Alzoniella navarrensis Bœters, 1999
Very probably stygobiont (animal eyeless).
Shell more slender that in elliptica. The whorls are « fairly convex, smooth and only very faindy striped. Last whorl forms more than half of the total height of the shell. Aperture slightly slanted and egg-shaped. Edge of the aperture sharp, neither thickened nor widened. The aperture touches the last whorl over a short distance; more basally there is an umbilical slit. The area of the umbilicus is thickened inside the shell, which can be seen through the transparent shell wall. » – H. D. Boeters: “Alzoniella navarrensis n. sp., Pseudamnicola (Corrosella) hydrobiopsis n. sp. and the type species of Pseudamnicola Paulucci, 1878”, Basteria vol. 63, year 1999, p.77. The suture is more marked than in the sympatric elliptica but the subsutural ramp is much narrower.
Above: a specimen from the type locality at Arnéguy (« …well (iron pipe) about 300m Northeast of the church and on the right side of the street… » – Bœters: Ibid.). 1,8mm. Altitude ≈ 270m.
