Monhysteridae From Western Sudan With Descriptions of Two New Species (Nematoda: Monhysterida)

Abstract

This study deals with five species (two of them new) of the family Monhysteridae belonging to three genera and identified as: Monhystera uncigubernaculum sp. n., M. magnacephala, Eumonhystera sudanensis sp. n., Monhystrella paramacrura and M. hastata. Females of M. uncigubernaculum sp. n. are characterized by the presence of large coelomocytes in the region of the uterus; two to the right side of its posterior part and several on the left side of its anterior part, the presence of two large postvulval gland cells, large uterus and long anteriorly bent vagina. Males are characterized by the presence of large amphidial apertures, long slender spicules and the presence of a unique, long, hook-like, posteriorly directed gubernaculum. E. sudanensis sp. n. is characterized by the presence of perioral platelets, the more posterior position of amphidial apertures with clear amphidial canals and pouches, the presence of refractive ocellus-like bodies, clear outlets of pharyngeal glands and excretory pore and with shorter tail length compared to vulva-anus distance. The genus Monhystera is discussed. Eumonhystera crassa is differentiated from E. dispar. S.E.M. photo's are given for three species.