Cribronema Siddiqi, 1993

Boström, Sven & Holovachov, Oleksandr, 2019, Description of Cribronema sturhani sp. n. (Nematoda, Rhabditida, Cephalobidae) a second species of a rare genus from Cameroon, Zootaxa 4695 (2), pp. 175-181 : 175

Genus Cribronema Siddiqi, 1993

Type species. Cribronema cribrum Siddiqi, 1993

Valid species. C. sturhani sp. n.

Diagnosis (emended after Holovachov et al., 2009). Cuticle annulated, without distinctly annulated internal layer; annuli smooth. Lateral field with two wings (three incisures); ending at level of phasmids or just posterior to it in females and at base of terminal tail mucro in males. Lip region weakly offset, crown-shaped, consisting of six leaf-like lips equal in size. Pairs of lips separated by primary axils and secondary axils without guard processes, U-shaped clefts of axils internally sclerotized. Cephalic probolae trilobed, with median rectangular lobe and lateral triangular lobes. Labial probolae absent. Six outer labial and four cephalic papilliform sensilla arranged in a cephaloboid manner. Amphidial aperture rounded, located on lateral lips. Stoma divided into cheilo-, gymno- and stegostom: cheilostom barrel-shaped with strongly sclerotized bacilliform cheilorhabdia; gymnostom barrel-shaped, as wide as stegostom, with strongly sclerotized plate-like gymnorhabdia; stegostom consists of a funnel-shaped prostegostom and variably shaped mesostego-, metastego- and telostegostom parts. Metastomatal denticle absent. Pharynx cephaloboid: pharyngeal procorpus and metacorpus slightly fusiform, lining of procorpus and metacorpus are of same thickness; isthmus narrower than metacorpus; basal pharyngeal bulb oval, with strongly developed valves. Nerve ring encircling posterior part of metacorpus. Excretory pore opens at level of nerve ring, at around the level of metacorpus or metacorpus-isthmus junction. Deirids present. Female reproductive system cephaloboid; posterior part of ovary straight; spermatheca present or reduced; postvulval uterine sac present; vulva protruding, flat or in a depression; vagina straight. Male reproductive system cephaloboid; spicules cephaloboid with manubrium and corpus of approximately equal width; gubernaculum plate-like; cornua crurum absent. Male genital papillae: one or two ventrosublateral pairs located anterior to cloaca; one ventrosublateral pair located at the level of cloacal opening; two pairs located at middle of tail length; and three pairs (lateral, subventral and subdorsal) near tail terminus; there is a midventral papilla on anterior cloacal lip. Rectum short (1.1-1.8 times longer than anal body diameter). Phasmids located at level of anterior part of the tail in females, at around mid-tail in males. Female tail conoid, straight, tail terminus with pointed or harpoon-shaped mucro; male tail conoid, arcuate ventrad, tail terminus with pointed mucro.