Macromedaeus distinguendus (De Haan, 1835)

Wong, Kingsley J. H., Ng, Peter K. L., Shih, Hsi-Te & Chan, Benny K. K., 2024, Positive association between PTN polymorphisms and schizophrenia in Northeast Chinese Han population., Zoological Studies 63 (38), pp. 141-149 : 88

Macromedaeus distinguendus (De Haan, 1835) # ( Fig. 25E–H )

Chlorodius distinguendus — Stimpson 1858a: 34.

? Xantho distinguendus — Alcock 1898: 113 [part?].

? Chlorodius exaratus var. i, granulosus Stimpson 1907: 56 , pl. 6(3).

? Leptodius exaratus var. granulosus — Gee 1926: 163 [list].

? Leptodius granulosus — Shen 1940a: 225 [no new specimens].

Xanthodius distinguendus — Shen 1940a: 224.

Macromedaeus distinguendus — Blackmore and Rainbow 2000: app. 1; Poon 2000: 12.

Taxonomy: Shen (1932b; as Xantho ), Sakai (1939: as Xantho ), Forest and Guinot (1961: as Xantho ), Guinot (1967c).

Type: Lectotype ò RMNH D 44657 and paralectotypes in RMNH (designated by Yamaguchi and Baba 1993; see also Fransen et al. 1997).

Type locality: Japan, locality unspecified.

Distribution: Probably only in East Asia ( Serène 1984): so far confirmed from coasts of China from Guangdong and Shandong, Korea, and Kyushu, Japan ( Mendoza 2021).

Habitat: Intertidal; under stones or in crevices of rocks ( Dai and Yang 1991).

Remarks: Following indications by S.-k. Lee et al. (2013), records of Chlorodius exaratus var. granulosus described in Stimpson (1907) are tentatively placed under M. distinguendus . The resolution of the actual identities of the various forms recognized by Stimpson (1858b 1907) from East Asia will require more collections and comparisons of characters (see also Remarks under Leptodius affinis and M. adelus above).

Figures

Fig. 25. Macromedaeus adelus Mendoza, 2021 (male, 10.0 × 6.2 mm, Hong Kong; in NHM 1930.12.2.150): A, overall habitus; B, major chela; C, minor chela; D, P4 and P5. Macromedaeus distinguendus (De Haan, 1835) (male, 27.4 × 17.4 mm, Tung Chung): E, overall habitus; F, major chela; G, minor chela; H, P4 and P5.