Pseudosesarma glabrum Ng, Rani & Nandan, 2017

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 : 950

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.5449855

persistent identifier

https://treatment.plazi.org/id/49152B56-FFDA-BA1A-FF53-FF0FFB02FD24

treatment provided by

Diego

scientific name

Pseudosesarma glabrum Ng, Rani & Nandan, 2017
status

 

Pseudosesarma glabrum Ng, Rani & Nandan, 2017 View in CoL

( Figs. 22F View Fig , 25E View Fig , 27F View Fig , 30D View Fig , 36H–L View Fig )

Pseudosesarma edwardsii View in CoL – Shet et al., 2016: 8, 12, fig. 2 (not Sesarma edwardsii De Man, 1887 View in CoL ).

Pseudosesarma glabrum Ng, Rani & Nandan, 2017: 265 View in CoL , figs. 2–5; Trivedi et al., 2018: 73; Apreshgi & Abraham, 2018: 96; Pati et al., 2020: 139, figs. 2–4.

Material examined. Holotype: male (13.8 × 12.0 mm) ( CUSAT 2016-1 ), mangrove forest (mixed mangrove zone with human settlements), Aroor , Cochin estuary, part of Vembanad wetland, RAMSAR site , Kerala, India, coll. V. Rani et al., 16 January 2016. Paratypes: 1 male (12.2 × 10.3 mm) ( CUSAT 2016-2 ), same data as holotype ; 1 male (16.5 × 14.5 mm) ( CUSAT 2016-3 ), same location as holotype, coll. 3 March 2017. Others : INDIA – 2 males, 1 female ( ZRC 2019.0487 View Materials ), Thejaswini River, near Palayi Kadavu, Kasaragod district , Kerala, 12.261°N 75.165°E, coll. students, 10 October 2018 GoogleMaps .

Diagnosis. Carapace slightly wider than long, width to length ratio 1.15–1.18; dorsal surface, including anterior part almost glabrous, without setae, with only short, barely visible scattered setae on posterolateral regions; frontal margin wide, median concavity separating lobes shallow; lateral margin with 1 distinct low epibranchial tooth, posterolateral margins subparallel; chela short, stout, fingers just shorter than palm, outer surface of palm with numerous small rounded granules, ventral margin of fixed finger and distal half of palm straight; suture between male thoracic sternites 3 and 4 distinct, straight; male pleon broadly triangular, somite 6 wide with distinctly convex lateral margins; male sternopleonal cavity with press-button of pleonal locking mechanism on anterior edge of sternite 5; G1 stout, distal part dilated forming bulbous structure, chitinous tip relatively broad, appearing bifurcated. In life, chela purple, not extending beyond base of fingers.

Colour. In life, the carapace is dark grey to brown with patches of lighter grey and brown; with the merus of the cheliped orange and the palm purple to dark orangish-brown and fingers white. The ambulatory legs are light brown with some parts orange ( Ng et al., 2017a: 267, fig. 5; Pati et al., 2020: fig. 2).

Remarks. Pseudosesarma glabrum was described and figured in detail by Ng et al. (2017a). It closely resembles P. crassimanum , but can easily be separated by the median cleft of the frontal margin being relatively more shallow ( Fig. 22F View Fig ), the anterior part of the dorsal surface of the carapace is almost glabrous except for a few very small scattered setae on the posterolateral regions ( Fig. 22F View Fig ), the ventral margin of the pollex and distal half of the palm of the adult chela is almost straight ( Fig. 27F View Fig ), the male pleon is relatively wider ( Fig. 30D View Fig ), and the G1 distal chitinous process is relatively shorter, wider, and appears bifurcated ( Fig. 36I–K View Fig ) (versus the median cleft of the frontal margin deeper, most of dorsal carapace surface covered with scattered but distinct stiff setae, the ventral margin of the pollex and distal half of the palm of the adult chela is distinctly concave, the male pleon is relatively narrower and the G1 distal chitinous process is beak-like, longer, and narrower in P. crassimanum ; Figs. 22D View Fig , 27D View Fig , 30C View Fig , 35 View Fig B–F, H–L, O–R).

Biology. Pseudosesarma glabrum is semi-terrestrial in habits, occurring in the intertidal mixed mangrove forests of Aroor in the Cochin estuary, Kerala, India. Sympatric sesarmids include Parasesarma plicatum ( Latreille, 1803) and Neosarmatium malabaricum ( Henderson, 1893) ( Ng et al., 2017a: 269) .

Distribution. The species was described from northern Kerala ( Ng et al., 2017a) but has since been found in other parts of Kerala state as well as in Karnataka and Maharashtra in western India ( Pati et al., 2020).

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Sesarmidae

Genus

Pseudosesarma

Loc

Pseudosesarma glabrum Ng, Rani & Nandan, 2017

Schubart, Christoph D. & Ng, Peter K. L. 2020
2020
Loc

Pseudosesarma glabrum

Pati SK & Sujila PS & Sudha Devi AR 2020: 139
Trivedi JN & Trivedi DJ & Vachhrajani KD & Ng PKL 2018: 73
Apreshgi KP & Abraham KM 2018: 96
Ng PKL & Rani V & Nandan B 2017: 265
2017
Loc

Pseudosesarma edwardsii

Shet GN & Subash Chandran MD & Ramachandra TV 2016: 8
Man JG De 1887: 950
2016
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