Alzoniella cf. Alzoniella perrisii (Dupuy, 1851)

Known distribution: Landes (locus typicus at Mont-de-Marsan); Pyrénées-Atlantiques, in the territory of Mouguerre. Crenobiont. Original taxon: Hydrobia perrisii.
The peristome seems to be thicker, especially on the collumelar side, than in elliptica or navarrensis. Umbilical slit not visible. Above, a shell collected in the spring at the end of Arrapidekopareta, Arrapidea. 1,75mm. Altitude ≈ 100m.

Subadults from the same spot. 1,35-1,4mm.

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