Parapyxidognathus ongia Hsu & Shih, 2024

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 : 107

Parapyxidognathus ongia Hsu & Shih, 2024 # ( Figs. 31 , 40B )

Parapyxidognathus ongia — present record.

Taxonomy: Hsu and Shih (2024).

Type: Holotype ò NCHUZOOL-17208 and paratype ñ in NCHUZOOL.

Type locality: Toucheng, Yilan, Taiwan.

Distribution: West Pacific and East Asia: southern China (Hainan and Hong Kong), Taiwan, the Philippines and New Caledonia.

Habitat: Supratidal to freshwater; among rock fragments submerged in freshwater streams near the shore.

Remarks: This species is a new record for the fauna of Hong Kong.

Varuna litterata (Fabricius, 1798) #

? Varuna litterata — Stimpson 1858b: 103; Heller 1865: 51; Doflein 1902: 664; Stimpson 1907: 124; Gee 1926: 165 [list]; Shen 1940a: 238; TH Lui et al. 2002: app. 2.

Varuna litterata — Wong et al. 2021: 65, fig. 102a–c, pl. 19D.

Taxonomy: Hwang and Takeda (1986), Ng (1998), Cai and Ng (2001).

Type: Lectotype ñ UZMC 120-1, and paralectotypes in NHMD (designated by Ng 1988b; see also Zimsen 1964).

Type locality: “in India orientali”, probably Tharangambadi (= Tranquebar), India.

Distribution: Western Indian Ocean to West Pacific: from South Africa, Madagascar, to India, Christmas Island, Indonesia, East Asia to Japan, and eastern Australia ( Cai and Ng 2001).

Habitat: Intertidal to freshwater; migratory species between shallow seas, intertidal habitats and freshwater streams.

Remarks: See Remarks under V. yui below.

Varuna yui Hwang & Takeda, 1986 #

? Varuna litterata — Morton and Morton 1983: 227, fig. 11.11(2); SY Lee 1993: tab. 1; So and Lui 2007: 37, 4 unnumb. figs.

Varuna yui — Davie 1992a: 350; SY Lee and Leung 1999: 70, pl. 13; Wong et al. 2021: 65, fig. 102d–h, pl. 19E; Bravo et al. 2021: tab. 2.

Taxonomy: Hwang and Takeda (1986), Ng (1998), Cai and Ng (2001).

Type: Holotype ò in NSMT, and paratypes in NSMT, NTM, BNHM, PNM, AM, AHF (now in LACM), USNM, NHM, MNHN, RMNH, SMF ( Hwang and Takeda 1986).

Type locality: Datong (as Da-Taung) Village, Yilan, Taiwan.

Distribution: Southeast and East Asia: Indonesia, Singapore, Peninsular Malaysia, Thailand, Vietnam, South China and Taiwan.

Habitat: Supratidal to freshwater; shore swamps of much freshwater influences, to freshwater streams.

Remarks: Varuna H. Milne Edwards, 1830 was long regarded as monotypic until the description of V. yui Hwang & Takeda, 1986 , and Davie (1992a) was correct in pointing out that many past records of V. litterata should instead be referred to V. yui . We have examined local material of both species, and V. yui remains the far more common taxon ( Wong et al. 2021).

Figures

Fig. 31. Parapyxidognathus ongia Hsu & Shih, 2024 (male, 16.6 × 12.9 mm, Tai Tam): A, carapace; B, maxilliped 3; C, right chela, external view; D, right chela, internal view; E, right P5.

Fig. 40. A, B, C, E, overall habitus; D, F, ventral view. A, Nanosesarma pontianacense (De Man, 1895) (male, 5.3 × 6.4 mm, Tung Chung); B, Parapyxidognathus ongia Hsu & Shih, 2024 (male, 16.6 × 12.9 mm, Tai Tam); C, D, inset, Hemigrapsus penicillatus (De Haan, 1835) (male, 16.3 × 14.6 mm, Lung Mei); E, F, inset, Hemigrapsus takanoi Asakura & Watanabe, 2005 (male, 19.1 × 16.7 mm, Tung Chung). A and B preserved coloration.