Ptycholaimellus Cobb, 1920

Huang, Yong & Gao, Qun, 2016, Two new species of Chromadoridae (Chromadorida: Nematoda) from the East China Sea, Zootaxa 4144 (1), pp. 89-100 : 94

Key to the known and the new species of Ptycholaimellus Cobb, 1920

1 Presence of protrusible labial rugae........................................................... P. inaequibulbus

- Absence of protrusible labial rugae........................................................................ 2 2 Presence of ocelli at anterior end of body................................................................... 3 - Absence of ocelli at anterior end of body................................................................... 4 3 Cervical region abruptly narrowing, cephalic setae 1/4 h.d. long....................................... P. ocellatus - Cervical region not abruptly narrowing, cephalic setae 2/3 h.d. long....................................... P. adocius 4 Body stout, width more than 50 µm, with cephalic setae longer than 20 µm....................................... 5 - Body medium, width 42–50µm, with cephalic setae 14–20 µm.......................................... P. setosus - Body slimmer, width less than 40 µm, with cephalic setae <18 µm long........................................... 6 5 Lateral cuticular differentiation begins near head, gubernaculum thin, without lateral processes............... P. carinatus - Lateral cuticular differentiation begins mid-pharynx, gubernaculum with proximal lateral processes and distal small apophyses