Girvanella
Note that Girvanella belongs to the cyanobacteria, but is listed here under algae out of convenience
Species
Girvanella wetheredii
Occurrence: Upper Member of Whitewater
Reference: Blackwell et al., 1984
Girvanella labyrinthica (Ulrich)
Occurrence: ?
Reference: Blackwell et al., 1984
Originally Streptospongia labyrinthica
Blackwell et al., 1984 question whether this is truly a Girvanella