| Scientific Name | Author | English Name |
|---|---|---|
| Biddulphia petrolia | Hanna | |
| Biddulphia radiata | Roper | |
| Biddulphia regina | W. Smith | |
| Biddulphia reticulum | (Ehrenberg) Boyer | |
| Biddulphia rhombus | (Ehrenberg) W. Smith | |
| Biddulphia spinosa | (J.W. Bailey) Boyer | |
| Biddulphiopsis titiana | (A. Grunow) H. A. von Stosch & R. Simonsen | |
| Biddulphia alternans | (J.W. Bailey) Van Heurck | |
| Biddulphia antediluviana | (Ehrenberg) Van Heurck | |
| Biddulphia biddulphiana | (J.E. Smith) Boyer | |
| Biddulphia obtusa | (Kützing) Ralfs | |
| Isthmia enervis | Ehrenberg | |
| Isthmia nervosa | Kützing | |
| Trigonium arcticum | (Brightwell) Cleve |