Moitessieria fontsaintei Bertrand, 2001

Stygobiont. Ariège and Pyrénées-Orientales, in karstic flows at high altitudes.
Above and below: spring of Font-Sainte (type locality), Ustou, Ariège. Altitude ≈ 620m. 1,8-2mm.

Auriform peristome with sometimes the presence of a sinus in the upper end.

Sculpture very thin, made up of spiral cords crossed by radial folds, drawing a reticulate network of cells, inside which one can distinguish, especially on the teleoconch, some small undulations. 1- Rice grain microsculpture of the protoconch, typical of the species. 2- Cancellate surface of the first whorl of the teleoconch, with the pattern of undulations. 3- Sculpture on the third whorl.

Another specimen, less slender than the precedings, from the same karst spring. 1,85mm.

The species shows a marked angle on the adapical extremity of the lip.
Same spot. 1,80-1,95mm.

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