Halidrys siliquosa
- Information on this species, commonly known as Sea Oak, including its description, general biology, taxonomy and reproduction, with a photograph.
- http://www.marlin.ac.uk/species/Halidryssiliquosa.htm

Bifurcaria bifurcata
- Several photographs and information on this species, its habitat, description and key identification features.
- http://www.marlin.ac.uk/species/Bifurcariabifurcata.htm