Goniodorididae

Ancula gibbosa, Ernst Haeckel (1904 ): Art Forms of Nature, Table 43: Nudibranchia

The folds snails or stylus snails ( Goniodorididae ) are a family of slugs in the subordination of the nudibranchs. These are mostly small, exclusively marine shell-less snails, which feed depending on the nature of various sessile animals.

Features

The Goniodorididae have a narrow, often with simple extensions ( " pencils " ) provided back hem at the top and the sides, which is almost entirely lacking in some way, where instead extensions are available. Both seated on the head sensor, the rhinophores are laminated, particularly in the genus Okenia but only at the rear. The around the anus at the back arranged gills can not be withdrawn.

The snails have a very narrow radula with large hook-shaped inner side of teeth and plate-shaped edge teeth. Jaw missing. At the pharynx located posterior to a goiter, by means of which food can be absorbed.

While snails of the genus Trapania feed on Kamptozoen, eat members of the genus Goniodoris sea squirts, and in the genus Okenia are the prey bryozoans, both soft and hard Ctenostomata, calcareous Cheilostomata. The meat is rasped with the radula.

Like other slugs are hermaphrodites, and copulate the Goniodorididae each other. They lay their eggs in translucent Eischnüren, which hatch numerous veliger larvae, which feed on plankton and metamorphose after an extended pelagic phase to small slugs.

The Goniodorididae include, among others White stylus screw ( Ancula gibbosa ) and the White - Transparent Goniodoris ( Goniodoris nodosa ).

System

After Bouchet and Rocroi ( 2005), the family Goniodorididae one of three families in the superfamily Onchidoridoidea. This family includes seven genera:

  • Ancula Lovén, 1846
  • Goniodoris Forbes & Goodsir, 1939
  • Goniodoridella Pruvot -Fol, 1933 - only type: Goniodoridella savignyi Pruvot -Fol, 1933
  • Lophodoris G. O. Sars, 1878
  • Murphydoris Sigurdsson, 1991
  • Okenia Menke, 1830 - Synonyms: Idalia Leuckart, 1828; Idaliella Bergh, 1881; Idalina Norman, 1890; Cargoa Vogel & Schultz, 1970; Cerato Doris Gray, 1850; Hopkinsia MacFarland, 1905; Sakishimaia Hamatani, 2001; Teshia Edmunds, 1966
  • Trapania Pruvot -Fol, 1931
Heterobranchia World Register of Marine Species Integrated Taxonomic Information System
272435
de