Histology-free description and phylogenetics of Tetrastemma parallelos sp. nov. (Nemertea: Eumonostilifera) from Japan

ABSTRACT We report a histology-free description of the eumonostiliferous hoplonemertean Tetrastemma parallelos sp. nov. based on a single specimen dredged from a depth between 11 and 18 m off Kouyatsu, Tateyama, Chiba, Japan. Dorsally, T. parallelos sp. nov. is characterised by the presence of two orange-pigmented parallel lines in addition to a reddish cephalic patch. Molecular phylogenetic analyses based on partial sequences of 16S, 18S, 28S rRNA, cytochrome c oxidase subunit I (COI), and histone H3 gene markers along with sequences of 20 Tetrastemma species available in public databases confirmed that our species belongs to a clade recently proposed as the Asian–Australian Pacific subclade of the genus. http://www.zoobank.org/urn:lsid:zoobank.org:pub:7A50603A-9D73-449D-A2E7-343C20AF3A23

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