Two new species of the genus Parasphaerolaimus Ditlevsen, 1918 (Nematoda, Monhysterida) from water bodies of Northern Vietnam
DOI:
https://doi.org/10.33910/2686-9519-2019-11-4-267-278Keywords:
Vietnam, free-living marine nematodes, new species, Parasphaerolaimus tropicus sp. nov., Parasphaerolaimus minor sp. nov.Abstract
Two new nematode species of the genus Parasphaerolaimus Ditlevsen, 1918 were found in an artificial reservoir for shrimp cultivation and in the waters along the coastline of the South China Sea in Vietnam. P. tropicus sp. nov. is morphologically close to P. brevisetosus Gagarin, 2014, P. lodosus (Gerlach, 1956) and P. crassus (Timm, 1961). From the first species it differs in having a shorter body, longer cephalic setae, the presence of numerous and long cervical setae and absence of precloacal supplements in males. From the second species it differs in having a shorter body, a less slender tail, the presence of numerous and long cervical setae and a different arrangement of amphidial fovea. From P. crassus it differs by having a shorter cervical setae, longer spicules, larger amphidial fovea and a relatively shorter tail. P. minor sp. nov. is morphologically close to P. pilosus Zograf et al., 2017, but has a smooth cuticle, a shorter body, and shorter spicules and no cervical setae. The authors provide the dichotomy key for the identification of the valid species of the genus Parashaerolaimus.
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