Two new species of free-living nematodes from the East China Sea
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Two new species of free-living nematodes from the East China Sea SUN Yan1, HUANG Mian1, HUANG Yong1* 1 College of Life Sciences, Liaocheng University, Liaocheng 252059, China
Received 5 July 2017; accepted 22 December 2017 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2018
Abstract
Two new species of free-living marine nematodes of the genera Hopperia and Nemanema are described from the sublittoral sediment of the East China Sea. Hopperia macramphida sp. nov. is characterized by having large amphidial fovea with five turns; arcuate spicules with enlarged proximal end and central internal lamella extending one third of spicule length from proximal end; gubernaculum with bent apophyses, six papilliform precloacal supplements; and conico-cylindrical tail with swollen tip and terminal setae. Nemanema minutum sp. nov. is characterized by relatively smaller body size in the genus; large oval amphidial fovea; conical tail; slender spicules with alae and hooked proximal end; ring-like gubernaculum; and papilliform precloacal supplements with three short setae. An updated dichotomous key is provided for the 17 species of Hopperia. Key words: Hopperia macramphida sp. nov., Nemanema minium sp. nov., marine nematode, taxonomy Citation: Sun Yan, Huang Mian, Huang Yong. 2018. Two new species of free-living nematodes from the East China Sea. Acta Oceanologica Sinica, 37(10): 148–151, doi: 10.1007/s13131-018-1317-y
1 Introduction The genus Hopperia was set up by Vitiello (1969) based on the type species of Hopperia massiliensis Vitiello, 1969. To date, the genus contains 16 species recorded worldwide (Leduc, 2012; Guo et al., 2015; Campinas Bezerra et al., 2017). Hopperia species have characters of cuticle with lateral differentiation of irregularly arranged larger dots but not longitudinal rows; posterior portion of buccal cavity cylindrical, with three thorn-like teeth at border to anterior portion; spicules short; gubernaculum with caudal or dorso-caudal apophyses (Jensen, 1979; Platt and Warwick, 1988). The genus Nemanema was described by Cobb (1920) with the type species of Nemanema simplex Cobb, 1920. Currently, 11 species have been recoeded from all around the world. The characteristic feature of Nemanema is the strongly attenuated anterior end; no buccal cavity; oval-shaped amphidial fovea; six outer labial setae and four cephalic setae; prominent oval cells scattered throughout the body cavity; tail conical to rounded. It is similar to genus Oxystomina excepting the rounded tail (Platt and Warwick, 1983). In order to study the biodiversity of free-living nematodes in the East China Sea, sediment samples were collected in many sites from the intertidal to the sublittoral region in the past few years. More than 300 species have been found from these habitats (Jiang et al., 2016). Of these, two species are new to science and are described as Hopperia macramphida sp. nov. and Nemanema minutum sp. nov., respectively.
33 sampling stations between 25°21′N to 30°00′N, 120°50′E to
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