Austruca lactea (De Haan, 1835)

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

Austruca lactea (De Haan, 1835) ( Fig. 3C, D )

Ocypode (Gelasimus) lactea De Haan, 1835: 54 , pl. 15(5) (type locality: Japan).

Gelasimus lacteus – Kingsley 1880: 149, pl. 10(28) [part].

Uca lactea – Dawydoff 1952: 141; Jones and Morton 1994: 28, fig. 6, pls. 2G, H, 3E, F; Yamaguchi 1994: 165; Kosuge et al. 1997: 182; Do and Hoang 2002: 128; Do and Hoang 2004: 15; Do and Hoang 2006: 36; S-L Yang et al. 2008: 807; Shih et al. 2009: 376; Shih et al. 2010b: 6, 10; Shih et al. 2013: 643; Le et al. 2018: 41; Do et al. 2021: 102.

Uca (Celuca) lactea lactea – Crane 1975: 298, 300, 612, figs. 19A, 54J–JJ, 69E, pl. 40A, B; Dai et al. 1986: 425, pl. 59(2), fig. 236(1).

Uca (Celuca) lactea – Dai and Yang 1991: 466, pl. 59(2), fig. 236(1).

? Uca lacté – Do 2003: 8.

Uca (Paraleptuca) lactea – Ng et al. 2008: 241.

Uca (Austruca) lactea – Naderloo et al. 2010: 19 , figs. 10a–f, 11a–c, 14a, 15a, 18a, b; Kostina et al. 2016: 210, 211, 257; Shih et al. 2016a: 59, fig. 2A, B.

Austruca lactea – Shih et al. 2015: 182, figs. 146–151; Shih et al. 2016b: 153, 168, fig. 8D; Ng et al. 2017: 123; Sasaki 2019: 12430; Wada 2019: e142.

Austruca (Austruca) lactea – Rosenberg 2019: 734.

Material examined: Hai Phong: 4 òò (9.7–13.3 mm), 5 ññ (9.8–12.3 mm) (NCHUZOOL 15114), Xuan Dam, Cat Ba Island, coll. B. K. K. Chan, 23 Nov. 2011. Nam Dinh: 3 òò (11.8–13.1 mm), 1 ñ (11.2 mm) (NCHUZOOL 15115), coll. V. T. Do, Aug. 2013.

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

Remarks: Austruca lactea has been considered as a continental species ( Shih 2012a), distributed from northern Vietnam, coasts of China, western Taiwan, to Korea and main islands of Japan ( Crane 1975; Shih et al. 2010b 2015). The current southernmost records of this species in South China (the northern coast of Hainan Island) and Vietnam (Huong Phong, Thua Thien Province) are around the latitude of 20°N and 16°N, respectively ( Figs. 1 , 7 ; Shih et al. 2010b; Wada 2019).

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).

Fig. 1. Collection sites for specimens of fiddler crabs from Vietnam examined in this study (see Table 1).

Fig. 7. Oceanographic currents (summer) around Vietnamese waters and the distribution of fiddler crabs. Oceanographic current map is adopted from figure 5D in Xue et al. (2004) (Lincence number: 5380661146310, offered by JOHN WILEY AND SONS LICENSE). Marine ecoregions are indicated by bold dashed lines. Abbreviations: Ocean currents: GTONC – Gulf of Tonkin Current, SCSWC – South China Sea Warm Current, SCSKB – South China Sea Branch of Kuroshio, SEVOC – Southeast Vietnam Offshore Current; marine ecoregions (with numbers as listed in Spalding et al. 2007): GTo – Gulf of Tonkin (112), SC – Southern China (113), SCSOI - South China Sea Oceanic Islands (114), GTh – Gulf of Thailand (115), SV – Southern Vietnam (116), SS – Sunda Shelf (117), SK – South Kuroshio (121). Colorations depicted on marine areas represent sea surface elevation in centimeters. The record of Paraleptuca splendida in Da Nang was reported in Balss (1922) and Austruca lactea in Huong Phong, Thua Thien was recorded by Wada (2019).