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Two new species of freshwater shrimp in the family Atyidae, Caridina tricincta and C. pacbo, are described from the provinces of Tuyen Quang and Ha Giang, and from the province of Cao Bang, respectively, all in northern Vietnam. The new species can be distinguished from congeners by distinct characteristics of the rostrum, first and second pereopods, and male first and second pleopods. Molecular phylogenetic analysis of the mitochondrial cytochrome oxidase subunit I (COI) and 16S ribosomal RNA (16S) genes also support the distinctiveness of the new species from all other examined species. [ABSTRACT FROM AUTHOR]

During recent survey work and examination of museum collections in Hanoi, we became aware that a species misidentified in the literature was in fact a new and rare species of freshwater bivalve. It is currently known only from 12 dry valves in the collections in Hanoi, Vietnam and 2 valves in the North Carolina Museum Collection. These specimens resemble the eastern Chinese genus Pseudobaphia Simpson, 1900. We describe these specimens from the Bằng River, Cao Bằng Province, Vietnam as a new species: Pseudobaphia banggiangensis new species. [ABSTRACT FROM AUTHOR]

Two new terrestrial crab species of the family Potamidae, Tiwaripotamon xuanson and T. hamyen, are described from northern Vietnam. Tiwaripotamon xuanson was collected from Xuan Son National Park, Thanh Son district, Phu Tho province, and T. hamyen was found in Binh Xa commune, Ham Yen district, Tuyen Quang province. They can be distinguished from other congeners by distinct carapace characteristics and gonopod 1 structures. [ABSTRACT FROM AUTHOR]

A new freshwater crab species of the family Potamidae is described from the boundaries of northern Vietnam and southern China. Tiwaripotamon pluviosum sp. nov. can be distinguished from other species by a suite of morphological characters, including a relatively flat carapace, relatively less slender legs, and distinct dorsal flaps on the male first gonopods. Molecular data using the mitochondrial cytochrome oxidase subunit I (COI) also supports this species as being new. [ABSTRACT FROM AUTHOR]

A new species of potamid freshwater crab, Indochinamon chuahuong, is described from Ha Noi, northern Vietnam. The new species can be distinguished from all other Indochinamon species by a suite of characters, including a carapace broader than long; an anterolateral margin that is convex and distinctly serrated; longer ambulatory legs than its congeners; and the terminal segment of the male first gonopod being curved outwards, with a very low dorsal flap. [ABSTRACT FROM AUTHOR]