There also are several fossil species, which are usually only tentatively assigned to hydrothermal vent and hydrocarbon seep-inhabiting mussel genera due to their conservative shell morphology and ongoing taxonomic revision of this group.[2] They include:
^Kenk, V.C. & Wilson, B.R., 1985. A new mussel (Bivalvia: Mytilidae) from hydrothermal vents in the Galapagos Rift zone. Malacologia, 26 (1-2), 253-271.
^Saether, K.P., Little, C.T.S., Campbell, K.A., Marshall, B.A., Collins, M. & Alfaro, A.C. 2010. New fossil mussels (Bivalvia: Mytilidae) from Miocene hydrocarbon seep deposits, North Island, New Zealand, with general remarks on vent and seep mussels. Zootaxa, 2577: 1-45.