Bythiospeum haeussleri (Clessin, 1890) |
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Cave rivers of Haut-Rhin, Doubs, Jura, Haute-Saône, Ain, Chartreuse massif and Vercors.
Above: specimens collected in sedimentary deposits at the karst-spring of Les Hoteaux cave-river, territory of Rossillon, Ain, in the center of the Bugey massif. Altitude ≈ 380m. 2,8-2,85mm. |
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Basionym: Vitrella haeussleri. Possible synonyms: alpinum, dorvani, francomontanum…
« Whorls 6-7, slightly convex, but separated from each other by deep sutures; the whorls increase slowly and regularly; the last one occupies only a little more than a quarter of the total srell length and is slightly swollen; aperture narrowly oval, pointed upwards; margin of the aperture only slightly expanded, sharp, connected by a very thin callus; operculum not observed. » – S. Clessin: Die Mollusken- Fauna Mitteleuropa’s Bd.2;T.2, Nürnberg 1890, p.630-631. – Same spot. 2,85mm. |
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| Les Hoteaux. Sizes of the three on top: 2,85-3,6mm. |
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A specimen from the Pissoir cave-river, Torcieu, Ain, in the SW. end of the Bugey massif.
Altitude ≈ 310m. 3,05mm. |
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| Growth set from the same spot. 2,05-2,50-3,00-3,05mm. |
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| A “francomontanum” collected in sediments, karst spring of the Largue river on the territory of Oberlarg, Glaserberg massif, Sundgau area, southern Haut-Rhin. Altitude ≈ 550m. R. Bernasconi legit, 1958. 2,5mm. The aperture is narrower than in average haeussleri. |
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| Same spring. 2,85mm. On this specimen, the aperture is larger. |
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| Top: specimens from the emergence located near Les Sillots, about 50m below the Bisontin Cave, Liebvillers, Doubs. 2,8-3-3,9mm. Altitude ≈ 545m. Bottom: the chamber of Beaumes-Berceau, in the Bisontin cave. Original picture provided by Espirat for Wikimedia Commons – (CC BY-SA). |
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| Grande source de la Cuisance, Les Planches-près-Arbois, Jura. 3,15-3,4-3,5mm. Altitude ≈ 350m. |
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In the karst spring of Bléfond (type-locality of charpyi), in the Doubs. 3,6mm. Altitude ≈ 310m.
The shell is more or less stocky, but the aperture of adult specimens is markedly expanded, with a rounded anterior lip and an angular posterior margin.
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