IRMNG Taxon list
- Rhomboaster bitrifida Romein, 1979 †
- Rhomboaster calcitrapa Gartner, 1971 †
- Rhomboaster cuspis Bramlette & Sullivan, 1961 †
- Rhomboaster intermedia Romein, 1979 †
- Rhomboaster spineus (Shafik & Stradner, 1971) Perch-Nielsen, 1984 †
- Tribrachiatus bramlettei (Brönnimann & Stradner, 1960) Proto Decima et al., 1975 †
- Tribrachiatus contortus (Stradner, 1958) Bukry, 1972 †
- Tribrachiatus orthostylus Shamral, 1963 †
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