Renea bourguignatiana
Renea bourguignatiana
Renea bourguignatiana is a living on the land snail from the family of Mulmnadeln ( Aciculidae ) in order Architaenioglossa ("old Bandzüngler "). The distribution area is limited to a very small area at Menton in the Alpes- Maritimes and Ventimiglia (Liguria ) on the French- Italian border.
- 5.1 Literature
- 5.2 Notes and references
- 5.3 External links
Features
The (adult ) case measures 3.3 to 3.8 mm in height and 1.0 to 1.05 mm in width. It is cylindrical - fusiform with 7 ¼ to 8 moderately to weakly convex whorls. The last three turns are approximately the same width, the last turn is significantly flattened. The Protokonch with 1 ¾ is smooth, then put a fine ribs. Even the penultimate whorl there are 54 to 64 ribs. The mouth is U-shaped in frontal view and comparatively narrow. The Flipped outward opening edge is wide, the inside of the rim is thickened greatly lipped. In the side view of Palatalrand ( = outside ) edge of the estuary is strongly curved forward, the peak of the curve lies below the center of the coil is located. The regularity of the bend is released shortly before the incidence on the penultimate turn. Thus there is formed from a deep sinus. A real Sinulus such as at Renea paillona but is not formed. It is not formed neck ridge, also lacks a angularis. The Parietalkallus is designed as a flat elongated cusps. Shortly before and slightly to the left of the spindle it is more pronounced. The umbilicus is closed by a narrow offshoot of this callus.
The casing is colored brown horn.
Similar Species
Renea moutonii similar but Renea bourguignatiana is taller, slimmer and has a narrower mouth edge. In Renea paillona the mouth in the frontal view is broader and the muzzle lip is not so much thickened.
Geographical distribution and habitat
The species was originally described from Pleistocene or postglacial deposits in the Gorge de St. Louis in Menton ( Alpes -Maritimes, France). Only about 10 km northeast of the type locality in 1977 were more specimens have been found. Also in 1977 live animals were found at Ventimiglia ( Imperia province, Italy) then.
The species lives in mesophilic forests with European hop hornbeam ( Ostrya carpinifolia ), downy oak (Quercus pubescens) and holm oak (Quercus ilex) in the moist leaf litter.
Taxonomy
The taxon was described in 1880 by Geoffrey Nevill first time. It is the type species of the genus Renea Nevill, 1880. Locus typicus The is the Gorge de St. Louis in Menton ( Alpes -Maritimes, France).
Endangering
The " IUCN Red List of Threatened Species " classified the species as " critically endangered " ( = threatened with extinction ) a.