Type species: Petalotrypa compressa Ulrich, 1890
This genus includes the species:
| Petalotrypa brevicamerata | Bigey, 1988 | Devonian | France |
| Petalotrypa caucasica | Lavrentjeva, 1997 | Devonian | Russia Transcaucasia |
| Petalotrypa compressa | Ulrich, 1890 | M. Devonian | USA (Iowa) |
| Petalotrypa crassata | Zheng, 1990 | Ordovician | China Nei Mongol |
| Petalotrypa delicata | Ulrich, 1890 | Devonian Givetian | USA Iowa, Illinois |
| Petalotrypa folium | Bassler, 1911 | Ordovician Caradocian ?Silurian |
Estonia Podolia |
| Petalotrypa formosa | Fenton & Fenton, 1924 | Devonian Frasnian | USA Iowa |
| Petalotrypa genuina | Troizkaya, 1968 | Devonian Famennian | Russia? |
| Petalotrypa kazakhstanensis | Troizkaya, 1961 | Devonian Famennian | Kazakhstan |
| Petalotrypa spinifera | Troizkaya, 1975 | Early Carboniferous Tournaisian | Kazakhstan |
| Petalotrypa spjeldnaesi | Annoscia & Grignani, 1969 | Late Devonian | Libya |
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