A review of the genus Eriocheir De Haan, 1835 and related genera, with the description of a new genus and a new species (Brachyura, Grapsoidea, Varunidae)

in Crustaceana
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Mitten crabs (Brachyura, Varunidae, Varuninae) are currently classified into six species belonging to three genera: Eriocheir De Haan, 1835, Neoeriocheir T. Sakai, 1983, and Platyeriocheir Ng, Guo & Ng, 1999, i.e., Eriocheir japonica (De Haan, 1835), E. hepuensis Dai, 1991, E. ogasawaraensis Komai, Yamasaki, Kobayashi, Yamamoto & Watanabe, 2006, and E. sinensis H. Milne Edwards, 1853; Neoeriocheir leptognatha (Rathbun, 1913); and Platyeriocheir formosa (Chan, Hung & Yu, 1995). The results of the present study, however, indicate a reclassification into four genera including one new genus, together lodging seven species, including one new species, and with an eighth currently nameless species remaining as a species inquirenda, as follows: Eriocheir De Haan, 1835, with E. japonica (De Haan, 1835) and E. ogasawaraensis Komai et al., 2006; Paraeriocheir gen. nov., with P. hepuensis (Dai, 1991) and P. sinensis (H. Milne Edwards, 1853); Platyeriocheir Ng et al., 1999, with P. formosa (Chan et al., 1995) and P. guangdonga sp. nov.; and Neoeriocheir T. Sakai, 1983, with N. leptognatha (Rathbun, 1913); under the prevailing circumstances, the species now indicated as Eriocheir sp. [= Eriocheir recta sensu Stimpson, 1858] is to be considered a species inquirenda.

A review of the genus Eriocheir De Haan, 1835 and related genera, with the description of a new genus and a new species (Brachyura, Grapsoidea, Varunidae)

in Crustaceana



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  • View in gallery

    Dorsal view of carapace of: A, Eriocheir japonica (De Haan, 1835); B, Eriocheir ogasawaraensis Komai, Yamasaki, Kobayashi, Yamamoto & Watanabe, 2006; C, Paraeriocheir sinensis (H. Milne Edwards, 1853); D, Paraeriocheir hepuensis (Dai, 1991); E, Platyeriocheir formosa (Chan, Hung & Yu, 1995); F, Neoeriocheir leptognatha (Rathbun, 1913).

  • View in gallery

    Male pleopods 1-2 of: A, Eriocheir japonica (De Haan, 1835), right male Plp1, mesial view; B, Plp2 of the same species; C, Eriocheir ogasawaraensis Komai, Yamasaki, Kobayashi, Yamamoto & Watanabe, 2006, right male Plp1, mesial view; D, Plp2 of the same species.

  • View in gallery

    Distal parts of Plp1 of: A, Eriocheir japonica (De Haan, 1835), right male Plp1, mesial view, CBM-ZC 8501, male (CL/CW, 54.6/58.4 mm), Hokkaido, Japan; B, E. japonica, right male Plp1, mesial view, NTOU B00086, male (CL/CW 48.5/52.6 mm), Taipei country, N. Taiwan; C, E. japonica, right male Plp1, lateral view, NSMT-Cr 19941, male (CL/CW, 78.3/87.9 mm), Yokote-city, Akita Pref.; D, E. japonica, right male Plp1, mesial view, RMNH.D.51758, male (CL/CW, 63.6/68.8 mm), Japan, lateral view; E, Eriocheir ogasawaraensis Komai, Yamasaki, Kobayashi, Yamamoto & Watanabe, 2006, right male Plp1, mesial view, paratype, CBM-ZC 8571, male (CL/CW, 65.5/76.2 mm), rocky beach near Yatsuse-gawa river mouth, Chichi-jima I., Ogasawara Is.; F, E. ogasawaraensis, right male Plp1, mesial view, paratype, NSMT-Cr 16818, male (CL/CW, 61.5/71.7 mm), Yatsuse-gawa river, Chichi-jima I., Ogasawara Is.; G, E. ogasawaraensis, right male Plp1, lateral view, paratype, CBM-ZC 8571, male (CL/CW, 65.5/76.2 mm), rocky beach near Yatsuse-gawa river mouth, Chichi-jima I., Ogasawara Is.

  • View in gallery

    Distal parts of Plp1 of: A, Paraeriocheir hepuensis (Dai, 1991), right male Plp1, mesial view, NTOU B00083, male (CL/CW, 47.8/53.9 mm), Hepu, Guangxi, southern China; B, P. hepuensis, right male Plp1, lateral view, NTOU B00083, male (CL/CW, 47.8/53.9 mm), Hepu, Guangxi, southern China; C, Paraeriocheir sinensis (H. Milne Edwards, 1853), right male Plp1, mesial view, NTOU B00084, male (CL/CW, 69.9/74.8 mm), imported; D, P. sinensis, right male Plp1, lateral view, NTOU B00084, male (CL/CW, 69.9/74.8 mm), imported; E, Platyeriocheir formosa (Chan, Hung & Yu, 1995), right male Plp1, mesial view, NTOU B00085, male, (CL/CW 42.0/43.3 mm), E. Taiwan, 26.viii.1992, det. T.-Y. Chan; F, P. formosa, right male Plp1, lateral view, NTOU B00085, male (CL/CW 42.0/43.3 mm), E. Taiwan, 26.viii.1992, det. T.-Y. Chan; G, Neoeriocheir leptognatha (Rathbun, 1913), right male Plp1, mesial view, NTOU B00087, male (CL/CW, 19.6/21.1 mm, frontal margin of carapace cracked), Chang River, China, x.1998; H, N. leptognatha, right male Plp1, lateral view, NTOU B00087, male (CL/CW, 19.6/21.1 mm, frontal margin of carapace cracked), Chang River, China, x.1998, det. T.-Y. Chan.

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