Three new genera and new species of hystrignathid nematodes (Nematoda: Thelastomatoidea) from passalid beetles (Insecta: Passalidae) from Yunnan Province, China with phylogenetic analysis of Hystrignathidae Author Zhang, Ningning Author Yin, Shi Author Carreno, Ramon A. Author Zhang, Luping text Zootaxa 2021 2021-11-23 5071 2 206 222 journal article 3292 10.11646/zootaxa.5071.2.2 15c88b50-3c7a-48c4-981d-6d9239529e04 1175-5326 5723542 2D907411-3227-409E-B644-2FB86937D2FF Parakongonema gen. n. Diagnosis : Female body robust. Cervical cuticle unarmed, strongly annulated. Lateral alae present. Head well developed, bearing eight rounded papillae. Amphids pore-like, laterally situated. Oral opening triangular, surrounded by cuticular ring. Ring surrounded by cuticular flap. First cephalic annule slightly inflated, about two head-lengths long. Oesophagus consisting of a muscular, sub-cylindrical procorpus, very short isthmus, and spherical basal bulb with valve plate well developed. Intestine simple, sub-rectilinear, anterior portion slightly dilated. Vulva located near mid-body, with lips slightly salient. Vagina muscular, anteriorly directed. Didelphicamphidelphic. Eggs ovoid, ornamented with rough longitudinal ridges on shell. Tail short, sharply attenuate, and filiform. Male unknown. Type species : Parakongonema sinica gen. n. et sp. n. Distribution : China . Etymology : The genus name refers to the close resemblance between this genus and Kongonema .