Gelasimus tetragonon (Herbst, 1790)

Shih, Hsi-Te, Prema, Mani, Kumar, Austin Anand Jeya, Saher, Noor Us, Ravichandran, Samuthirapandian, Odhano, Sahir & Paulay, Gustav, 2022, Fig. 9 in Fig. 1 in Fig. 20. A-E in Establishment of A New Bornean Genus of Gecarcinucidae (Crustacea: Brachyura), with Descriptions of Five New Species., Zoological Studies 61 (65), pp. 1-18 : 9-11

Gelasimus tetragonon (Herbst, 1790) ( Fig. 3E, F )

Cancer tetragonon Herbst 1790: 257 , pl. 20 (110) (type locality: unknown).

Gelasimus tetragonon – Kossmann 1877: 52; Kingsley 1880: 143, pl. 9(11); Shih et al. 2016: 151, 169, fig. 7F; Naderloo 2017: 418, figs. 37.13e, 37.18; Trivedi et al. 2018: 54; Sasaki 2019: 12450.

Uca tetragonon – Nobili 1906a: 313; Nobili 1906b: 151; Maccagno 1928: 22, figs. 7, 8; Price et al. 1987: 456; Apel and Türkay 1999: 134.

Uca (Thalassuca) tetragonon – Crane 1975: 77–81, 596, figs. 37D, 63A, B, 81F, 82E, pl. 13; Lewinsohn 1977: 59; Sakai 1999: 38, plate 20D (holotype).

Uca tetragonon – Yamaguchi 1994: 177, 184.

Uca (Gelasimus) tetragonon – Ng et al. 2008: 240; Naderloo et al. 2015: 409; El-Sayed et al. 2016: 10, pls. 3E, F, 4C, F, I, L.

Gelasimus (Mesuca) tetragonon – Rosenberg 2019: 734.

M a t e r i a l e x a m i n e d: E g y p t: 2 ò ò (19.8–32.5 mm), 1 ñ (21.1 mm) (NCHUZOOL 15096), Nabq-El Monqata, coll. S. Barbarest et al. 13 Oct. 2004. Eritrea: 1 ò (15.3 mm) (TAU EGg 3972), Dahlak Archipelago, coll. Apr. 1972.

Distribution: WIO ( Kenya, Somalia, Eritrea, Egypt (Red Sea), Saudi Arabia (Red Sea), Yemen, Oman, UAE, India), eastern Indian Ocean and West Pacific Ocean (with eastern end Gambier Islands, French Polynesia).

Remarks: Gelasimus tetragonon is widely distributed in the IWP ( Crane 1975). In the northwestern Indian Ocean , there are records from the Red Sea to the southern coasts of the Gulf of Oman and the Arabian/Persian Gulf, but not from northern coast of the Arabian/Persian Gulf to western India ( Crane 1975; Naderloo 2017; Trivedi et al. 2018; Beleem et al. 2019). COI data shows high connectivity between sampled areas from the Red Sea to China.

Figures

Fig. 3. Dorsal view of carapace and frontal view of major cheliped. Cranuca inversa (A, B, NCHUZOOL 15093, CW 19.9 mm, 18.7 mm, Saudi Arabia); Gelasimus hesperiae (C, D, MNHN-IU-2011-5608, CW 20.3 mm, Djibouti); G. tetragonon (E, F, NCHUZOOL 15096, CW 32.5 mm, Egypt); Tubuca alcocki (G, NCHUZOOL 14904, CW 19.1 mm, Saudi Arabia; H, NCHUZOOL 15097, CW 33.9 mm, Pakistan).