Fiona pinnata

from Wikipedia, the free encyclopedia
Fiona pinnata
Fiona pinnata and her favorite food: barnacles

Fiona pinnata and her favorite food: barnacles

Systematics
Order : Hind gill snails (Opisthobranchia)
Subordination : Nudibranchia (Nudibranchia)
Partial order : Thread snails (Aeolidida)
Family : Fionidae
Genre : Fiona
Type : Fiona pinnata
Scientific name of the  family
Fionidae
Gray , 1857
Scientific name of the  genus
Fiona
Alder & Hancock , 1851
Scientific name of the  species
Fiona pinnata
( Eschscholtz , 1831)

Fiona pinnata ( Syn. : Coryphella pinnata ) is a small pelagic caseless screw from the subordination of the sea slugs , which lives at flotsam and mainly of barnacles fed. It is the only species of the monotypic genus Fiona and family Fionidae .

features

Fiona pinnata has an elongated, elliptical body, which in adult snails can usually be 2 cm, sometimes up to 5 cm. Depending on the nutritional situation, the head and torso are white to brown or purple in color. The long, lanceolate foot is rounded at the front and pointed at the back. The edge of the foot is thin, frayed and wrinkled, only with entire margins on the head, where it is divided but without projections. Fiona pinnata has mouth feelers and smooth rhinophores very similar to them , but it has no eyes.

The snail has numerous elongated cerata on the two edges of its back with a membrane on the inside. The middle of the back is free of appendages. There are also small cerata on the outside. The Cerata appear mostly irregular, but they are arranged in oblique rows of 4 to 6 Cerata. The outer cerata are dark brown with a white border. Unlike other thread snails , Fiona pinnata has no nettle sacs and does not store nettle capsules.

The teeth of the single-row radula have a central hump and some lateral teeth. The two horny jaws have serrated edges. The anus is located on the right back between the cerata. As a hermaphrodite, the snail has a male and a female genital opening, an unreinforced penis and two receptacula seminis .

Life cycle

Two snails mate with each other and attach their gelatinous clutches to the flotsam, in whose transparent shell you can see the numerous eggs. Numerous Veliger larvae hatch from these and after a few days they metamorphose into small, caseless snails when they come into contact with a suitable substrate .

Distribution and way of life

Fiona pinnata is common in warm and temperate seas around the world. Here it can be found on various floating objects, where its prey, barnacles , also live. The snail does not swim itself, but depends on the debris. Fiona pinnata has been found on young and adult loggerhead turtles in the Canary Islands .

Fiona pinnata primarily eats barnacles of the Lepas genus , namely Lepas anatifera , Lepas anserifera , Lepas hilli and Lepas testudinata , but also Dosima fascicularis , which grow on flotsam. Other barnacles such as Pollicipes polymerus or barnacles such as Balanus glandula are only eaten when they are injured or weakened. Also cnidarians as Velella velella and Porpita Porpita be eaten.

literature

  • FM Bayer (1963): Observations on pelagic molluscs associated with the siphonophores Velella and Physalia . Bulletin of Marine Science of the Gulf and Caribbean, University of Miami 13 (3), pp. 454-466.
  • Robert D. Beeman, Gary C. Williams (1980): Chapter 14. Opisthobranchia and Pulmonata: the sea slugs and allies . Pp. 308-354, Pls. 95-111. In: Robert Hugh Morris, Donald Putnam Abbott, Eugene Clinton Haderlie: Intertidal invertebrates of California , ix + 690 p., 200 plates. Stanford University Press. P. 338.
  • Rudolph Bergh (1859): Contributions to a monograph of the genus Fiona, Hanc . Copenhagen, pp. 1–20, plates 1–2.
  • R. Bieri (1966): Feeding preferences and rates of the snail, Ianthina prolongata, the barnacle, Lepas anserifera, the nudibranchs, Glaucus atlanticus and Fiona pinnata, and the food web in the marine neuston . Publications of the Seto Marine Biological Laboratory 14, pp. 161-170, panels III-IV.
  • Dana Brackenridge Casteel (1904): Cell Lineage and Early Larval Development of Fiona marina, a Nudibranch Mollusk . Proceedings of the Academy of Natural Sciences of Philadelphia 1 (6), pp. 325-405.
  • RF Burn (1966): Descriptions of Australian Eolidacea (Mollusca: Opisthobranchia): 4. The genera Pleurolidia, Fiona, Learchis, and Cerberilla from Lord Howe Island . Journal of the Malacological Society of Australia (10), pp. 21-34.
  • JJ Holleman (1972): Observations on growth, feeding, reproduction, and development in the opisthobranch Fiona pinnata (Eschscholtz) . Veliger 15 (2), pp. 142-146.
  • John Gwyn Jeffreys (1869): British conchology: or, an account of the Mollusca which now inhabit the British Isles and the surrounding seas . J. Van Voorst, London. Volume 5, page 35 , plate 2, Fig. 2 .
  • Carol M. Lalli, Ronald W. Gilmer: Pelagic snails: the biology of holoplanktonic gastropod mollusks .
  • Arthur William Baden Powell : New Zealand Mollusca . William Collins Publishers, Auckland (New Zealand) 1979. ISBN 0-00-216906-1
  • H. Suter (1913): Manual of the New Zealand Mollusca . Wellington, 1120 pp. 586-587. ( Archive.org )
  • RC Willan (1979): New Zealand locality records for the aeolid nudibranch Fiona pinnata (Eschscholtz) (PDF; 1.8 MB) . Tane 25.

Web links

Commons : Fiona pinnata  - collection of images, videos and audio files

Individual evidence

  1. ↑ AL Loza, LF López-Jurado (2008): Comparative study of the epibionts on the pelagic and mature female loggerhead turtles on the Canary and Cape Verde Islands . P. 100. In: Mast RB, Hutchinson BJ & Hutchinson AH (Eds.). (2007). Proceedings of the Twenty-Fourth Annual Symposium on Sea Turtle Biology and Conservation (PDF; 1.3 MB). NOAA Technical Memorandum NMFS-SEFSC-567, 205 pp.