Gelasimus Latreille, 1817

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

Genus Gelasimus Latreille, 1817 Gelasimus hesperiae ( Crane, 1975) ( Fig. 3C, D )

? Gelasimus tetragonon var. spinicarpa Kossmann, 1877: 52 (type locality: Red Sea); Crane 1975: 80; Rosenberg 2013: 494. Gelasimus cultrimanus – Kingsley 1880: 140, pl. 9(7) [part]. Gelasimus marionis – Kingsley 1880: 141, pl. 9(8) [part]. Uca Marionis – Nobili 1906a: 314. Uca Marionis var. nitida – Nobili 1906a: 314. Gelasimus marionis – Chhapgar 1957: 509, pl. 13p, q, s, t, v, w. Gelasimus marionis nitidus – Chhapgar 1957: 510, pl. 13r, u. Uca (Thalassuca) vocans hesperiae Crane, 1975: 89 , 92, figs. 64E,

EE (type locality: Zanzibar, Tanzania). Uca vocans – Yamaguchi 1994: 180. Uca vocans forma excisa – Al-Ghais and Cooper 1996: 421. Uca vocans hesperiae – Fransen et al. 1997: 152. Uca hesperiae – Apel and Türkay 1999: 134. Uca (Gelasimus) hesperiae – Ng et al. 2008: 240; Naderloo et al.

2015: 409. Uca (Gelasimus) vocans – Trivedi et al. 2015: 27. Gelasimus hesperiae – Shih et al. 2016: 151, 169, fig. 7C; Naderloo

2017: 416, figs. 37.13f, 37.16; Trivedi et al. 2018: 54; Sasaki

2019: 12447. Gelasimus vocans – Trivedi et al. 2018: 54; Beleem et al. 2019: 15;

Pati et al. 2022: 528, fig. 13A, B. Gelasimus (Gelasimus) hesperiae – Rosenberg 2019: 734.

Material examined: Eritrea: 2 òò (21.0, 22.0 mm), 1 major chela (SMF 5645), Sahil, Massaua, selten überspülte Schlickzone mit Salicornia-artigem Bewuchs (15°36'37.1"N, 39°28'16.1"E), coll. E. Rüppell, Jan.-Mar. 1827. Djibouti: 1 ò (18.5 mm) (MNHN-IU-2011-5608), 1 ò (20.3 mm) (MNHN- IU-2011-5607), Mission Gravier, coll. 3 Feb. 1904. India: 4 òò (13.7–18.2 mm), 1 ovig. ñ (15.8 mm) (NCHUZOOL 15094), 5 òò (14.2–19.4 mm), 3 ovig. ññ (13.5–15.9 mm) (NCHUZOOL 15095), 3 òò (12.5–13.1 mm), 2 ññ (9.3– 8.5 mm) (CASAU- CR-1012), Kali R. estuary, Karwar, Karnataka, coll. M. Prema, 4 Feb. 2021.

Distribution: South Africa to Somalia, Eritrea, Djibouti, Yemen, Oman, UAE, India, Sri Lanka, Bangladesh, Myanmar, western Thailand, Malaysia (western Malay Peninsula), Singapore and Indonesia (West Sumatra).

Remarks: Gelasimus tetragonon var. spinicarpa was established by Kossmann (1877: 52) on three males from the Red Sea. One syntype (Leiden Museum cat. no. 1493, CL 12 mm, major propodus 23 mm) was identified as a species of the Gelasimus vocans complex by Crane (1975: 80), although the other two syntypes were not examined ( Fransen et al. 1997: 152). Based on location, these Red Sea specimens would fall within Crane’s G. vocans herperiae . Rosenberg (2013) called attention to a potential homonymy between Uca spinicarpa Rathbun, 1900 and Gelasimus tetragonon var. spinicarpa Kossmann, 1877 , if both were in Uca . However, as these species are now considered to be in their original genera, no homonymy exists and G. spinimana is an available name, and potential senior synonym of G. hesperiae . Morphological examination and sequencing of Red Sea topotypical samples is needed to assess this synonymy.

The type locality of Gelasimus hesperiae is Tanzania ( Zanzibar), with additional records from Madagascar, Eritrea, Sri Lanka, western Malay Peninsula and even Sulawesi in Crane (1975: 597). In the WIO, its distribution is extended southward to South Africa (Mngazana) ( Peer et al. 2015) and eastward to Mumbai, western India ( Chhapgar 1957). COI data shows high connectivity between sampled areas in W India and Thailand.

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).