Uca (Austruca) lactea (De Haan, 1835)

Naderloo, Reza, Türkay, Michael & Chen, Hui-Lian, 2010, Taxonomic revision of the wide-front fiddler crabs of the Uca lactea group (Crustacea: Decapoda: Brachyura: Ocypodidae) in the Indo-West Pacific, Zootaxa 2500, pp. 1-38 : 19-21

Uca (Austruca) lactea (De Haan, 1835)

( Figs. 10 a –f, 11 a –c, 14 a, 15 a, 18 a, b)

Ocypode (Gelasimus) lactea De Haan 1835: 54 , P 1. 15, fig. 5.

Gelasimus lacteus — H. Milne Edwards 1852: 150, pl. 4, fig. 16. — Stimpson 1858: 100. — Miers 1879: 20, 36. — Kingsley 1880: 149, pl. 10, fig. 28. — Cano 1889: 234. — De Man 1891: 22. — Ortmann 1894 a: 752, 759. — Alcock 1900: 352 (in key), 355. — Lin 1949: 26.

Uca lactea — Ortmann 1897: 351 –355. — Balss 1922: 143. — Schenkel 1902: 580. — Gee 1925: 165. — Kellogg 1928: 356 (in list). — Gordon 1931: 528. — T. Sakai 1934: 320; 1936: 171; 1939: 618. — Kamita 1935: 241 (in list). — Miyake 1936: 511; 1939: 222, 242. — Ono 1965: 8. — Yamaguchi 1970: 5; 1973: 154; 1977: 426; 1978: 29; 2001 a: 285; 2001 b: 389. — Murai et al. 1987: 1334. — Jones & Morton 1994: 11 (in key), 28–30, fig. 6 A –I, Pl. 2 G, H, Pl. 3 E, F. — Iguchi et al. 1997: 70, fig. 2. — Yamaguchi & Ogata 2000: 133. — Ng et al. 2001: 37 (in list). — Tanaka et al. 2004: 8. — Kwok & Tang 2006: 4, figs. 10, 11. — Shih et al. 2009: 377.

Austruca lactea — Bott 1973: 322, fig. 14.

Uca (Celuca) lactea lactea — Crane 1975: 300, figs. 19 A, 54 J, 69 E, Pl. 40 A –B. — T. Sakai 1976: 608, P 1. 209, fig. 1. [part.]. — Miyake 1983: 162, pl. 55, fig. 2.

Uca lactea lactea — Yamaguchi 1983: 25. — Kim & Kim 1995. — Shih et al. 1999: 170.

Ucca (Celuca) lactea — Dai & Yang 1991: 466, fig. 236 (1), pl. 49 (2).

Paralectotypes. 3 males, 1 female ( ZMG 105), Japan, 1 eg. P. von Siebold. [exchanged with Leiden Museum in 1880]; 1 male ( MNHN B 11967 ); 1 male ( MNHN B 11964 ), [exchanged with Leiden Museum].

Other material. Korea: 2 males, 1 female ( MNHN B 7912), Yellow Sea, Kanghwa-do, W of Seoul, 0 3.10. 1967, leg. H. S. Kim.

Japan: 3 males (UZM); 5 males ( ZMH K 3165), Shikoku, Sanuki, 13.03. 1897, ded. Leum; 1 male ( ZSM), Okayama-ken, Okayama, freshwater, 1904 /05 1 eg. H. Sauter [Coll. Doflein]; 48 males, 2 females ( ZMH K 2989), Kagoshima-ken, Satsuma Hanto, Tani Yama Wada, 29.12. 1898, vend. Faber & Voigt; 1 male ( SMF 34991 ), Yoshinogawa River, 13.08. 1992, Hayashi & Hirata; 1 male ( SMF 8183), Yoshinogawa River, 13.08. 1992, Hayashi & Hirata; 1 female ( SMF 34968 ), Tokushima city, Sumiyoshi, Yoshinogawa River, 30.07. 1992, Hayashi & Hirata, ded. K. Sakai; 1 female ( SMF 34969 ), Tokushima City, Sumiyoshi, Yoshinogawa River, 30.07. 1992, Hayashi & Hirata, ded. K. Sakai; 1 male ( SMF 34999 ), Tokushima City, Sumiyoshi, Yoshinogawa River, 0 6.09. 1992, ded. K. Sakai; 5 males, 1 female ( SMF 35003 ), Tokushima, Jotocho, mouth of the Yoshinogawa River, 0 9.08. 1983, K. Sakai; 1 male ( SMF 35005 ), Tokushima, Ohjincho, Yoshinogawa River, 26.04. 1983, K. Sakai; 2 males ( SMF 35006 ), Tokushima, Ohjincho, Yoshinogawa River, 0 5.07. 1981, K. Sakai; 2 males ( SMF 35007 ), Kochi, Tosa Bay, Utsuga, 24.07. 198026.07. 1980, K. Sakai; 5 males, 2 females ( SMF 35008 ), Hiroshima, Urazaki-cho, Onomichi, 02.09.1981 - 05.09.1981, Y. Kuwada, ded.

K Sakai; 1 male, 1 female ( SMF 35009 ), Kochi, Shimantogawa River, 0 1.08. 1996, K. Sakai; 5 males, 2 females ( SMF 35010 ), Amakusa Island, Kyushu, 04.1974–05.1981, Y. Ono, ded. K Sakai; 1 male, 1 female ( SMF 35011 ), Kochi, Irino, Okata-cho 0 1.08. 1996, K. Sakai.

