Revision of the Genus Lacunipotamon Dai, Song, He, Cao, Xu & Zhong, 1975 (Crustacea: Decapoda: Brachyura: Potamidae), with Descriptions of Eight New Species from Vietnam

10.6620/ZS.2023.62-20

Peter K. L. Ng；Zhi Wan Tan；Van Tri Ngo

Potamoidea ； New genus record ； Rediagnosis ； Descriptions of new species ； Taxonomy ； China ； Vietnam ； Karst

Zoological Studies

62卷（2023 / 12 / 01）

1 - 58

英文

The taxonomy of the potamid genus Lacunipotamon Dai, Song, He, Cao, Xu & Zhong, 1975, is revised. Three species are known from southern China: L. albusorbitum Dai, Song, He, Cao, Xu & Zhong, 1975 (type species); L. yuanshi Huang, Shih & Ahyong, 2020; and L. cymatile Huang, Shih & Ahyong, 2020. Eight new species are here described from northern Vietnam: L. globus, L. panda, L. contrastum, L. sublividum, L. mimicum, L. thuanchau, L. pectum and L. purpureum. This is the first record of the genus in Vietnam, with all the new species obtained from karst formations. The species are differentiated by the characters of carapace shape, anterolateral armature, posterior margin of the epistome, male sternopleonal cavity, chelipeds, ambulatory legs, male thoracic sternum, male pleon, and structures of the male first gonopods and vulvae.