| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Biddulphia alternans (J.W. Bailey) Van Heurck |
Northeast Atlantic | ||
| Biddulphia biddulphiana (J.E. Smith) Boyer |
Northeast Atlantic | ||
| Biddulphia rhombus (Ehrenberg) W. Smith |
Northeast Atlantic |