Pseudosesarma anteactum Ng & Schubart 2017
Creators: name: Schubart, Christoph D.
name: Ng, Peter K. L.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Sesarmidae
Pseudosesarma
Pseudosesarma anteactum

description: Pseudosesarma anteactum Ng & Schubart, 2017
(Figs. 22E, 25D, 27E, 30F, 36A–G, 44 D)
Sesarma edwardsii – Alcock, 1900: 416 (part). [not Sesarma edwardsii De Man, 1887]
Sesarma (Sesarma) edwardsi crassimana – Ingle & Fernando, 1963: 101, figs. 1, 2a, b. [not Sesarma edwardsii var. crassimana De Man, 1887]
Pseudosesarma crassimanum – Bouillon et al., 2004: 84; Dahdouh-Guebas et al., 2011: 192. [not Sesarma edwardsii var. crassimana De Man, 1887]
Pseudosesarma anteactum Ng & Schubart, 2017: 664, figs. 14–17.
Material examined. Holotype male (16.7 × 14.7 mm) (ZRC 2016.0602), Colombo, Sri Lanka, coll. R. Serène, 12 October 1972. Paratypes: 3 males (21.2 × 19.7 mm, 17.2 × 15.9 mm, 14.1 × 12.2 mm), 2 females (17.5 × 15.4 mm, 15.7 × 14.2 mm) (ZRC 2016.0603), same data as holotype.
Diagnosis. Carapace transversely rectangular; frontal margin relatively wide, median concavity separating lobes distinct; epibranchial tooth distinct, separated from rest of margin by deep notch; posterolateral margins subparallel; outer surface of chela gently convex, covered with closely packed rounded granules, ventral margin of palm gently convex, lined with rounded granules, not denticulate, fingers relatively short; suture between male thoracic sternites 3 and 4 distinct; male pleon broadly triangular; male sternopleonal cavity with press-button of pleonal locking mechanism on sternite 5; distal half of G1 gently swollen, wider than proximal part, median part appears gently constricted, chitinous part forming relatively wide beak-like structure. In life, chela red, not extending beyond base of fingers.
Colour. Ingle & Fernando (1963: 102) described the palm of the cheliped as red but with the colour not extending beyond the base of the fingers.
Remarks. The species was described and figured in detail by Ng & Schubart (2017). The species is most similar to P. crassimanum in most of its external features but the ventral margin of the palm of P. anteactum is gently convex rather than concave (Fig. 27E versus Fig. 27D); and the median part of the G1 gently constricted with the proximal and subdistal parts dilated, the distal chitinous part being relatively wider and more truncate (Fig. 36A–G) (versus the G1 subdistal part is more dilated than the relatively more slender proximal parts, and the distal chitinous part is proportionately narrower, being more acute and beak-like in P. crassimanum; Fig. 35B–F, H–L, O–R).
Biology. The specimens of Ingle & Fernando (1963: 101) were from a brackish water canal in Kirillapone, a low-lying area just 5–6 km west of the main coastal city of Colombo. The types were from somewhere in Colombo. This fits the general habitat preference for many Pseudosesarma species.
Distribution. The species is known only from Sri Lanka thus far (Ng & Schubart, 2017).
description: Published as part of 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, pp. 891-994 in Raffles Bulletin of Zoology 68 on pages 948-949, DOI: 10.26107/RBZ-2020-0097, http://zenodo.org/record/5351295