Phylliroidae
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| Menke , 1830 |
The Phylliroidae are a family of medium-sized pelagic species of the sapling snails in the suborder of the nudibranch (Nudibranchia). The three houseless snail species that live in the tropical oceans feed on cnidarians .
features
The Phylliroidae have an elongated, completely transparent body, on which there are no gills after any dorsal processes, but they have two smooth rhinophores , antennae that are used for smelling and flow perception. The anus opens directly behind this on the right side of the back. The foot is greatly reduced. The multi-row, in Cephalopyge only three-row radula can have a rachis tooth with a central cusp. There is a pair of jaws.
Like other hind gill snails , the Phylliroidae are hermaphrodites and have very long vas deferens. The snails mate with each other. The shellless Veliger larvae develop as parasites on jellyfish , which are gradually eaten by the fast-growing young animals.
As adults, the snails swim through wave movements of their whole body. They mainly prey on cnidarians living as plankton .
Systematics
According to Bouchet and Rocroi (2005), the Phylliroidae family is one of nine families in the superfamily Tritonioidea , which in turn alone forms the suborder Dendronotida. The Phylliroidae family includes two genera with a total of three species:
- Phylliroe Péron & Lesueur, 1810 with 2 species: Phylliroe bucephala Lamarck, 1816 and Phylliroe lichtensteinii Eschscholtz, 1825
- Cephalopyge Hanel, 1905, only species: Cephalopyge trematoides (Chun, 1889)
The generic names Bonneviia Pruvot-Fol, 1929, Boopsis Pierantoni, 1923, Ctilopsis André, 1906, Dactylopus Bonnevie, 1921 and Nectophyllirhoe Hoffmann, 1922 are synonyms of Cephalopyge Hanel, 1905. Phyllirhoe is a misspelling of Phylliroe .
literature
- Carol M. Lalli and Ronald W. Gilmer: Pelagic Snails: The Biology of Holoplanktonic Gastropod Mollusks. Stanford University Press, Stanford (California) 1989. 259 S. Phylliroidae : p. 215. ISBN 0-8047-1490-8
- Luise Schmekel, Adolf Portmann: Opisthobranchia of the Mediterranean: Nudibranchia and Saccoglossa . Springer-Verlag, Berlin Heidelberg New York 1982. Phylliroidae Ferussac, 1821 : p. 169.
- Adam Sedgwick, Joseph Jackson Lister, Sir Arthur Everett Shipley: A Student's Text-book of Zoology: Protozoa to Chaetognatha . S. Sonnenschein and Company, 1898. Phylliroidae : p. 412.
- Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN 0076-2997
