Some new and known species of genera Tripylina Brzeski and Trischistoma Cobb, 1913 (Nematoda) with a Discussion on their Relationships

摘要

Thepaper deals with description of three new and two known species of Tripylidae O ¨rley, 1880.Two new anda known species of the genus Tripylina Brzeski, 1963 while one new and one known species of Trischistoma are described.Tripylina ymyensis n.sp.is characterised by robust body; long, slender outer labial setae; stoma with thick cuticularised wall bearing a prominent dorsal tooth and twoequal-sizedposteriorly-placedsubventralteeth;largeovoidcoelomocyteswithconspicuous,globularinclusions;simplevaginawithout cuticularisedpiecesandalong,curvedtailwithaU-orS-shapedturn,uniformlytaperingintoanarrowterminus.Tripylinavaliathanin.sp.is characterised by moderately large body; plump, leaf-shaped outer labial setae; stoma with thick cuticularised dorsal wall bearing aprominentdorsaltoothandtwosmallanteriorly-placedsubventraldenticles;largefusiformcoelomocyteswithtaperingendshaving?ne granularinclusions;cuticularisedvagina,adistinctprerectumandastumpy,laterallycurvedtailwithabluntterminus.T.stramenti (Yeates, 1972) Tsalolikhin, 1983 has been reported for the ?rst time from India.Trischistoma minor n.sp.is characterised by medium-sized body; with dense crystalloids and granular aggregates; low, ?attened lip region; plump outer labial setae; slenderer post-labial cephalic setae lying closely posterior to outer labials; a post-uterine sac of one body diameter and a dorsally curved tail with ventral terminal turn.T.pellucidum Cobb, 1913 forms the ?rst report from India.The relationships of Tripylina and Trischistoma have been discussed.