| Contents | Classes | Subclasses | Orders | Families |
Family ORTHODONELLIDAE Jankowski, 1968
Syn. Synhymen[i]idae
Body roughly ovoid, with asymmetrical lobe or beak to the left; one uncertain species very elongate with narrow, pointed tail; single lengthy "membrane," coursing across ventral surface just below oral area and turning anteriad out into the beak along the preoral suture line; predominantly in fresh-water habitats.
[Jankowski's (1967g) Synhymenia was erected for von Gelei's (1939c) Nassula heterovesiculata.]
| Orthodonella Bhatia, 1936 (for Orthodon; syn. Rhabdodon [hom.] ). Few spp. |
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| Synhymenia Jankowski, 1967 (syn. Nassula p.p.). Single species. |
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| Zosterodasys Deroux [unpublished] . Single species. |
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| Incertae sedis: | |
| Eucamptocerca da Cunha, 1914. Single species. |