Tchesunov A.V.1, Thanh Nguyen Vu2. 2010. A description of Anoplostoma nhatrangensis sp.n. from mangrove habitats of Nha Trang, Central Vietnam, with a review of the genus Anoplostoma Bütschli, 1874 (Nematoda: Enoplida) // Invertebrate Zoology. Vol.7. No.2: 93–105 [in English].
1 Department of Invertebrate Zoology, Faculty of Biology, Moscow State University, Moscow 119991, Russia; E-mail: email@example.com
2 Institute of Ecology and Biological Resources (IEBR), Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Rd., 10000 Hanoi, Vietnam.
KEY WORDS: Anoplostoma, free-living nematodes, mangroves, taxonomy, Vietnam.
ABSTRACT: Anoplostoma nhatrangensis sp.n. is described from a degrading mangrove habitat in the Nha Trang area, Central Vietnam. The new species is characterized by relatively long outer labial setae (81–120% c.b.d.); relatively long tail with longer posterior cylindrical portion (c 5.71–6.92, c’ 8.96–11.8, distal tail part 63–90%); males without preanal bursal papillae and only a minute postanal bursal papilla besides the posterior bursal spine. Anoplostoma nhatrangensis sp.n. is most similar to the A. heterurum differing in certain morphometric values: a bit more stout body (a 33–45 versus 56), and relatively longer tail (c 5.9–6.6 versus 11 and c’ 10–12 versus 6.5) with greater posterior slender cylindrical portion (82–90 versus 75%). A short taxonomic review of the Anoplostoma species is proposed. The genus contains twenty nominal species: fourteen of them are considered as valid; A. brevispiculum is considered as a species incertae sedis because its characters do not fit the generic diagnosis, A. demani as a species inquirenda because of incomplete data of the original description and A. macrospiculum as a junior synonym of A. sunderbanae. Tables of simplified images of male heads and tails as well as list of important morphometric values are proposed as a tool for quicker identification of Anoplostoma species.