| Synonymous name | : | †Achistrum bartensteini (Frizzell & Exline, 1955) | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Achistrum bichordata (Fletcher, 1962) | |
Ref: PBDB: 27 Oct 2013. |
| Synonymous name | : | †Calcligula huckei (Frizzell & Exline, 1955) | |
Ref: PBDB: 27 Oct 2013. |