Acicula disjuncta
| Acicula disjuncta | ||||||||||||
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| Scientific name | ||||||||||||
| Acicula disjuncta | ||||||||||||
| Boeters , Gittenberger & Subai , 1989 |
Acicula disjuncta is a land-living snail from the family of the Mulmnadeln (Aciculidae) in the order of the Architaenioglossa ("old bandworm").
features
The right-hand wound, comparatively very large, spindle-shaped to very slender conical housing is 4.6 to 6.2 mm high and 1.7 to 1.95 mm wide. Acicula disjuncta is the largest known Acicula species. However, the two populations of the species are slightly different in size on average. The case has 6.25 turns with a deep seam. A more or less distinct edge is formed below the seam, but a distinct suture thread is missing. The protoconch is smooth. This is followed by a short section with very weak, tight radial grooves. On the penultimate turn there are then 13 to 20 grooves. Further grooves start from the seam, but end more or less far in front of the base.
The mouth rises significantly on the penultimate passage. In the frontal view it is oblique pear-shaped to rounded trapezoidal. In the side view, the mouth edge is slightly convex in the middle; a sinulus is not or only indistinctly developed. The edge of the mouth is slightly thickened on the inner edge. In the navel area, the edge of the mouth is turned over and placed narrowly callus-like over the navel. An angularis is more or less clearly developed. A parietal callus is present and clearly delimited to the outside, the edge is occasionally thickened like a thread. The neck bulge is only weakly developed and extends from the seam of the penultimate turn to the navel. The front edge of the neck bulge forms the edge of the mouth or lies just behind it when the edge of the mouth is widened. The case is brownish in color.
Similar species
Acicula disjuncta can be distinguished from all other Acicula species by its size . The second largest species, Acicula beneckei , has a pronounced sinulus in the upper part of the palatal margin of the mouth. Also in the geographically closest species or its subspecies Acicula lineolata banki , the edge of the mouth has a sinulus in side view.
Geographical distribution
The species has so far only been found in two disjoint areas. It is known from a site near Catanzaro (1.5 to 2 km northeast of Tiriolo in the direction of Gimigliano ) in Apulia ( Italy ) and from a few sites on the Croatian Adriatic coast .
Taxonomy
The taxon was described by Hans D. Boeters , Edmund Gittenberger and Péter Subai in 1989. The specific epithet disjuncta refers to the disjoint distribution area. The population in Puglia is on average slightly larger (height 5.4 to 6.2 mm, width 1.80 to 1.95 mm) than the Croatian population (4.6 to 5.0 mm high and 1.7 mm wide ). The first descriptors excluded the status of subspecies for the two populations.
supporting documents
literature
- Hans D. Boeters, Edmund Gittenberger, Péter Subai: The Aciculidae (Mollusca, Gastropoda, Prosobranchia) . Zoologische Verhandelingen, 252, pp. 1-234, Leiden 1989. PDF
- Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. A1-A3 S., 679 S., Q1-Q78 S., Planet Poster Ed., Göttingen 2012 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5
On-line
Web links
- Fauna Europaea: Acicula disjuncta Boeters, Gittenberger & Subai, 1989
- Acicula disjuncta onthe IUCN 2013 Red List of Threatened Species . Posted by: Feher, Z., 2010. Retrieved February 13, 2014.