Notaspidea
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Notaspidea, also known as the sidegill slugs, is a suborder which includes both sea slugs and sea snails or limpets, marine opisthobranch gastropod molluscs in the subclass Orthogastropoda.
Their common name derives from the plume-like gill which is emergent from beneath the marginal skirt on the right hand side of the animal.
Adult notaspideans are carnivorous or feeds on dead matter. Their anatomy is characterized by a single, external ctenidium (respiratory apparatus) on the right side, rolled rhinophores, and a flattened shell. The families Tylodinidae and Umbraculidae show large limpet-like external shells and a small mantle, while the species in the family Pleurobranchidae have a prominent mantle and an internal shell that becomes reduced or is lost in adults [1]. Many species produce mantle secretions as a chemical defense against predators [2]
[edit] Families
- Pleurobranchidae Menke, 1828
- Tylodinidae Gray, 1847
- Umbraculidae Dall, 1889
However, in the new taxonomy of Bouchet & Rocroi (2005), the families Umbraculidae and Tylodinidae belong to the superfamily Umbraculoidea Dall, 1889 , part of the clade Umbraculida. Grande et al. (2004) found Umbraculoidea sister clade to Cephalaspidea (Acteonoidea excluded).[3]
[edit] Notes
- ^ R. Willan (1987). "Phylogenetic systematics of the Notaspidea (Opisthobranchia) with a reappraisal of families and genera". AM; Malacol. Bull. 5: 215–241.
- ^ Aldo Spinella, Ernesto Mollo, Enrico Trivellone and Guido Cimino (December 1997). "Testudinariol A and B, two unusual triterpenoids from the skin and the mucus of the marine mollusc Pleurobrancus testudinarius". Tetrahedron 53 (49): 16891–16896. doi:.
- ^ Grande C., J. Templado, J.L. Cervera, R. Zardoya (2004). "Phylogenetic relationships among Opisthobranchia (Mollusca, Gastropoda) based on mitochondrial cox1, tmV, and rmL genes". Molecular Phylogenetics and Evolution 33: 378–388. doi:.
[edit] References
- Notaspidea (TSN 78119). Integrated Taxonomic Information System.
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
