Two new species of nematodes from shallow and deep-water sediments in the South China Sea Author Huang, Mian Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China & University of Chinese Academy of Sciences, Beijing 100039, China Author Shi, Benze Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China & Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China Author Wang, Chunguang Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China Author Xu, Kuidong Laboratory of Marine Organism Taxonomy and Phylogeny, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China & Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China & University of Chinese Academy of Sciences, Beijing 100039, China & Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China text Zootaxa 2021 2021-08-09 5016 4 490 502 journal article 10.11646/zootaxa.5016.4.2 1175-5326 5222467 AB86B403-953C-48E4-9A03-BF9DCE7DAC9A Genus Gomphionema Wieser and Hopper, 1966 Diagnosis: (Modified from Tchesunov (2014)) Cuticle with transversal rows of punctation, lateral differentiation and cuticle pores may be present. Pattern of anterior sensilla 6+6+4, inner and outer labia sensilla papilliform, cephalic sensilla setiform or papilliform. Buccal cavity heavily cuticularized, consisting of an anterior concave chamber and a conico-cylindrical posterior portion, and armed with a massive dorsal tooth not entering the cheilostoma; subventral teeth absent. Amphideal fovea spiral, located near the buccal cavity. Pharyngeal bulb large, “barrel-shaped”. Reproductive system diorchic; both gonads on different sides of the intestine. Males with cup-shaped precloacal supplements; ventral precloacal seta present. Tail conical, usually with rounded tip.