Pseudosesarma boulengeri ( Calman, 1920 )

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 : 952

Pseudosesarma boulengeri ( Calman, 1920)

( Figs. 22H , 25G , 27H , 30H , 37J–O , 44 F)

Chiromantes boulengeri Calman, 1920: 63 , fig. A.

Sesarma (Holometopus) boulengeri – Serène, 1968: 107.

Chiromantes boulengeri – Ng & Liu, 1999: 229; Apel & Türkay, 1999: 133; Apel, 2001: 116; Naderloo & Schubart, 2009: 61; Naderloo, 2011: 15, figs. 6a–f, 7a, b; Naderloo & Turkäy, 2012: 47 ; Naderloo, 2017: 348, figs. 31.1, 31.2, 31.6, 31.11a.

“ Chiromantes ” boulengeri – Ng et al., 2008a: 220.

Material examined. Lectotype male (26.9 × 23.5 mm) ( NHM 1919.11.14.1), Basra, Ashar Creek , Iraq (Mesopotamia), coll. C.L. Boulenger. Paralectotypes – 1 male (21.0 × 17.8 mm), 1 ovigerous female (23.8 × 20.4 mm, 26.7 × 22.4 mm) ( NHM 1919.11.14.2–4) (same data as lectotype). Others: IRAQ – 1 male, 1 female ( NHM 1892.9.16.7.20), Fao; 1 male ( NHM 1999.124 ), Fao. IRAN – 3 males ( ZUTC Brach 1151), Bahmanshir River, coll. E. Gholinezhad, summer 2006 ; 1 male, 1 female ( ZUTC Brach 1153), Bahmanshir River, coll. E. Gholinezhad, summer 2006; 16 males, 25 females (16 ovigerous), 3 juveniles ( SMF 33818), 2 males, 2 females ( ZRC 2014.0335 ), Abadan , Bahmanshir River, Pole Tanki Abolhassan, 30°21′01.5″N 48°18′35.9″E, coll. R. Naderloo & A. Kazemi, 20 May 2008 .

Diagnosis. Carapace squarish; epibranchial tooth absent, lateral margin entire; posterolateral margins gently converging towards posterior carapace margin; outer surface of chela gently convex, covered with large rounded granules in adults, ventral margin of palm sinuous, unarmed; male pleon triangular, appears more elongate; suture between male thoracic sternites 3 and 4 distinct; male sternopleonal cavity with press-button of pleonal locking mechanism on sternite 5; distal part of G1 gently swollen with main chitinous part forming beak-like structure and smaller projection basally. In life, chelae beige to cream.

Colour. In life, the carapace and appendages are cream to buff, with the dorsal surface of the carapace possessing darker blotches ( Fig. 56H ) (see also Naderloo, 2011: 7 a, b; Naderloo, 2017: fig. 31.1).

Remarks. The taxonomy of this species has been treated at length by Naderloo & Schubart (2009).

Biology. In Iran, the species lives in burrows along the muddy banks of rivers subject to tidal influence ( Naderloo & Schubart, 2009). The type from Iraq, however, was found in Ashar Creek, 96 km from the sea, and presumably freshwater ( Calman, 1920).

Distribution. Iraq and Iran, Persian Gulf ( Calman, 1920; Naderloo & Schubart, 2009).

Figures

Fig. 22. Overall habitus, Pseudosesarma species. 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. edwardsii, male (12.9 × 11.8 mm) (ZRC 1971.9.24.9), Singapore; D, P. crassimanum, male (15.9 × 14.5 mm) (RMNH-D23313), Singapore; E, P. anteactum, holotype male (16.7 × 14.7 mm) (ZRC 2016.0602), Sri Lanka; F, P. glabrum, holotype male (13.8 × 12.0 mm) (CUSAT 2016-1), Kerala, India; G, P. brehieri, holotype male (17.4 × 15.7 mm) (ZRC 2016.0593), Myanmar; H, P. boulengeri, lectotype male (26.9 × 23.5 mm) (NHM 1919.11.14.1), Basra, Iraq.

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. 27. Outer view of chela 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. edwardsii, male (19.4 × 17.3 mm) (ZRC 1971.9.24.8), Singapore; D, P. crassimanum, male (15.9 × 14.5 mm) (RMNH-D23313), Singapore; E, P. anteactum, holotype male (16.7 × 14.7 mm) (ZRC 2016.0602), Sri Lanka; F, P. glabrum, holotype male (13.8 × 12.0 mm) (CUSAT 2016-1), Kerala, India; G, P. brehieri, holotype male (17.4 × 15.7 mm) (ZRC 2016.0593), Myanmar; H, P. boulengeri, lectotype male (26.9 × 23.5 mm) (NHM 1919.11.14.1), Basra, Iraq.

Fig. 30. Male anterior thoracic sternum and pleon 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. glabrum, holotype male (13.8 × 12.0 mm) (CUSAT 2016-1), Kerala, India; E, P. anteactum, holotype male (16.7 × 14.7 mm) (ZRC 2016.0602), Sri Lanka; F, P. anteactum, paratype male (21.2 × 19.7 mm) (ZRC 2016.0603), Sri Lanka; G, P. brehieri, holotype male (17.4 × 15.7 mm) (ZRC 2016.0593), Myanmar; H, P. boulengeri, lectotype male (26.9 × 23.5 mm) (NHM 1919.11.14.1), Basra, Iraq.

Fig. 37. A–G, Pseudosesarma brehieri, paratype female (14.9 × 13.4 mm) (ZRC 2016.0594), Myanmar; F, G, P. brehieri, male (15.0 × 13.6 mm) (ZRC 2013.0209), West Bengal, India; H, I, P. brehieri, male (14.5 × 13.0 mm) (ZRC 2013.0209), West Bengal, India; J–O, P. boulengeri, lectotype male (26.9 × 23.5 mm) (NHM 1919.11.14.1), Basra, Iraq. A, K, male pleon; B, F, L, left G1 (ventral view, denuded); D, G, M, left G1 (dorsal view, denuded); E, left G2; H, O, left distal part of G1 (dorsal view, denuded); I, N, left distal part of G1 (ventral view, denuded); J, anterior thoracic sternites 1–4. Scales: A = 4.0 mm; B–E, N, O = 1.0 mm; F–I = 0.5 mm; J, K = 5.0 mm; L, M = 2.0 mm. A–E, after Ng (2018: fig. 7E–I).

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.

Fig. 56. Colour in life. A, B, Pseudosesarma edwardsii, male (20.5 × 19.3 mm) (ZRC 2016.0608), Langkawi [photograph: Paul Ng]; C–E, P. edwardsii, male (19.4 × 18.2 mm) (SMF), Langkawi, Peninsular Malaysia [photograph: CD Schubart]; F, G, P. crassimanum, (12.6 × 10.5 mm) (ZRC 2010.0035), Tioman, Peninsular Malaysia [photograph: PKL Ng]; H, P. boulengeri, specimen not preserved [photograph: Reza Naderloo].