Integrative description of a new species of Testechiniscus (Tardigrada, Echiniscoidea) from Novaya Zemlya, Russia, with discussion of the genus diagnosis and distribution

In this paper we describe Testechiniscus sp. nov., a new tardigrade species from Novaya Zemlya, Russia, using data from morphological and morphometric analyses conducted with the use of light and scanning electron microscopy, as well as from genetic analysis based on four molecular markers (three nuclear: 18S rRNA, 28S rRNA, ITS-1, and one mitochondrial: COI). A comprehensive differential diagnosis is provided. Upon examination of both new and the type species we describe internal leg plates as a new character for the genus Testechiniscus, amending the genus diagnosis. This study introduces new data on the geographic distribution of Testechiniscus.