Flabellina
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| Gray , 1833 |
Flabellina is a species-rich genus of thread snails in the family Flabellinidae . The mostly small to medium-sized, marine , shell -less snails mainly eat hydrozoa .
features
The thread snails of the genus Flabellina have lamellar rhinophores . The corners of the foot are elongated in the form of antennae. The back is covered with cerata arranged in groups on pedestals , in which the nettle capsules of the eaten cnidarians are stored.
The side teeth of the three-row radula are toothed, the rachis tooth is set with side teeth. There are four or more rows of teeth at the edge of the jaw. The anus opens on the right side of the body next to the rows of cerata.
The Flabellina snails, which are hermaphroditic like other thread snails, have one or two receptacula seminis . They have an unreinforced penis and a pronounced ejaculatory duct.
The snails eat cnidarians, especially hydrozoan polyps , but also sea anemones . Preferred prey animals of many species are hydrozoans of the genus Eudendrium .
Some types
Thread snails of the genus Flabellina are usually no longer than four centimeters. The Spanish scarf ( Flabellina iodinea ) from the North American Pacific coast is one of the largest species, measuring up to 7 cm . In the North Sea the family is represented by the red-violet thread snail ( Flabellina pedata , formerly Coryphella pedata ), the milky thread snail ( Flabellina pellucida ), the red-backed thread snail ( Flabellina verrucosa ), the salmon thread snail ( Flabellina salmonacea ) and Flabellina browni .
Systematics
Flabellina is one of seven genera in the Flabellinidae family. The genus currently includes 61 species.
The generic names Coryphella Gray, 1850 (which referred to a group of very small thread snails), Coryphellina O'Donoghue, 1929, Himatella Bergh, 1890 and Himatina Thiele, 1931, are synonyms of the older generic name Flabellina Gray, 1833.
Mention in the film
In the science fiction film 20,000 Leagues Under the Sea by Walt Disney, the harpooner Ned Land accidentally swallows a specimen of the fictional species "Flabellina oculina". In fact, an Oculina is a genus of the Oculinidae from the hard coral family.
literature
- Luise Schmekel, Adolf Portmann: Opisthobranchia of the Mediterranean: Nudibranchia and Saccoglossa . Springer-Verlag, Berlin Heidelberg New York 1982. Flabellina Voigt, 1834 : p. 184.
- Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN 0076-2997
Web links
Individual evidence
- ^ World Register of Marine Species , Flabellina Gray, 1833
- ↑ Flabellina oculina | monsterminions. Retrieved January 21, 2017 .