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Gyraulus chinensis (Dunker, 1848)
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Species name:
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Gyraulus chinensis (Dunker, 1848)
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Taxon name:
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Planorbis chinensis Dunker, 1848
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Originally described in:
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Dunker, G. 1848. Diagnoses specierum novarum generis Planorbis collectionis Cumingianæ. - Proceedings of the Zoological Society of London 16: 40-43.
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Distribution:
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E and S Asia (Iran to India, Korea, S Japan and Neuguinea), introduced with rice crops to other parts of the world, for example N Italy (rice crop regions, also in Liguria), Spain, Portugal and S France (Camargue), also to greenhouses in central and N Europe
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Diagnosis:
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Shell light horny coloured, thin, translucent, shiny, striated and sometimes with fine spiral lines forming a fine reticulate pattern and spirally arranged short hairs, upper side concave, lower side flat, 3.5-4 whorls, last whorl broadened, aperture slightly bent to the upper side.
The animal is light grey, head and foot with blackish spots.
Flatter than G. albus, whorls increasing more slowly, mantle with large pigment patches visible from outside the shell.
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Size:
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0.8-1.5 x 3-5 mm
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Biology:
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In rice crops, occasionally in thermal springs. Survives in central and N European greenhouses and fish tanks, but not outside.
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Threatened:
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Family:
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Planorbidae
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Higher group:
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Gastropoda
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Comments:
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References: Meier-Brook 1983: 97, Falkner 1990: 134, Manganelli et al. 1995: 11, Brown et al. 1998, Glöer 2002: 271, Anderson 2005, Beran & Glöer 2006, Welter-Schultes 2012: 62 (range map Europe).
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