Girardia tigrina
| Girardia tigrina | |
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| Species: | G. tigrina
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| Girardia tigrina (Girard, 1850)
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Girardia tigrina is a species of dugesiid native from America.[1] It has been accidentally introduced into Europe[2] and Japan.[3]
Description
G. tigrina individuals are around 10 mm in length. They have a head with two broad and short auricles. The two eyes are in two pigment-free patches. The dorsal surface of the body has numerous pigment spots.[3]
Distribution and ecology
Originally from America, Girardia tigrina has become an invasive species in Europe and Japan. Since it has been recorded for first time from Europe in 1925,[4] it has been reported from many European countries like France,[4] Germany,[5][6] Italy,[7] the Netherlands,[8] Romania,[9] or Wales.[10]
In North Wales it has been detected the displacement of the native triclad species Polycelis nigra and Polycelis tenuis by G. tigrina due to competition for food. G. tigrina is capable of a superior exploitation of food.[2]
Diet
G. tigrina is a carnivorous species that feeds on invertebrates such as oligochaetes, isopods, chironomids, snails, caddisflies, and mayflies.[2]
Karyology
The haploid number is n=8. There are diploid (2n=16) and triploid (3n=24) specimens.[3]
References
- ^ Ball, I. R.: A contribution to the phylogeny and biogeography of the freshwater triclads (Platyhelminthes: Turbellaria). Biology of the Turbellaria (Edited by: Riser NW and Morse MP). New York: McGraw-Hill New York 1974 , 339-401.
- ^ a b c Template:Cite DOI
- ^ a b c Sluys, R., Kawakatsu, M., Yamamoto, K., 2010. "Exotic freshwater planarians currently known from Japan". Belgian Journal of Zoology, 140 (Suppl.). p. 103-109
- ^ a b Template:Cite DOI
- ^ Meinken (H.)., 1925. Ein verkannter Laichraùher — Wochenschrift fur Aquarien und Terrarienkunde, 22 S : 94-96.
- ^ Meinken (H.)., 1927. Planaria maculata, ein aus Nordamerika eingeschleffter Laichriiber und seine Vertilgung — Blatter fiir Aquarien und Terrarienkunde, 38 S : 131-133.
- ^ Benazzi M., 1970. Karyological research on the American planarians Dugesia dorotocephala and Dugesia tigrina. J. Biol. Psychol. / Worm Runner's Digest, XII (1): 81-82.
- ^ Template:Cite DOI
- ^ An der Lan (H.)., 1962. Zur Turbellarien Fauna der Danau. Arch. Hydrobiol., suppl., 2 7 : 3-27.
- ^ Gee, H., 1990. The biology of the immigrant triclad Dugesia tigrina, Girard): a comparative study with native triclad species. Unpublished Ph.D. Thesis, University of Liverpool, England.