Type species: Haplotrypa typica Bassler, 1936
This genus includes the species:
| Haplotrypa orientalis | Lu, 1981 | Lower Paleozoic | China |
| Haplotrypa rossica | Astrova, 1965 | Silurian Llandovery | Russia |
| Haplotrypa sibirica | Yaroshinskaya, 1978 | Late Ordovician | Russia |
| Haplotrypa sphaerion | (Hall, 1876) | Silurian Wenlockian | USA Indiana |
| Haplotrypa typica | Bassler, 1936 | Silurian | USA Indiana |
| Haplotrypa typica serotina | Volkova, 1976 | Early Devonian | Russia? |
This information is based upon various sources, but no personal knowledge. I am indebted to the late Alan Horowitz for his compilation, and to Dr. J. Pachut.
I would be grateful for corrections to, or critical reviews of this information. This is not a 'final' version (an impossible ideal), but a working document.
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