Taiwan: 1 male ( SMF 8813) W. coast, Mai Liao, 23 º 47 'N, 120 º 11 'E, sandy-mud flat, 0 2.08. 1977, leg. J. Dörjes; 1 male, 2 females (juv.) ( SMF 8814), 0 7.09. 1977, leg. J. Dörjes; 1 male (UZM), Tanshui River NW. of Taipei [ex Mus.Milano, 20.02.1922]; 2 Chelas ( ZSM), Amping, 1 eg. Haberer; 1 male ( ZSM), Takao, 0 6.1903, 1 eg. Haberer.

China: 26 males, 5 females ( ZMH K 6755); 2 males ( MNHN B 11963 ); 2 males ( ZSM); 3 males ( MNHN B 11966 ), leg. M. Callery; 10 males, 3 females ( ZMH Ex K 3100), 04.09.1919; 13 males, 3 females ( ZMH ex K 3156), 28.10. 1910, leg. G. Siemssen; 1 male ( IOASQ), Shajiang, 0 3.03 .1957, 1eg. Fan & Xu; 4 males, 1 female ( ZMH Ex K 3154), Fuzhou, 13.06. 1903, leg. G. Siemssen; 2 males ( IOASQ), Quanzhou, Shengpu, 21.06 .1975, 1eg. H.L. Chen; 2 males, 2 females ( IOASQ), Tongan, Xiaodeng, N. of Xiamen, 0 2.04 .1982, 1eg. H.L. Chen; 5 males, 1 female ( MNHN B 11965 ), Xiamen, 0 7.1925, 1 eg. C.F. Wang; 2 males, 2 females ( SMF 17158 ), Xiamen, Zhongzhai, 26.05. 1982, leg. H.L. Chen; 1 male, 1 female ( SMF 17159 ), Dongshan, Beinanao, 26.05 .1975, 1eg. H.L. Chen; 1 male ( IOASQ); 2 males, 1 female ( SMF 17160 ), Hainan, Haikou, Cangtonqian, 0 7.06. 1958, leg. J.Y. Liu; 1 male, 1 female ( IOASQ); 2 males ( SMF 17162 ), Haikou, Beigang, 0 6.06. 1958, leg. J.Y. Liu; 1 male ( SMF 17161 ), Beili, 12.07 .1957, 1eg. J.Y. Liu.

Diagnosis. Front broad. Anterolateral borders moderately convergent. palm of major male chela without supramarginal groove adjacent to lower border. G 1 ( Fig. 10 f) with palp long, reaching up to distal half of horny endpiece; this last one has inclined flanges, but no strong torsion ( Fig. 11 c); terminal opening at base of deep emargination of distal margin ( Fig. 11 b). Genital opening of female ( Fig. 11 a) and thus also direction of the opercle's edge slightly oblique in respect to median line of sternum.

Distribution. Korea, Japan, Taiwan, China, northern Vietnam. The northern limit in China is in Zhejiang Province, Ise Bay in Japan. Southwards the species reaches Hainan Island, China and northern Vietnam.

Remarks. The species is easily recognisable by the peculiar shape of the G 1, especially the large size of the palp. U. lactea may easily be distinguished from U. perplexa , with which it may be sympatric at least in the Ryukyu Islands, by the lack of a supramarginal groove on the major chela palm as well as by the weakness of the subdistal tooth on the fixed finger of the same limb ( Figs. 10 b –e), which is more prominent in U. perplexa and makes it easily distinguishable from its congener.

The southern distribution of this species is not well known. This applies especially to the Ryukyus, from which it was reported by T. Sakai (1976). Although Sakai mentioned the presence of U. lactea in the Ryukyus, but he did not list U. perplexa from Japan. Sakai probably ignored Crane's record of U. perplexa in the Ryukyus. Crane (1975), however, only recorded U. perplexa from this area and our material also belongs to this species. On the contrary, we have not seen any specimen of U. perplexa from China. The same applies to our few specimens from Taiwan, which all belongs to U. lactea , although the species has been recorded from Taiwan several times (see Ng et al. 2001). It has to be checked if U. perplexa and U. lactea exclude each other or if they are sympatric in part of their range. The factors limiting the distribution of the two species also remain unknown. The median tooth of the gastric mill of U. lactea ( Fig. 14 a) is unique among all member of the U. lactea- group, but slightly similar to U. perplexa rather than others. But regarding the form of the lateral tooth plate of the gastric mill ( Fig. 15 a) and the number of teeth on it, numbering 22 and being comb-shaped, ally the species with U. annulipes and U. albimana .

Figures

FIGURE 10. Uca lactea (De Haan, 1835): a, b, c, f, paralectotype male (ZMG 105), Japan; d, e, male (SMF 1813), Taiwan: a, infraorbital region; b, major chela, inner surface; c, major chela, outer surface; d, major chela, inner surface; e, major chela, outer surface; f, G 1, lateral surface.

FIGURE 11. Uca lactea (De Haan, 1835): a, female (SMF 17159) Taiwan; b, c, paralectotype male (ZMG 105), Japan; a, genital opening; b, apical part of G 1, lateral surface; c, apical part of G 1, mesial surface.

FIGURE 14. Median tooth of the gastric mill, ventral face. a, Uca lactea (De Haan, 1835), male (SMF 17161); b, Uca mjoebergi Rathbun, 1924, male (SMF 17163).

FIGURE 15. Lateral tooth of the gastric mill, mesial face. a, Uca lactea (De Haan, 1835), male (SMF 17161); b, Uca mjoebergi Rathbun, 1924, male (SMF 17163).