Theodoxus arctilineatus (Sowerby II, 1849)
N. Morocco.
Grazer, on stones and rocks in lakes and small freshwater streams. Original taxon: Neritina arctilineata.
 
« Of an obliquely subovate form, grey, with purplish, undulated lines; spire short; aperture rather expanded; columella semicircular, flat, orange-coloured, smooth.  » – L. A. Reeve: “Monograph of the genus Neritina”, Conchologia Iconica vol. IX, London 1856, p.531, species 83.

Hassi Bella area, Jerada, Oriental. 6mm.

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