Traits Taxon list
- Omphalonema grandiosum Y.-T. Pan, 1978 † (uncertain > unassessed)
- Omphalonema intermedium Y.-T. Pan, 1978 † (uncertain > unassessed)
- Omphalonema magnum Y.-T. Pan, 1978 † (uncertain > unassessed)
- Omphalonema xinjangensis X.-D. Qiao, 1983 † (uncertain > unassessed)
- Oriostoma bromidensis Rohr & R. A. Johns, 1990 †
- Oriostoma sarydalchaensis Gubanov, Blodgett & Lytochkin, 1995 †
- Semitubina sakoi Kase, 1986 †
- Semitubina spinosa (Quenstedt, 1852) †
- Semitubina yukonensis Blodgett, Fryda & Lenz, 2001 †
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