A new subterranean species of Arisubathynella Park & Eun, 2012 (Crustacea: Bathynellacea: Parabathynellidae) from South Korea, with remarks on the phylogenetic relationships among 15 parabathynellid genera

Abstract

Parabathynellidae, Arisubathynella pocheonensis. sp. nov. from a hyporheic zone of a stream in South Korea. The new species is morphologically distinguished from its congeners by having five teeth on the incisor process in the mandible, and four teeth on the dentate lobe of male thoracopod VIII. The species description is supplemented with molecular information in the form of 18S rRNA and partial CO1 gene sequences. Additionally, the phylogenetic relationships among 15 parabathynellid genera from Europe, America, Australia, India, Thailand, Vietnam, and South Korea are inferred on the basis of 18S rRNA sequences. Members of ArisubathynellaPark & Eun, 2012, AllobathynellaMorimoto & Miura, 1957, and EobathynellaBirstein & Ljovuschkin, 1964 from South Korea belong to two separate geographical clades: Arisubathynella to the European-North American clade and the others to the East Asian clade.