Spiralix vitrea (Drapanaud, 1801)
Karstic aquifers and phreatic zones in alluvial plains of Ain, Isère, Rhône, maybe Drôme and Ardèche. Les Hoteaux emergence, near Rossillon, Ain. Altitude ≈ 380m. 2,7mm.
Same spot. 2,5mm.
Spiralix vitrea (Drapanaud, 1801) |
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| Stygobiont. Karstic aquifers and phreatic zones in alluvial plains of Ain, Isère, Rhône, maybe Drôme and Ardèche. Les Hoteaux emergence, near Rossillon, Ain. Altitude ≈ 380m. 2,7mm. |
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| There is hardly any microsculpture. When visible, especially on the last whorl, it is made of weak spiral striae crossed by thin radial folds. Protoconch smooth. Same spot. 2,5mm. |
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| Variation in the convexity of the worls in the population of Les Hoteaux, Rossillon. 2,4-2,75mm. |
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| Convex whorls come together with a rounded aperture; flatter whorls generate a more ovate aperture, with a less undulating labial margin. 2,2-2,5mm. |
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| Large specimen from the Pissoir cave-river, Torcieu, Ain. Altitude ≈ 310m. 3,1mm. |
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| Same spot. 2,6mm. |
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