Origin and taxonomic position of Far Eastern island populations of Eurytemora caspica tethysiana subsp. nov.

The article describes a new subspecies Eurytemora caspica tethysiana subsp. nova that, according to its genetic and morphological features, is closely related the recently described species from Caspian Sea. According our hypothesis, both of these taxa are relics fauna Tethys Sea in last phase existence (Paratethys). form occupies an intermediate position between carolleeae by characteristics. time divergence original forms molecular clocks good agreement with geological events associated evolution (8–20 MYA), which indicates very slow rate among representatives Eurytemora. differences nominative are: shapes genital double-somite P5 distal segment females. In males sexually dimorphic left exopod right P5, ratio L abdomen/L caudal rami. At same time, belong affinis group species, includes also affinis. taxon problem species’ discussed present work.