Belgrandiella saxatilis (Reyniés, 1844) |
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Occitania. Also some spots in the Garonne drainage basin. Original taxon: Paludina saxatilis.
Crenobiont. Above and below: specimens at the type-locality, Renyés, upstream Montauban, Tarn river, south France. Original pictures provided by A. Bertrand (FR) – (CC BY-NC-SA). |
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« Fragile, thin, slightly transparent, of a very light fawn colour […] Operculum: thick, fawn, darker than the shell […] Animal: greysish above, paler below. » – P. de Reyniés: Lettre à M. Moquin-Tandon sur quelques mollusques terrestres et fluviatiles, Montauban 1844, p.7. |
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| This specimen comes from a warm karst spring on the western side of the Agly river, Clue de la Fou, Saint-Paul-de-Fenouillet, Pyrénées-Orientales. Altitude ≈ 280m. 2,5mm. |
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| Shape variation in three young shells from the spring. 1,75-1,92mm. |
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| This western warm spring, at the foot of a crevice. |
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| Another shell of saxatilis from this spring. 2,55mm. |
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| Same spot. 2,2-2,3-2,35mm. |
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| Same spot. 2,35-2,20-2,15mm. |
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| Same spot. 2,85-2,40-2,70mm. |
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The old bridge over the Agly, Clue de la Fou, viewed from the south. The western spring (at left) is located upstream this bridge. An eastern spring exists also, located also upstream, in a small tunnel next to the road at right. Its water is as warm as that of the western emergence. And a few meters upstream on the same side, a last dripping, cooler than the previous ones, provides an undescribed Moitessieria. |
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| The eastern spring and its sink in which live also saxatilis, together with some other species. |
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| Three specimens from this eastern spring. 2,70-2,35-2,55mm. |
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| A magnificent specimen from the emergence of the Sarrazine cave-river, Ruisseau de Goutte-Rouge, in the Arize drainage basin. Alzen, Ariège. Altitude ≈ 640m. 2,5mm. |
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| A high-spired specimen from the same spring. 2,9mm. |
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Growth set and shape variations. Same spot. 1,15-2,9mm.
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