Oxynooidea
Oxynooidea form a superfamily of small and medium-sized nudibranches, with external shell, within the superorder Sacoglossa. There are four families of shelled species: Cylindrobullidae, Volvatellidae, Oxynoidae and Juliidae.
Members of the Juliidae are also known as “bivalved gastropods” because their shells consist of two separate hinged pieces or valves. These valves are joined by a ligament, and do not look like a normal snail shell; instead the valves look almost exactly like the two hinged valves of a clam, also a bivalved mollusk. In the past the Juliidae were known only from fossil shells, but they were classified as a type of mussel, but they are not closely related, it is just a sample of convergent evolution.
The current taxonomy according to Bouchet et al. (2017) and accepted by WoRMS is:
- Superfamily Oxynooidea Stoliczka, 1868 (1847)
- Family Cylindrobullidae Thiele, 1931
- Genus Cylindrobulla P. Fischer, 1857
- Family Juliidae E. A. Smith, 1885
- Subfamily Bertheliniinae Keen & A. G. Smith, 1961
- Genus Berthelinia Crosse, 1875
- Subfamily Juliinae E. A. Smith, 1885
- Family Oxynoidae Stoliczka, 1868 (1847)
- Genus Lobiger Krohn, 1847
- Genus Lophopleurella Zilch, 1956
- Genus Oxynoe Rafinesque, 1814
- Genus Roburnella Ev. Marcus, 1982
- Family Volvatellidae Pilsbry, 1895
- Genus Ascobulla Ev. Marcus, 1972
- Genus Volvatella Pease, 1860
Species of Oxynooidea reported in the Mediterranean or around the Iberian Peninsula:
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Bouchet, P., J. P. Rocroi, B. Hausdorf, A. Kaim, Y. Kano, A. Nützel, P. Parkhaev, M. Schrödl, and E. Strong. 2017. Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61: 1–526.
Bibliography based on the works by Steve Long, 2006. Bibliography of Opisthobranchia 1554-2000 and Gary McDonald, 2009. Bibliographia Nudibranchia, with later updates from other resources.
