Synonym: Trischistoma Cobb, 1913
Promononchus Micol., 1923
GEN. CHAR. Body tapering at extremities. Caudal
sucker large, well developed. Integument thick, having
well-marked transverse striae, with lateral and ventral pores; setae none
(?); cephalic papillae present or absent. Pharyngeal cavity none.
Oesophagus cylindrical, distinctly muscular; posterior part separated
by a constriction, but not containing any valvular apparatus. Intestine
rather sparsely covered with coarse granules, their arrangement in cells
not being visible. Vulva at about the middle of body. Uterus
segments symmetrical. Spicules of an elongated cuneiform shape.
Accessory piece posterior, very small.
Lateral canals indistinct,
having a faintly granular appearance. No regular ventral duct,
but three large integumental canals in same region, close to anterior
Movements active, often forming into a coil when touched.
(Description- Bastian, 1865)
Definition: Tripylidae. Cuticle with transverse striae
or smooth. Head not offset, composed of 3 large, fairly rounded lips
bearing 3 circlets of short blunt, or longer, bristle-like papillae.
Amphids very inconspicuous. Stoma a simple tube, a tooth present
in dorsal wall. Oesophagus almost cylindrical. Cells of oesphago-intestinal
valve well developed. Vulva almost equatorial; gonads paired, opposed
and reflexed. Testes paired and opposed and emptying into a common
vas deferens. A pair of ejaculatory glands, one on either side, may
also be present. Spicules paired, gubernaculum present. Caudal
glands and terminal duct present. A mid-ventral series of papillae
may also be present in the male.
Type species: Tripyla glomerans Bastian, 1865