Tergipedidae

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Tergipedidae
Tenellia adspersa

Tenellia adspersa

Systematics
Superordinate : Heterobranchia
Order : Hind gill snails (Opisthobranchia)
Subordination : Nudibranchia (Nudibranchia)
Partial order : Thread snails (Aeolidida)
Superfamily : Fionoidea
Family : Tergipedidae
Scientific name
Tergipedidae
Bergh , 1889

The Tergipedidae are a family of small thread slugs in the suborder of the nudibranchs . The exclusively marine shellless snails mainly eat hydrozoa .

features

The Tergipedidae are usually only a few millimeters in size. With the exception of a few species of the genus Tenellia , they have two mouth feelers, but they are shorter than the smooth, up to twice as long rhinophores located above the head . The back is covered with regular rows, often only a few, spindle-shaped or club-shaped cerata , into which, as in other thread snails, extensions of the midgut gland lead, the sections of which correspond to the rows of the cerata. The runners end in so-called nettle sacks, also known as cnido sacks, in which the nettle capsules of the cnidarians that are eaten are stored and serve to defend the snails against predators.

The teeth of the single-row radula have a central cusp, which is usually longer, but sometimes also shorter than the side teeth. The jaws have thin, often serrated edges. The anus opens on the back in the gap between the cerata rows, which are supplied by the right and left lobes of the midgut gland.

Like other thread snails, the Tergipedidae are hermaphrodites . Your penis can be reinforced with a tubular chitin stylet. They have a glandular spermatic duct and an accessory penile gland with an independent mouth, a bursa copulatrix, which receives the sperm of the sex partner, and a fertilization chamber. The snails mate with each other and lay gelatinous egg clutches, in whose transparent shell you can see the numerous eggs. Veliger larvae hatch from these and feed on plankton and after a long pelagic phase they metamorphose into small thread snails .

The Tergipedidae feed on cnidarians, especially hydrozoan polyps .

Some types

Snails of the Tergipedidae family are found in cold, temperate and warm seas around the world. The family is represented in the North Sea by the small thread snail ( Tergipes tergipes ), the lagoon thread snail ( Tenellia adspersa ) and the blue-yellow thread snail ( Cuthona caerulea ).

Systematics

According to Bouchet and Rocroi (2005), the Tergipedidae family is one of five families in the superfamily Fionoidea . These genera belong to the family:

literature

  • Luise Schmekel, Adolf Portmann: Opisthobranchia of the Mediterranean: Nudibranchia and Saccoglossa . Springer-Verlag, Berlin Heidelberg New York 1982. Tergipedidae : p. 243.
  • Philippe Bouchet & Jean-Pierre Rocroi: Part 2. Working classification of the Gastropoda . Malacologia, 47: 239-283, Ann Arbor 2005 ISSN  0076-2997

Web links

Commons : Tergipedidae  - collection of images, videos and audio files

Individual evidence

  1. ^ World Register of Marine Species , Tergipedidae Bergh, 1889
  2. ↑ a b Gosliner, TM 1987. Nudibranchs of Southern Africa ISBN 0-930118-13-8
  3. ↑ http://www.seaslugforum.net/factsheet/pheslugu
  4. ↑ http://www.seaslugforum.net/factsheet/phesmela
  5. ↑ http://www.seaslugforum.net/phesmino.htm
  6. ↑ http://www.seaslugforum.net/showall/phespana