Abida polyodon
| Abida polyodon | ||||||||||||
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Abida polyodon |
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| Scientific name | ||||||||||||
| Abida polyodon | ||||||||||||
| ( Draparnaud , 1801) |
Abida polyodon is a type of grain snail (Chondrinidae) from the suborder of land snails (Stylommatophora).
features
The slim to compact spindle-shaped housing is 6.3 to 15.3 mm high (usually 7 to 9 mm) and 2.5 to 4.5 mm wide. It has 8 to 10 slightly to moderately curved turns, the greatest width of which is approximately in the middle. The surface is very regular and very finely ribbed. The last turn is obliquely flattened, the diameter decreases in the cross-section. There is an indistinct keel at the base. The housing is not pressed in in the parietal area. In the side view, the palatal rim of the mouth is directed vertically to slightly downwards. The mouth edge is turned over and has a mostly strongly thickened white lip. In the parietal region, the mouth edges are connected by a thin callus. The mouth reinforcement consists of an angularis, which is connected to the Süiralis. A subangularis has developed parallel to the angularis. In the parietal region there is a strong parietalis and a long infraparietalis. Occasionally, there are still some edge wrinkles. At the edge of the locker the columellaris is designed as a high and wide lamella. It is connected with an edge fold and so apparently extends to the edge of the mouth. Marginal folds and columellaris are sometimes not clearly separated and appear as a uniform columellaris. The slightly less developed infracolumellaris is also connected with a marginal fold. In another interpretation, the columellar folds are divided into two parts. The flat outside of the columellar wall is very characteristic whitish. In the palatal region, the infrapalatalis, the palatalis inferior and the palatalis superior are designed as double humps and extend forward to the edge of the mouth or the mouth lip. In addition, a suprapalatalis and a suturalis are formed. In addition, there are still some small folds on the edge of the mouth lip. The navel can only be partially seen narrow and vertically seen from below.
In the male part of the genital apparatus, the penis and epiphallus form a loop; In the lower part of the penis, the seminal duct is fused with the penile tissue. The penis and epiphallus are roughly the same thickness. The penis / epiphallus transition is marked by a thickening slightly below the bend of the loop. The epiphallus is only about half the length of the penis. The penile retractor muscle inserts on the first sixth of the loop, i.e. below the middle of the penis length and in the first third of the epiphallus. The vagina is much shorter than the total length of the penis. The free fallopian tube and vagina are roughly the same length. The stem of the seminal vesicle (spermathec) is relatively long and at first about twice as thick at the branching of free fallopian tubes / stem of the seminal vesicle. The style and seminal vesicle are not embedded in the tissues of the prostate gland. Its length does not reach the albumin gland. In a radula half-transverse row there are 20 to 22 posterior teeth in addition to the main or central tooth. The secondary tips of the central tooth is comparatively very small.
Similar species
Abida polyodon differs from the other species of the genus Abida by the spindle-shaped and relatively large housing, the almost never missing edge folds and the flat outside of the spindle wall . The greatest similarities still exist to Abida secale lilietensis and Abida secale andorrensis . With these two subspecies of the rye grain snail , the spindle wall of the mouth is always turned slightly outwards. The outside of the spindle wall is therefore not as flat as in Abida polyodon .
Geographical distribution
The distribution area of the species extends from the Isère valley in the Var department in France as the north-easternmost occurrence over the Roussillon to the Eastern Pyrenees. The westernmost point of discovery north of the main ridge of the Pyrenees is Cierp ( Haute-Garonne , France), south of the main ridge the area extends to Navarre in Spain. Other occurrences are on the Mediterranean coast of Catalonia, mostly only a few kilometers inland. The southernmost point of discovery is La Paca in the Spanish region of Murcia .
The species prefers to live on dry limestone grasslands or in bushes. It is less common in rocky habitats. It occurs from the lowlands up to 1300 m above sea level.
Taxonomy
The taxon was first described in 1801 by Jacques Philippe Raymond Draparnaud as the Pupa polydon .
There are numerous synonyms:
- Pupa ameliae Locard, 1894
- Pupa polyodon var. Attrita Moquin-Tandon, 1856
- Pupa polyodon var. Exilis Moquin-Tandon, 1856
- Torquilla gracillima Beck, 1837
- Pupa lopezi Bech, 1973
- Pupa polyodon var. Minor Rossmaessler, 1842
- Abida polyodon montserratica f. monsjovica Aguilar-Amat, 1932
- Pupa montserratica Fagot, 1884
- Pupa polyodonta Chatenier, 1888
- Pupa polyodon var. Ringicula Kuster, 1850
- Pupa polyodon var. Ventricosa Locard, 1881
- Abida polyodon montserratica f. vidali Aguilar-Amat, 1932
Danger
According to the assessment of the International Union for Conservation of Nature and Natural Resources (IUCN), the species is not endangered (“least concern”).
supporting documents
literature
- Edmund Gittenberger: Contributions to the knowledge of the pupillacea: III. Chondrininae. Zoologische Verhandelingen, 127 (1): 3-267, 1973 ISSN 0024-1652 PDF (pp. 142ff.).
- 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. 111)
- 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
- ^ Jacques Philippe Raymond Draparnaud: Histoire naturelle des mollusques terrestres et fluviatiles de la France. Ouvrage posthumous. SI-VIII, pp. 1-134, plates 1-13, Paris, Montpellier, Plassan, Renaud. Online at www.biodiversitylibrary.org: p . 60 or plate 1, Fig. 13
- ↑ Fauna Europaea: Abida polyodon (Draparnaud 1801)
- ↑ Gargominy, O. & Gomez, B. 2011. Abida polyodon. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1., Www.iucnredlist.org. Retrieved September 14, 2013.
