Truncatellina callicratis
Southern cylinder whorl snail ( Truncatellina callicratis )
The Southern cylinder whorl snail ( Truncatellina callicratis ) is a snail of the family of the diaper snails ( Vertiginidae ) from the subordination of terrestrial snails ( gastropod ).
- 5.1 Literature
- 5.2 Notes and references
Features
The cylindrical housing of the Southern cylinder whorl snail is 1.6 to 2.2 mm high and 0.7 to 0.9 mm wide. The turns are moderately curved and offset from each other by a deep suture. The surface is covered with weak, irregular ribs. In some instances, the housing can be nearly smooth. deeper. The aperture is ovate, slightly higher than wide. The opening space is weakly amplified and only slightly bent, especially on the basal and spindle edge. In the typical form of three teeth lie deep in the mouth, a parietal, columellar and Palatalzahn. The palatal tooth is clearly visible in the rule in the frontal view. The teeth can be reduced more or less in some populations, or missing altogether. In such cases, the housing from the cylinder 's whorl snail ( Truncatellina cylindrica ) is hardly distinguishable.
Similar Species
The case is very similar to the cases of beaded cylinder whorl snail ( Truncatellina costulata ) and the cylinder 's whorl snail ( Truncatellina cylindrica ). The case of the cylindrical worm is is very slightly tapered. The beaded cylinder whorl snail the aperture rim is wider. The cylinder whorl snail does not have in the mouth protruding teeth. However, there are also the Southern cylindrical worm populations with poorly developed or even missing teeth. Such specimens are difficult to distinguish from each other.
Geographical distribution and habitat
The species is very scattered from Spain in the west to the Caucasus and Central Asia before. In the south of the area to Algeria dates, in the north to southern Germany and southern England. In Switzerland, the nature rises to 2200 m above sea level. In England it occurs mainly on the coasts.
The species lives in very dry calcareous grasslands in open, rocky slopes. In southern England, the species is found on cliffs and in old quarries.
Taxonomy
The taxon was described in 1833 by Arcangelo Scacchi as Turbo callicratis first time. The Fauna Europaea lists the following synonyms:
- Vertigo dinii De Stefani, 1883
- Vertigo callicratis subvar. marcuccii De Stefani, 1883
- Vertigo callicratis format Nodosaria De Stefani, 1883
- Pupa rivierana Benson, 1854
- Vertigo callicratis subvar. simii De Stefani, 1883
- Pupa strobeli Gredler, 1853
- "? Zanellia Benoit, 1858 " [Note 1]
And Kerney et al. (1983):
- Truncatellina rivierana britannica Pilsbry, 1920
Endangering
The species is threatened with extinction in Germany and is therefore listed in the hazard category 1.