Three new species of free-living marine nematodes from the central basin of the South China Sea Author Lu, Yang Author Sui, Xinxin Author Huang, Yong text Journal of Natural History 2022 2022-08-18 56 17 - 20 1091 1107 http://dx.doi.org/10.1080/00222933.2022.2102446 journal article 125515 10.1080/00222933.2022.2102446 302869ed-d182-42e1-ba1e-96a945025a96 1464-5262 7012374 623BC44A-A07F-420E-AA41-271CF85F64C6 Updated key to species of the genus Setoplectus (based on; Andrássy 1973 ) 1 Body slender (a = 70–90), longer than 1.3 mm ....................................................................... 2 - Body plumper (a = 20–35), shorter than 1 mm ....................................................................... 3 2 Head spherical, body 1.4 mm long, tail elongate conical, 4 abd long, male with 14 precloacal supplements .................................................................... S. riemanni Andrássy, 1973 - Head conical (narrow), body 2.1–2.4 mm long, tail shorter than 2 abd, male with one precloacal supplement ...................................................... S. proceroviscerali Andrássy, 1973 3 Cephalic sensilla longer than 1 hd, situated farther than 1 hd from the anterior end .. ................................................................ S. amphibulbosus (Gerlach, 1955) Vitiello, 1970 -1971 - Cephalic sensilla shorter than 1 hd, situated close to the anterior end ....................... 4 4 Body longer than 0.7 mm , tail conico-cylindrical, 2–3 abd long, male with 4–5 precloacal supplements ............................................................... S. gerlachi Vitiello, 1970 -1971 - Body shorter than 0.5 mm , tail conical, longer than 4 abd, male with one precloacal supplement. ................................................................................................................. S. minor sp. nov.