Dainty sludge needle
| Dainty sludge needle | ||||||||||||
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Delicate sludge needle ( Platyla gracilis ) |
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| Scientific name | ||||||||||||
| Platyla gracilis | ||||||||||||
| Clessin , 1877 |
The dainty needle ( Platyla gracilis ), also dainty needle snail, is a land-living snail from the family of mulm needles (Aciculidae) in the order of the architaenioglossa ("old bandworm").
features
The medium-sized cases of the Dainty Mulmnadel are 2.05 to 3.45 mm high and 0.80 to 1.25 mm wide. They are very slender, fusiform to conical. They have 4¾ to 6¼ slightly arched turns with a moderately deep seam, and under the seam with a pronounced edge. The last turn is less than half the total height. The mouth already rises slightly with the penultimate mouth. In the frontal view, the mouth is crooked, pear-shaped, the edge of the mouth is enlarged. In the side view, the edge of the mouth recedes below and forms an only hinted sinulus further above. There is a callus in the parietal area of the mouth , whereas the angularis is poorly developed. The thin and narrow umbilical callus is also only partially recognizable. On the other hand, the neck bulge is high, but narrow, sharply delimited to the rear, and slopes slightly concave. The mouth height is 0.70 to 0.95 mm, the mouth width 0.5 to 0.7 mm. The reddish to yellow-brown housing is matt glossy and translucent.
Similar species
The housing of the dainty sludge needle is very similar to the housing of the smooth sludge needle . However, it is smaller and slimmer and the coils are less arched. The mouth is narrower, the umbilical callus is only partially recognizable. The shell surface has a rather matt sheen, but the shell is more translucent. The neck bulge is similarly high, but significantly narrower. The Petite Mulmnadel differs from Platyla pezzolii in its smaller and slimmer housing. The seam edge is more pronounced and the neck bulge is narrower and lower. The housing of the Platyla orthostoma is larger than the dainty sludge needle. It has no seam edge and the neck bulge is narrower and flatter.
Geographical distribution and occurrence
The distribution area of the Zierlicher Mulmnadel is heavily fragmented. There are basically four distribution centers: the Berchtesgadener - Salzburg area; an area that extends from southern Carinthia via north-eastern Italy and Slovenia to western Croatia ; Central Italy and Greece .
It lives there in scree slopes and deciduous forests on calcareous soil.
Taxonomy
The taxon was described for the first time in 1877 by Stephan Clessin as Acme gracilis . The Fauna Europaea has three synonyms :
- Acicula graeca Subai 1976
- Acme rothi Clessin 1911
- Acme trigonostoma Paladilhe 1868
Danger
The species is classified as extremely rare on Germany's Red List.
supporting documents
literature
- Hans D. Boeters, Edmund Gittenberger, Péter Subai: The Aciculidae (Mollusca, Gastropoda, Prosobranchia) . Zoologische Verhandelingen, 252: pp. 1-234, Leiden 1989. PDF
- Michael P. Kerney, RAD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 pp., Paul Parey, Hamburg & Berlin 1983 ISBN 3-490-17918-8 (p. 72)
- Vollrath Wiese: Germany's land snails. 352 pp., Quelle & Meyer, Wiebelsheim 2014 ISBN 978-3-494-01551-4 (p. 30/1)
- 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., Göttingen, Planet Poster Ed., 2012 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5
Individual evidence
- ↑ Stephan Clessin: New Acme species. Bulletin of the German Malakozoological Society, 43 (4): pp. 165–167, 1911 Online at www.biodiversitylibrary.org .
- ↑ Fauna Europea: Platyla gracilis
- ↑ Margret Binot-Hafke, Sandra Balzer, Nadine Becker, Horst Gruttke, Heiko Haupt, Natalie Hofbauer, Gerhard Ludwig, Günter Matzke-Hajek, Melanie Strauch (Red.): Red List of Endangered Animals, Plants and Mushrooms in Germany. Volume 3: Invertebrates (Part 1). 716 p., Federal Agency for Nature Conservation, Bonn-Bad Godesberg 2012 (Nature Conservation and Biological Diversity 70 (3)) ISBN 978-3-7843-5231-2
On-line
Web links
- Molluscs of central Europe Platyla gracilis
- Platyla gracilis inthe IUCN 2013 Red List of Threatened Species . Posted by: Neubert, E., Falkner, G., Falkner, M. & von Proschwitz, T., 2011. Accessed February 14, 2014.