A REVISION OF THE GENUS PSEUDACROBELES STEINER, 1938 (NEMATODA, CEPHALOBIDAE) .2. SUBGENUS BUNOBUS SUBGEN-N, PROBLEMATICAL SPECIES, DISCUSSION AND KEY

Bunobus subgen. n. is proposed under the genus Pseudacrobeles for four species which were found to lack cephalic and labial probolae, and wh ich have subdorsal and subventral lips more developed than the lateral s. Three of these species, P. pulcher, P. loofi and P. pseudolatus, we re previously placed in Heterocephalobus and are now transferred. The fourth is new: P. cruzi sp. n., very close to P. pulcher and P. loofi. The male of P. pulcher is described for the first time. The consequen ces on classification of the revised diagnosis of Pseudarcobeles (give n in Part 1 of this revision) are discussed. Heterocephalobus bastlogo odeyi, H. bisimilis, H. elongatus, H. eurystoma, H. eximius, H. latus, H. loczyi, H. longiaudatus, H. multicinctus and H. nannus are conside red species inquirendae and/or incertae sedis. Heterocephalobus magnif icus is transferred to Heterocephalobellus. Panagrocephalinae becomes a synonym of Cephalobinae with the rejection of Panagrocephalus. Acrol obinae subfam. n. is proposed for the genera Acrolobus, Panagroteratus and Teratolobus, being characterized by six deeply offset, flap-like lips and a cephalobid stoma. S.E.M. pictures of three Bunobus species are given, as well as a key for the redefined genus Pseudacrobeles, wh ich is argued to represent the least derived group within Cephalobinae .