3 mm) ( ZRC 1965.7.29.189–190), Pendas River , southern Johor, Peninsular Malaysia, coll. M.W.F. Tweedie, February 1937 ; 1 female (11.2 × 9.1 mm) ( ZRC 1970.3.13.2), Pendas River , southern Johor, Peninsular Malaysia, coll. M.W.F. Tweedie, February 1937 . Others : SINGAPORE – 1 male (14.6 × 12.6 mm) ( ZRC 1971.9.24.14), Sungei Seletar , coll. C.L. Soh, 31 December 1966 ; 1 female ( ZRC 1971.9.24.13), Simpang River , Mak Wai, Singapore, coll. C.L. Soh, 3 March 1966 ; 1 female ( ZRC 1971.9.22.8), Simpang River , Mak Wai, coll. C.L. Soh, 20 December 1966 ; 1 female ( ZRC 1973.11.2.496), Sungei Seletar , coll. 14 June 1967 ; 3 males ( ZRC 1971.9.24.12), Sungei Seletar , coll. C.L. Soh, 31 December 1966 ; 1 juvenile ( ZRC 1970.2.23.4), Sungei Seletar , coll. C.L. Soh, 31 December 1966 ; 1 female ( ZRC 1970.2.23.1), Sungei Seletar , coll. C.L. Soh, 11 December 1966 ; 1 male ( ZRC 1971.9.22.9), Sungei Seletar , coll. C.L. Soh, 31 December 1966 ; 1 female ( ZRC 1971.9.24.11), Sungei Seletar , coll. C.L. Soh, 31 December 1966 . PENINSULAR MALAYSIA – 1 female ( ZRC 1965.7.29.57), Sedili River , Johor, March 1938 . LABUAN – 4 males ( ZRC 1965.7.29.185–188), coll. M.W.F. Tweedie, 1938. VIETNAM – 1 male ( ZRC 1969.10.1.4), Cantho , coll. Nguyen Thi Lai, August 1969 ; 2 juveniles ( ZRC 1970.2.23.2–3), Cantho , coll. Institute of Oceanography, Nhatrang, 1958 .

Diagnosis. Dorsal surface of carapace relatively flatter, regions relatively less prominent; fingers of cheliped relatively shorter in adult males; male pleonal somite 6 relatively longer, telson more rounded; distal chitinous part of G1 gently curved distally. In life, carapace uniform dark brown.

Colour. According to Tweedie (1940: 105), the “colour of the carapace is very dark greenish brown and of the chelae, pale yellow”.

Remarks. The differences between M. johorensis and M. moeschii have been discussed under the latter species.

Biology. The species lives in mangrove swamps near the main river ( Tweedie, 1940: 103).

Distribution. Known only from southern Peninsular Malaysia, Sarawak, and Vietnam ( Tweedie, 1940, 1950; present data).

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. 26. Frontal view of cephalothorax. A, Manarma moeschii, male (18.2 × 16.3 mm) (ZRC 2000.1926), Thailand; B, Manarma johorense, male (14.6 × 12.6 mm) (ZRC 1971.9.24.14), Seletar River, Singapore; C, Bresedium laevimanum, lectotype male (20.0 × 17.6 mm) (MNHG), Borneo; D, Bresedium laevimanum, male (26.3 × 23.7 mm) (NHM) (lectotype of Sesarma sediliensis), Johor, Malaysia.

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. 33. A–E, male anterior thoracic sternum and pleon; F–H, left ambulatory leg. A, D, H, Manarma moeschii, male (18.2 × 16.3 mm) (ZRC 2000.1926), Thailand; B, E, M. johorense, male (14.6 × 12.6 mm) (ZRC 1971.9.24.14), Seletar River, Singapore; C, F, Orisarma intermedium, male (34.7 × 31.6 mm) (ZRC 2001.0034), Pingtung, Taiwan; G, O. patshuni (, male (14.2 × 13.0 mm) (ZRC 1998.345), Hong Kong.

Fig. 41. A–E, Manarma moeschii, male (20.2 × 18.0 mm) (ZRC 2000.1926), Thailand; F–J, M. johorense, male (14.6 × 12.6 mm) (ZRC 1971.9.24.14), Seletar River, Singapore. A, F, male pleon; B, G, left G1 (ventral view, denuded); C, H, left G1 (dorsal view, denuded); D, I, left distal part of G1 (ventral view, denuded); E, J, left distal part of G1 (dorsal view, denuded). Scales: A = 5.0 mm; B, C, G, H = 1.0 mm; F = 2.0 mm; D, E, I, J = 0.5 mm.