Azeca goodalli

Dentate Straight screw ( Azeca good alli )

The dentate Straight screw ( Azeca good alli ), also called the dentate agate snail, a terrestrial snail from the family of smooth snails ( Cochlicopidae ). It is the only species of the genus Azeca Fleming, 1828th


The case measures 5-8 mm in height and 2.4 to 3 mm in width (from 5.3 to 6.8 mm high, 2,4 to 2.7 mm wide). The bulbous - shaped spindle housing has 6 ½ to 7 flat whorls, which are deposited by a flat rinnige seam. It is not formed umbilicus. It is whitish, yellowish, yellowish brown to reddish and translucent. If the animal has withdrawn into the housing, the last whorls appear dark through the dark body. The surface is very shiny.

The crooked mouth ( in relation to the housing longitudinal axis ) is pear-shaped in outline. The lipped thickened, whitish aperture rim moves the entire mouth; it is slightly curved inwards, also basally slightly inflected. The mouth of the last intercourse is interiorly up to six teeth and wrinkles, a palatal, a parietal to three and one to two columellare.

Geographical distribution, habitat and behavior

The dentate Straight screw comes from northern Spain over France, Belgium to England in the north of Germany and in the East ( eastern deposits in Thuringia). The presence in Schleswig- Holstein is probably extinct. However, it is not a contiguous area of ​​distribution, but to each individual, isolated occurrence. Fossil occurrences are known from Austria and the Czech Republic.

The species lives in the leaf litter, in damp shed leaves and moss lights mixed forests with low vegetation, in bushes and hedges, usually with calcareous subsoil and often on rocky sites. However, it should be available through the vegetation or leaf litter a humidity of 80 to 90%. The animals sit at such locations on the underside of stones or dead wood.

Systematics and Taxonomy

The taxon was by André Étienne Justin Pascal Joseph François d' Audebard de Ferussac under the name Helix ( Cochlodonta ) good alli first described scientifically. It is the type species of the monotypic genus Azeca Fleming, 1828th The genus is the type genus of the Azecidae Kennard & Woodward 1926 family, the. Madeira et al (2010) is seen as a distinct family. After this molecular genetic study Azecidae and Cochlicopidae are not sister groups and not directly related to each other. This taxon was considered by Bouchet & Rocroi (2005) as a subfamily of Cochlicopidae. Schileyko (1998 ) considers that the Azecidae / Azecinae as a synonym of Cochlicopidae.


Due to the very small local occurrence, the species is generally compromised, the small populations can be wiped out quickly by changes in the locations. In Germany, the species is considered endangered. In the individual German states, the situation is partly different. So the way in Bavaria is already classified as endangered.


Pictures of Azeca goodalli