Gelasimus borealis ( Crane, 1975 )

Shih, Hsi-Te, Wong, Kingsley J. H., Chan, Benny K. K., Nguyen, Thanh Son, Do, Van Tu, Ngo, Xuan Quang & Hsu, Pei-Yi, 2022, Branchipolynoe onnuriensis Kim & Choi & Eyun & Kim & Yu 2022, sp. nov., Zoological Studies 61 (66), pp. 1-24 : 9-10

Gelasimus borealis ( Crane, 1975) ( Fig. 3G, H )

Uca (Thalassuca) vocans borealis Crane, 1975: 89 , 597, fig. 64A (type locality: Hong Kong); Dai et al. 1986: 424, pl. 58(8).

Uca (Thalassuca) borealis – Dai and Yang 1991: 464, pl. 58(8).

Uca borealis – Jones and Morton 1994: 22, fig. 4, pls. 2E, F, 3A, B; Kosuge et al. 1997: 182; Do and Hoang 2002: 128; Do and Hoang 2004: 15; Do and Hoang 2006: 37; Hoang et al. 2010: 156; S-L Yang et al. 2008: 807; Shih et al. 2010b: 6, 8; Do et al. 2021: 102, fig. 4(3); Hoang et al. 2021: 116.

Uca vocans – Do and Hoang 2002: 128; Do and Hoang 2004: 15; Do and Hoang 2006: 36.

Uca (Gelasimus) borealis – Ng et al. 2008: 240; Shih et al. 2016a: 63, fig. 3A–D; Le et al. 2018: 41.

Gelasimus borealis – Shih et al. 2015: 200, figs. 162–167; Shih et al. 2016b: 151, 169, fig. 7A; Ng et al. 2017: 125; Sasaki 2019: 12445; Wada 2019: e142; Nguyen et al. 2022: 39.

Gelasimus (Gelasimus) borealis – Rosenberg 2019: 734.

Material examined: Quang Ninh: 1 ò (21.1 mm) (NCHUZOOL 15121), 1 ñ (14.4 mm) (NCHUZOOL 15122), 7 òò (11.5– 18.3 mm), 2 ññ (13.6, 13.8 mm) (NCHUZOOL 15123), Dong Rui, coll. H.- T. Shih and P.-Y. Hsu, 9 Oct. 2017. Hai Phong: 1 ñ (16.1 mm) (NCHUZOOL 15120), Xuan Dam, Cat Ba Island, coll. B. K. K. Chan, 23 Nov. 2011.

Distribution: Northern Vietnam, South China (including Hainan), Taiwan (including Penghu) and main islands of Japan.

Remarks: Gelasimus borealis is distributed in East Asia, showing a continental distribution ( Shih 2012a), from northern Vietnam, South China, western Taiwan to main island of Japan ( Shih et al. 2010b). This species shares a similar distribution pattern with Austruca lactea and Tubuca arcuata , but remains absent in Korea and the Ryukyus ( Shih 2012a; Shih et al. 2016a). Genetic evidence derived from COI sequences do not support differentiation of several species under the Gelasimus vocans species complex ( G. borealis , G. dampieri ( Crane, 1975) , G. vocans and G. vomeris (McNeill, 1920)) , but they are nevertheless morphologically distinct in terms of form of male major chelae and G1s, as well as female vulvae ( Shih et al. 2010a). The external morphologies of females, however, are not useful in species identification ( Crane 1975; Shih et al. 2015).

Figures

Fig. 3. Dorsal view of carapace and frontal view of major cheliped. Austruca annulipes (A, B, specimens not catalogued, Phu Quoc Island, Kien Giang); A. lactea (C, D, NCHUZOOL 15115, CW 13.1 mm, Nam Dinh); A. perplexa (E, F, NCHUZOOL 15117, CW 10.3 mm, Can Gio, Ho Chi Minh City); Gelasimus borealis (G, H, NCHUZOOL 15121, CW 21.1 mm, Dong Rui, Quang Ninh).