Theodoxus arctilineatus
(G. B. Sowerby II, 1849)
N. Morocco.
Grazer, on stones and rocks in lakes and small freshwater streams. Protonym: 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.
Same spot. 5,6mm.
The anterior abutment is somewhat similar to that of baeticus-meridionalis, but the marginal callus is obsolete.

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