Percnon sinense Chen, 1977

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 : 92-93

Percnon sinense Chen, 1977 # ( Figs. 27 , 39D )

? Percnon affine — Hill et al. 1975: 54; Morton 1976: 97; Hill et al. 1978: 76 [not Acanthopus affine H. Milne Edwards, 1853 ].

? Percnon planissimum — Hill et al. 1978: 114; Hill and Phillipps 1981: 148, pl. 50d [not Cancer planissimum Herbst, 1804 ].

Percnon affinis — Morton 1979a: 112, fig. 6.12; Morton and Morton 1983: 42, fig. 4.4(3), pl. 1A; Morton and Harper 1995: 57, fig. 9(4) [not Acanthopus affine H. Milne Edwards, 1853 ].

Percnon sinense — present record.

Taxonomy: Chen (1977).

Type: Holotype ò and paratypes in IOCAS ( Chen 1977).

Type locality: Sanya, Hainan, China.

Distribution: South China, and southern Taiwan (W-J Chen and Lo 2014).

Habitat: Intertidal and shallow subtidal; crevices, often lodged underside of boulders, along exposed rocky shores.

Remarks: Illustrations of Percnon species provided by Hill and Phillipps (1981: pl. 50d; as P. planissimum ), Morton and Morton (1983, pl. 1A: as P. affinis ) and Morton and Harper (1995: fig. 9(4); as P. affinis ) are nearly identical, and very likely represent the same species. The identification to P. affine (H. Milne Edwards, 1853) is incorrect as their specimens do not have the diagnostic, large basal setal patch on the basal part of the chelae (cf. Crosnier 1965; McLay 1989). Recently we have acquired local material of P. sinense , identified readily by the dorsally spinose P5 coxa ( Fig. 27D ). The coloration of an adult male specimen ( Fig. 39D ) closely matches the above cited local records. As such, we believe these past records also represent P. sinense .

Figures

Fig. 27. Percnon sinense Chen, 1977 (male, 28.1 × 30.2 mm, off High Island): A, carapace and cheliped; B, frontal region and maxilliped 3, ventral view; C, sternum and pleon; D, right P5; E, right G1, ventral view. Structures A, B and D denuded.

Fig. 39. A–D, F, Overall habitus. A, Demania reynaudii (H. Milne Edwards, 1834) (male, 72.6 × 52.5 mm, off Clear Water Bay); B, inset, Leptodius davaoensis Ward, 1941 (male, 19.4 × 12.3 mm, Starfish Bay); C, Atergatopsis germaini A. Milne-Edwards, 1865 (male, 64.4 × 43.8 mm, off Kau Sai Chau). D, Percnon sinense Chen, 1977 (male, 28.1 × 30.2 mm, off High Island); E, F Clistocoeloma nobile B.Y. Lee, N.K. Ng & Ng, 2023 (male, 16.5 × 12.0 mm, To Gwa Peng). F preserved coloration.