Abstract
A new deep-sea species of chaetognaths, Eukrohnia geptneri, from the Northwestern Pacific is described; the young were registered in the epipelagic zone, while the adult specimens were found in deep depths of the Japanese Depression. Morphologically, this species is close to E. bathyantarctic; however, it differs from the latter in a series of characteristics. The diagnosis of the new species, drawings, and identification keys for the world fauna of the genus Eukrohniaare presented. A hypothesis is proposed on the origin of bathypelagic species inhabiting Antarctic waters, the chaetognath Eukrohnia bathyantarcticaDavid, 1958, from the species E. geptnerisp. nov.
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