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Trochoidea trochoides (Poiret, 1789)
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Species name:
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Trochoidea trochoides (Poiret, 1789)
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Taxon name:
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Helix trochoides Poiret, 1789
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Originally described in:
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Poiret, J. L. M. 1789. Voyage en Barbarie, ou lettres écrites de l'ancienne Numidie pendant les années 1785 & 1786, sur la religion, les coutumes & les mœurs des maures & des arabes-bédouins; avec un essai sur l'histoire naturelle de ce pays. Seconde partie. - pp. [1-2], 1-315, [1-4]. Paris. (La Rochelle).
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Distribution:
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W Mediterranean region (Algeria to Tunisia and Spain to Adriatic coasts)
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Diagnosis:
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Shell opaque whitish or yellowish, sometimes with a brown colour band, on lower side with some partly interrupted narrow bands, striated, 5.5-6 convex whorls, prominently keeled, last whorl convex on upper side, much less convex on lower side, aperture oblique and broad with white lip inside, margin sharp, umbilicus open.
Much like Trochoidea pyramidata, but whorls more step-like with keel, lower side more flattened, umbilicus narrower. Tro. elegans is larger and has flat whorls.
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Size:
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6-8 x 6-8 mm
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Biology:
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Dry vegetation in coastal vicinity, usually in dunes, also in ruderal habitats with similar vegetation, up to 900 m.
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Threatened:
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In Spain threatened by destruction of dune habitats, populations in Alicante and Castellón might already be extinct.
Red List Spain: Vulnerable (Gómez Moliner et al. 2001, Verdú & Galante 2006).
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Family:
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Hygromiidae
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Higher group:
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Gastropoda
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Comments:
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References: Westerlund 1889: 355, Falkner 1990: 216, Manganelli et al. 1995: 30, Štamol & Velkovrh 1995 (Croatia: Cres, 1 station taken from Frank 1991), Gómez Moliner et al. 2001: 136, Martínez-Ortí & Robles 2003: 126 (Cataluña to Alicante, Illes Balears except Formentera)), Quintana Cardona 2006 (Menorca, introduced), Puente et al. in Verdú & Galante 2006: 383, www.naturamediterraneo.com (2007), Beckmann 2007: 95 (Mallorca, Menorca, Cabrera, Ibiza), Welter-Schultes 2012: 517 (range map).
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