Sphincterochila zonata zonata

The aperture is thickened, projecting internally in two subconcrescent denticles (described by Tryon as "tubercles").

[4] This species presents adaptations to arid conditions which significantly improve its desiccation tolerance.

These snails dig themselves into the soil to depths from 1 to 5 cm while they aestivate during summer in the Negev Desert.

[3] In the vicinity of the Dead Sea, they usually either burrow to depths of up to 10 cm, or aestivate hidden under stones.

[6] The soft parts of the animal's body shelter inside the second and the third whorl of its shell, where the temperature can reach up to 50.3 °C.

Temperatures of up to 56.2 °C were measured and are known to occur inside the shell's body whorl, which is mostly filled with air during aestivation.

[6] Schmidt-Nielsen et al. in 1971[6] estimated their life span according to their oxygen consumption as being nearly 8 years.

[6] The known predators of Sphincterochila zonata zonata are rodents, namely the Cairo Spiny Mouse (Acomys cahirinus), Wagner's Gerbil (Dipodillus dasyurus) and the Asian Garden Dormouse (Eliomys melanurus).

Sphincterochila zonata zonata in Hamakhtesh Hagadol , northern Negev. Diameter is 2.1 cm.
Sphincterochila zonata zonata shells below a limestone wall in Hamakhtesh Hagadol, northern Negev.