Type species: Trematopora alternata Hall, 1883
Placed in the Nikiforovellidae by Blake, 1983
This genus includes the species:
| Acanthoclema alternatum | (Hall, 1883) | L. Devonian (Ems.) | USA (New York) |
| Acanthoclema asperum | (Hall, 1852) | Silurian (Wen., Llan.) | USA, Canada |
| Acanthoclema bispinulatum | (Hall, 1881) | M. Devonian (Giv.) | USA |
| Acanthoclema carbonarium | Coryell in Morgan, 1924 | U. Carboniferous (Mos.) | USA |
| Acanthoclema confluens | (Ulrich, 1888) | L. Carboniferous (Tour. - Vis.) | USA |
| Acanthoclema distilus | Bigey, 1988 | M. Devonian | France |
| Acanthoclema divergens | Hall & Simpson, 1887 | M. Devonian (Eif.) | USA |
| Acanthoclema junggarensis | Xia, 1997 | China | |
| Acanthoclema lineatum | McNair, 1937 | Devonian | USA |
| Acanthoclema ohioense | McNair, 1937 | M. Devonian (Givet.) | USA |
| Acanthoclema ovatum | Hall & Simpson, 1887 | M. Devonian (Eif.) | USA |
| Acanthoclema sulcatum | Hall & Simpson, 1887 | M. Devonian (Givet.) | USA |
| Acanthoclema triseriale | (Hall, 1883) | L. Devonian (Ems.) | USA |
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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