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Small to medium-sized
Osstellidae.
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Lateral
field with three incisures.
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Head with
lips almost completely amalgamated , 6 labial and 4 cephalic
papillae
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Amphidial
aperturesa wide slit.
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.Stoma
short, with sclerotized short-cylindrical anterior section and a
membraneous tapering posterior section.
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Esophagus
slender, tripartite, with corpus 40-50% of total length and
cylindrical; isthmus almost as long as corpus but more
slender; posterior bulb offset from isthmus, with or without valve
rudiments.
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Female
reproductive system cephalobid, prodelphic and reflexed, but lacking
double flexure of ovary tip.
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Male
reproductive system monorchic, with the genital papillae elevated on
sockets.
Ref: De Ley and
Coomans, 1990
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