Xyalidae Chitwood, 1951

Datta, Tridip Kumar, Navarrete, Alberto De Jesus & Mohapatra, Anil, 2015, Rhynchonema dighaensis sp. nov. (Monhysterida: Xyalidae): a marine nematode from the Indian coast with an illustrated guide and modified key for species of Rhynchonema Cobb, 1920, Zootaxa 3905 (3), pp. 365-380 : 367

Family Xyalidae Chitwood, 1951 (after Coomans & Eyualem-Abebe 2006)

Cuticle annulated. Six outer labial sensilla and four cephalic sensilla in one circlet, with cephalic sensilla shorter than or at most equal to labial ones. Often additional cephalic sensilla and occasionally eight groups of subcephalic sensilla present. Stoma usually funnel shaped, completely surrounded by pharyngeal tissue or only at base. Ventral gland mostly absent (or not seen using light microscope). Males with usually two testes, anterior one to the left side of the intestine, posterior one (may be absent) to the right side.Female with one (anterior) ovary on left side of intestine.