Eurycarcinus integrifrons De Man, 1879

Trivedi, Jigneshkumar, Mitra, Santanu, Patel, Pooja, Maheta, Niketa, Patel, Krupal & Ng, Peter K. L., 2021, On the Indian species of Eurycarcinus A. Milne-Edwards, 1867, Heteropanope Stimpson, 1858, and Pilumnopeus A. Milne-Edwards, 1867 (Decapoda: Brachyura: Pilumnidae), Nauplius (e 2021004) 29, pp. 1-18 : 5

Eurycarcinus integrifrons De Man, 1879

( Figs. 2 , 9D–F )

Eurycarcinus integrifrons De Man,1879: 55 , 56; Apel, 1994b: 415, 433, 434; Al-Ghais and Cooper, 1996: 425, 426; Apel, 2001: 97; Naderloo and Sari, 2007: 344, tab. 1; Özcan et al., 2010: 507, fig. 2; Naderloo and Türkay, 2012: 36 ; Naderloo et al., 2013: 449, 456, tab 2; Naderloo, 2017: 303, figs. 26.10b, 26.11, 26.12; Ng et al., 2018: 484, figs. 1C,3B, 4B, 5B, 6B, E, 7B, E, H, 8B, F, G; Trivedi et al., 2018: 59 (list).

Eurycarcinus orientalis — Alcock, 1898: 210, 211 (part); Chhapgar, 1957: 436, 437, pl. 11d–f; Tirmizi et al., 1986: 8–10, fig. 3a–d; Tirmizi and Ghani, 1996: 30–32, fig. 10;? Hornby, 1997: 16 (part) [not Eurycarcinus orientalis A. Milne-Edwards, 1867 ].

Litocheira (amoyensis Gordon?) — Stephensen, 1946: 169–171, fig. 46; Titgen, 1982: 252 (list) [not Litocheira amoyensis Gordon, 1931 = Heteropilumnus amoyensis (Gordon, 1931) ].

Eurycarcinus sp. (? integrifrons) — Apel and Türkay, 1992: 194–195, 204–205.

Eurycarcinus bengalensis Deb, 1999: 376 (part).

Type locality. Unknown , probably India (cf. Naderloo 2017).

Material examined. 5 males (CW 13.2–28.2 mm, CL 9.66– 9.9 mm), 5 females (CW 11.3–25.2 mm, CL 18.6– 8.14 mm), LFSC.ZRC-63, Lakhpat (23˚50’01”N 68˚46’26”E), Gujarat State, India, 27 March, 2015, coll. J. Trivedi; 2 ovigerous females (CW 13.9 mm, CL 10.4 mm; CW 21.3 mm, CL 15.3 mm), ZSI-C3349/2 (part), Chamta Block, Sunderbans Tiger Reserve , West Bengal State, India (paratypes of Eurycarcinus bengalensis Deb, 1999 ) .

Remarks. The specimens examined in the present study agree with the description and figures of the species in Ng et al. (2018). Eurycarcinus integrifrons differs from E. natalensis and E. orientalis in the following characters: carapace subquadrate ( Fig. 2A ) (transversely ovate in E. natalensis and E. orientalis ; cf. Ng et al., 2018: figs. 1A, B, C; 6A, B); frontal margin weakly bilobed ( Fig. 2B ) (distinctly bilobed in E. natalensis and E. orientalis ; cf. Ng et al., 2018: figs. 1A–C; 6A, B).

The species is so far reliably reported from Gulf of Aden, Persian Gulf, Gulf of Oman, and Pakistan ( Naderloo, 2017; Ng et al., 2018). The present study is actually the first confirmed record of the species from India, even though Naderloo (2017) suggested that the type may have originally been from there. The specimens from Gujarat (Kolak and Umarsadi) and Maharastra ( Mumbai) (recorded as E. orientalis ) in Chhapgar (1957) should be referred to E. integrifrons ; his figures leave no doubt. These records of Chhapgar (1957) thus extend the known range of E. integrifrons nearly 900 kilometers further south along the coast of western India. The two ovigerous female paratypes of E. bengalensis Deb, 1999 , are here also re-identified as E. integrifrons , extending the range of this species to West Bengal state (see remarks for next species).

Figures

Figure 2. Eurycarcinus integrifrons De Man, 1879, male (CW 28.2 mm, CL 19.9 mm) (LFSc.ZRC-63), Lakhpat, India. A, habitus, dorsal view; B, frontal view; C, anterior thoracic sternum (sternites 1–4) and pleon; D, chelae, outer view; E, posterior thoracic sternum and pleon.

Figure 9. A– C, Eurycarcinus orientalis A.Milne-Edwards,1867, male (CW41.5 mm, CL 26.9 mm) (LFSc.ZRC-64), Kamboi, India; D–F, Eurycarcinus integrifrons De Man, 1879, male (CW 28.2 mm,CL 19.9 mm) (LFSc.ZRC-63), Lakhpat,India; G–I, Eurycarcinus bengalensis Deb, 1999, holotype male (CW 25.1 mm, CL 16.9 mm) (ZSI-C3349/2), Chamta Block, India. A, D, G, ventral view of left G1; B, E, H, ventral view of distal part of left G1; C, F, I, left G2.