Bathypelagic Chaetognatha from the Laptev Sea: The new genus Protoheterokrohnia gen. n. (Chaetognatha, Tokiokaispadellidae) and four new species

Abstract

The species list and taxonomic keys for the family Tokiokaispadellidae Salvini-Plaven 1986 are given. A new species, Protoheterokrohnia gen. n., is described (diagnosis): eye with dark pigment; corona ciliata located at eye level, on the neck; a greater part of the posterior fins located on the trunk section; thick rays are present in fins; no gut diverticula; papillae on the ventral part of the head form the right toruli. Drawings, data on the species distribution, and a detailed description of four new species (P. protomirabilis sp. n., P. clavata sp. n., P. bogutskayae sp. n., and P. scipioformes sp. n.) from the Laptev Sea are presented.