Abida cylindrica
| Abida cylindrica | ||||||||||||
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Abida cylindrica |
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| Scientific name | ||||||||||||
| Abida cylindrica | ||||||||||||
| ( Michaud , 1829) |
Abida cylindrica is a type of grain snail (Chondrinidae) from the suborder of land snails (Stylommatophora).
features
The cylindrical case is 6.2 to 8.6 mm high and 2.7 to 3.0 mm wide. It has 9.5 to 11.5 moderately to strongly arched turns and a comparatively short, rounded apex . The surface is fine and regularly ribbed or striped. The muzzle is narrowed at the side only slightly and slightly obliquely to the housing axis, so that it is only slightly higher than it is wide in cross section. The base is slightly keeled. In the side view, the palatal edge of the mouth is directed upwards. The edge of the mouth has an indicated sill-shaped, strongly thickened white lip. In the parietal area, the mouth edges are connected by a usually very pronounced callus.
The mouth reinforcement consists of an angularis that is not connected to the spiral. It extends over the anterior end of the parietalis into the interior of the mouth. The subangularis has the shape of a short lamella and runs parallel to the angularis. The parietalis starts wide at the mouth and becomes narrower towards the inside. In addition to an infraparietalis, edge wrinkles can also occur. The Columellaris sits very high on the spindle and can stretch close to the Columellar wall up to the mouth lip. The infracolumellaris is designed as a tall, narrow lamella. It descends slightly around the spindle and forwards. It ends there or continues in a slightly wider or lower shape and then rises again slightly. The superior palatalis (upper palatal tooth), the inferior palatalis (lower palatal tooth) and the infrapalatalis are designed as double cusps and reach the edge of the mouth or the mouth lip at the front. There is also a suprapalatalis and often a suturalis. There are still some small folds on the edge of the mouth. The housing is slightly indented and notched in the area of the infrapalatalis, starting from the mouth area. A short longitudinal furrow starts from the edge of the mouth. The housing at the point of the upper palatal tooth is not or only slightly indented. The cylindrically shaped umbilicus is wide open (viewed vertically from below).
In the male part of the genital apparatus there is a penis and epiphallus . The lower part of the penis and epiphallus are fused with tissue and form a loop. The penis is significantly longer than the epiphallus, the transition from the epiphallus to the penis is marked by a kink and an indistinct narrowing. The spermatic duct is only slightly twisted and free; that is, it is not integrated into the tissue in the lower part of the penis. The penile retractor muscle starts just below the center of the loop of the penis and epiphallus. The inner wall of the penis has six transversely furrowed longitudinal folds; in the epiphallus there are four transversely furrowed longitudinal folds. The vagina is less than half the length of the penis, but is about as long as the free fallopian tube. The stem of the seminal vesicle is very long, the seminal vesicle itself is elongated and only slightly wider than the stalk. It is at the branching fallopian tube peduncle of the seminal vesicle about twice as thick as the fallopian tube. The diameter then decreases to less than half, and then becomes a little thicker again towards the "bubble". The seminal vesicle is not embedded in the tissue of the prostate gland and does not reach the albumin gland. The radula has 18 to 19 posterior teeth in a semi-transverse row next to the central tooth.
Similar species
Abida cylindrica has a great resemblance to Abida gittenbergeri due to its cylindrical housing , but differs due to the reinforcement of the mouth. The mouth reinforcement is again very similar to Abida partioti . However, this type differs in the shape of the housing.
Geographical distribution and habitat
The distribution area of Abida cylindrica is limited to the Eastern Pyrenees (up to the Rio Segre in the west). The main area of distribution is the areas south of the main Pyrenees ridge; only a few records are found in areas north of the main Pyrenees ridge. The animals live there under stones and under the leaf litter.
Taxonomy
The taxon was set up as Pupa cylindrica by André Louis Gaspard Michaud as early as 1829 . Later authors assigned them to the genus Sandahlia Westerlund, 1887. Sandahlia Westerlund, 1887 is now considered a synonym for the genus Abida . Type species of Sandahlia is Pupa cylindrica Michaud, 1829 by monotype . Edmund Gittenberger lists the following synonyms :
- Orcula corrugata Locard, 1894
- Pupa cylindrica var. Curta Moquin-Tandon, 1856
- Sandahlia cylindrica curtata Pilsbry, 1918
- Orcula cylindriformis Locard, 1894
- Pupa dufourii Dupuy, 1850
- Pupa cylindrica var. Echthrodes Westerlund, 1887
- Pupa cylindrica var. Elongatissima Dupuy, 1879
- Pupa cylindrica var. Longa Moquin-Tandon, 1856
- Pupa cylindrica var. Polyodon Moquin-Tandon, 1856
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. 138-142).
- Carl Marinus Steenberg: Etudes sur l'anatomie et la systématique des maillots (fam. Pupillidae, s. Lat.). Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i København, 80: 1–215, Copenhagen, 1925 (pp. 50–53, plate 6, fig. 1,2, plate 7, fig. 1,2)
- Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification = identification book for European land and freshwater mollusks. A1 – A3 p., 679 p., Q1 – Q78 p., Planet Poster Ed., Göttingen 2012, ISBN 978-3-933922-75-5 .
Individual evidence
- ^ André Louis Gaspard Michaud: Description de plusieurs espèces nouvelles de coquilles vivantes. Bulletin d'Histoire Naturelle de la Société Linnéenne de Bordeaux, 3: 260-276, Bordeaux 1829 Online atibiodiversitylibrary.org p.268-270 and Fig.17,18
- ↑ Carl Agardh Westerlund: Fauna of the inland Conchylia living in the Palearctic region (Europe, Caucasia, Siberia, Turan, Persia, Kurdistan, Armenia, Mesopotamia, Asia Minor, Syria, Arabia, Egypt, Tripoli, Tunisia, Algeria and Morocco). III. Gene. Buliminus, Sesteria, Pupa, Stenogyra & Cionella. Pp. 1–183, 1–15, 1–26, Lund, Håkan Ohlsson, 1887 Online at www.biodiversitylibrary.org (p. 78).
- ^ Fauna Europaea: Abida cylindrica (Michaud 1829) on faunaeur.org
- ↑ Gargominy, O. & Gomez, B. 2011. Abida cylindrica. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. on iucnredlist.org, accessed September 14, 2013.
