Setoplectus, Vitiello, 1970

Lu, Yang, Sui, Xinxin & Huang, Yong, 2022, Three new species of free-living marine nematodes from the central basin of the South China Sea, Journal of Natural History 56 (17 - 20), pp. 1091-1107 : 1106

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.