Thalamonyx gracilipes A. Milne-Edwards, 1873

Shaga, I Bevin, Priya, K, Ramar, Selvakumar, Srinidhi, S, Mohan, G Chandra, Ranganathan, Sukanya, Moulvi, S M M & Mani, Bhuvaneswari, 2023, A Small Collection of Subtidal Crabs (Crustacea: Decapoda: Brachyura) from the Palau Islands Collected by Dredging, Bulletin of the National Museum of Nature and Science. Series A, Zoology 49 (1), pp. 7-42 : 21-22

publication ID

https://doi.org/ 10.50826/bnmnszool.49.1_7

DOI

https://doi.org/10.5281/zenodo.13826507

persistent identifier

https://treatment.plazi.org/id/1B153E3A-FF8B-FFB4-F1EB-CB775B14FC78

treatment provided by

Felipe

scientific name

Thalamonyx gracilipes A. Milne-Edwards, 1873
status

 

Thalamonyx gracilipes A. Milne-Edwards, 1873 View in CoL

( Fig. 7C–D View Fig )

Thalamonyx gracilipes A. Milne Edwards, 1873a View in CoL , p. 169, pl. 4 fig. 3.─Alcock, 1899, p. 71.─ Rathbun, 1906, p. 873.─ Edmondson, 1954, p. 251, fig. 26.─ Crosnier, 1962, p. 91, fig. 153.

Thalamonyx danae var. gracilipes A. Milne Edwards View in CoL : Miers, 1886, p. 192.

Thalamita gracilipes (A. Milne Edwards) View in CoL : Stephenson and Rees, 1967, p. 20, fig. 2d, h.

Material examined. Inside of Gesodokkuru Reef off Arumonogui, Babelthuap I., Palau Is, dredged, ca. 20 m in depth; 1 ♂ (cb 7.6×cl 5.9 mm), NSMT-Cr 30976; July 13, 1980; K. Baba leg.

Remarks. Evans (2018) showed with the molecular analysis that the genus Thalamonyx is valid and generically distinct from the genus Thalamita . The genus Thalamonyx is represented by Goniosoma danae A. Milne-Edwards, 1869 (type species) and Thalamonyx gracilipes A. Milne-Edwards, 1873 (present species), both of which are close to each other in the general formation of the carapace, chelipeds and ambulatory legs. According to Stephenson and Rees (1967), the most conspicuous difference between the two species is the presence of four ridges in an arc on the mesobranchial and cardiac regions in Thalamonyx gracilipes , instead of no ridges on the cardiac region in T. danae .

The frontal region ( Fig. 7C View Fig ) is strongly developed forwards as a plate, with the weakly sinuate margin divided into two lobes by a median minute notch, followed laterally with a large and oblique orbit at each side. The external orbital or first anterolateral tooth is much larger than the following four subequal teeth ( Fig. 7C View Fig ). The telson of the male pleon strongly tapers and has a sharp tip ( Fig. 7D View Fig ). The G1 is represented by Stephenson and Rees (1967), with which the G1 of the present male agrees well in having the curled setae at the distal part.

Distribution. The records of occurrence are not many, only with several localities in the wide area of the Indo-West Pacific, without intervening localities (Hawaii, New Caledonia, Tonga, Cocos Keeling Island, the Andaman Islands, and Madagascar), 12–77 m in depth. New to the Palau Islands.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Portunidae

Genus

Thalamonyx

Loc

Thalamonyx gracilipes A. Milne-Edwards, 1873

Shaga, I Bevin, Priya, K, Ramar, Selvakumar, Srinidhi, S, Mohan, G Chandra, Ranganathan, Sukanya, Moulvi, S M M & Mani, Bhuvaneswari 2023
2023
Loc

Thalamita gracilipes (A. Milne Edwards)

Stephenson, W. & M. Rees 1967: 20
1967
Loc

Thalamonyx gracilipes

Crosnier, A. 1962: 91
Edmondson, C. H. 1954: 251
Rathbun, M. J. 1906: 873
1906
Loc

Thalamonyx danae var. gracilipes

Miers, E. J. 1886: 192
1886
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