Kajihara, H.; Tamura, K.; Tomioka, S. (2018). Histology-free descriptions for seven species of interstitial ribbon worms in the genus Ototyphlonemertes (Nemertea: Monostilifera) from Vietnam. Species Diversity. 23(1): 13–37.
Histology-free descriptions for seven species of interstitial ribbon worms in the genus <i>Ototyphlonemertes</i> (Nemertea: Monostilifera) from Vietnam
Species Diversity
23(1): 13–37
Publication
Seven (including six new) species of interstitial hoplonemerteans in the genus Ototyphlonemertes Diesing, 1863 are
described from southern Vietnam. The descriptions are based on light microscopic examination of internal structures as
well as three methods of molecular species delimitation analyses, i) Automatic Barcode Gap Discovery (ABGD), ii) Poisson
Tree Process (PTP), and iii) statistical parsimony, on the basis of ~658-bp cytochrome c oxidase subunit I gene sequences
that have been i) newly determined from the Vietnamese specimens and ii) deposited in the public databases for other Ototyphlonemertes
species. Three taxa are circumscribed as ‘species groups’ and placed at an infra-subgeneric, supra-specific
rank, each represented by O. duplex Bürger, 1895, O. macintoshi Bürger, 1895, and O. parmula Corrêa, 1950. Of the seven
Vietnamese species, one is identified as Ototyphlonemertes (species group macintoshi) ani Chernyshev, 2007, which is molecularly
confirmed to be distributed from Vietnam (Phu Quoc and Nha Trang) to Japan (Okinawa and Wakayama). The
other six are new to science, to which formal taxonomic descriptions are given: these are O. (duplex) chernyshevi sp. nov.,
O. (duplex) envalli sp. nov., O. (duplex) norenburgi sp. nov., O. (parmula) lei sp. nov., O. (parmula) nakaoae sp. nov., and O.
(parmula) tsukagoshii sp. nov.
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