A new genus in the family Wilsonematidae rank n. (Plectoidea: Nematoda)

The sub-family Wilsonematinae is upgraded to family Wilsonematidae rank n. which can be distinguished from other families of Plectoidea by having cervical expansior:s with elaborate hyperlabial extensions. Wilsonematidae is divided into two sub-families-Wilsonematinae and Tylocephalinae subfamily n., distinguished on the basis of shape of amphid (circular/dorsoventrally oblong respectively). Coronacephalus gen. n. is described and illustrated which is characterized by having well developed double hyperlabial cervical extension of which the inner lining being annulated, flabella non-fimbriate and non-cornuate, and absence of cervical setae. Key to the genera of both the sub-families is provided.