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Description of a new species Coomansus batxatensis (Mononchida, Mononchidae) from Vietnam, with an updated key to species

Published online by Cambridge University Press:  14 June 2021

T.T.T. Vu Open the ORCID record for T.T.T. Vu [Opens in a new window]
T.T.T. Vu*
Affiliation:
Vietnam Academy of Science and Technology, Institute of Ecology and Biological Resources, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam Vietnam Academy of Science and Technology, Graduate University of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
*
Author for correspondence: T.T.T. Vu, E-mail: [email protected]
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Abstract

Coomansus batxatensis sp. nov., recorded from Vietnam, is described and illustrated and its phylogenetic relationship within the Mononchida is analysed. The molecular data (18S and 28S ribosomal DNA) are provided for the new species. The new species is characterized by small body size (body length, L = 0.7–0.9 mm); buccal cavity sub-rectangular in shape, flattened at base, 21–24 × 12–13 μm or 1.9 (1.7–2.0) times as long as wide; posterior position of dorsal tooth apex (59–63% from the base of buccal cavity); pars refringens vaginae with faint and small (2.5 × 1.7 μm) teardrop-shaped pieces, short pars distalis vaginae; and males with short spicules (50–51.5 μm) with rounded head and conical blade part. The new species is close to Coomansus parvus but differs from it by the smaller buccal cavity size, more posterior position of the dorsal tooth apex, longer tail and presence of males. An updated identification key to Coomansus species and a compendium of all the species known are presented.

Keywords

Morphology18S rDNA and D2–D3 region of 28S rDNAtaxonomy
Type
Research Paper
Information
Journal of Helminthology , Volume 95 , 2021 , e28
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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