Odontocyclas kokeilii

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Odontocyclas kokeilii
Odontocyclas kokeilii

Odontocyclas kokeilii

Subordination : Land snails (Stylommatophora)
Superfamily : Pupilloidea
Family : Barrel snails (Orculidae)
Subfamily : Odontocycladinae
Genre : Odontocyclas
Type : Odontocyclas kokeilii
Scientific name of the  genus
Schlueter , 1838
Scientific name of the  species
Odontocyclas kokeilii
( Rossmässler , 1837)

Odontocyclas kokeilii uncommon, even Smooth Zahnkreistönnchen or face gear worm called, is a snail from the family of orculidae (Orculidae) that the subordination of terrestrial snails is expected (gastropod). It is the only species in the genus Odontocyclas Schlueter , 1838.


The small, conical housing has 7 to 8 slightly curved, slowly increasing turns, which are separated from each other by a comparatively deep seam. It becomes 3 to 4 mm high and 2.4 to 2.5 mm wide. The embryonic convolutions are very finely grained, the following convolutions show weak, but sharp, inclined growth strips. The shell is horn-colored, gray-yellow to light brown, moderately thin and slightly translucent, the surface shiny. However, the housings are usually covered with clay or excrement for camouflage. The last turn rises towards the mouth. The mouth is rounded to ovoid. The edge of the mouth is almost continuous, turned over and provided with a weak, whitish lip on the inside. Numerous teeth protrude into the mouth. The parietal wall (neck area) shows two large teeth and usually an angularis and a short subangularis. Four teeth are formed in the palate area ("palatal"). Further teeth and lamellae can be formed in between. The teeth are confined to the front edge of the mouth. The juvenile stages have not yet formed any teeth in the mouth. The navel is open.

The soft body is light blue-gray, the case is worn very upright. In the genital apparatus, the spermatic duct enters the epiphallus apically. Before the epiphallus enters the penis, it narrows. The epiphallus is at least twice as long as the penis. A very long blind sac (caecum or flagellum) attaches to the penis and is about twice as long as the penis itself. The penile retractor muscle inserts at the junction between the penis and the epiphallus. However, there is no penile appendix. The vagina is shorter than the free fallopian tube. The spermathec has a long stem. The bladder itself is small and rounded. A long diverticulum branches off just below the bladder .

The radula has 17 to 19 posterior teeth in a semi-transverse row next to the three-pointed central tooth, which initially have a main tooth and a secondary tip. From the 7th tooth, seen from the center, the secondary tip divides further.

Similar species

The species (and genus) hardly differs in the housing from Walklea rossmaessleri . It's a little smaller, the last turn isn't quite as prominent and the outline is a little straighter. The case has an open umbilicus and the clear radial sculpture is missing.

However, it differs significantly in the sexual apparatus. In Walklea rossmaessleri the penile appendix is ​​conspicuous and much longer. In addition, a flagellum is formed, which is missing in Odontocyclas kokeilii . On the other hand, the epiphallus of this type is significantly longer in relation to the penis. In addition, a long diverticulum is formed on the stem of the spermathec.

Geographical distribution and habitat

The distribution area of ​​the species (and genus) extends from south- east Austria and north-east Italy via Slovenia , Croatia to Bosnia and Herzegovina .

It lives in damp, shady locations, under moss and leaves, on walls and rocks and is limited to chalky soils.


The taxon was first described in 1837 by Emil Adolf Roßmaessler under the original binomial Pupa kokeilii . The species name honors the scientist Friedrich Kokeil (1802-1865). The genre was established in 1838 by Friedrich Schlueter . Type species is Pupa kokeilii by monotype. The taxon Pupa rossmaessleri (Rossmässler, 1838), which used to belong to the genus Odontocyclas , is now the type species of the genus Walklea Gittenberger, 1978. A more recent synonym is Pupa kokeilii forma mitescens Westerlund, 1887.


The species is classified as not endangered by the International Union for Conservation of Nature and Natural Resources (IUCN).

supporting documents


  • Michael P. Kerney, Robert AD Cameron & Jürgen H. Jungbluth: The land snails of Northern and Central Europe. 384 p., Paul Parey, Hamburg & Berlin 1983 ISBN 3-490-17918-8 (p. 98/99)
  • Edmund Gittenberger: Contributions to the knowledge of the Pupillacea VIII. Some about Orculidae. Zoologische Verhandelingen, 163: 3-44, 1978 PDF
  • Bernhard Hausdorf: The Orculidae of Asia (Gastropoda: Stylommatophora). Archive for Molluscology, 125 (1/2): 1-86, Frankfurt / M. 1996.
  • Anatolij A. Schileyko: Treatise on Recent terrestrial pulmonate molluscs, Part 1. Achatinellidae, Amastridae, Orculidae, Strobilopsidae, Spelaeodiscidae, Valloniidae, Cochlicopidae, Pupillidae, Chondrinidae, Pyramidulidae . Ruthenica, Supplement 2 (1): 1-126, Moscow 1998 ISSN  0136-0027


Individual evidence

  1. ^ Rosina Fechter, Gerhard Falkner: Molluscs. 287 p., Mosaik-Verlag, Munich 1990 (Steinbach's Nature Guide 10) ISBN 3-570-03414-3 (p. 146)
  2. ^ Paul Mildner, Ursula Rathmayer: Red list of the molluscs of Carinthia (Mollusca). In: WE Holzinger, Paul Mildner, T. Rottenburg, C. Wieser (eds.): Red lists of endangered animals in Carinthia. Nature conservation in Carinthia, 15: 643 - 662, Klagenfurt 1999 PDF (p. 648)
  3. ^ Emil Adolf Rossmässler: Iconography of the land and freshwater molluscs, with special consideration of the European species not yet shown. First volume. Issue 1: I-VI, 1-132, Issue 2: 1-26, Issue 3: 1-33, Issue 4: 1-27, Issue 5-6: 1-70, Taf. 1-30, Dresden, Leipzig , Arnoldische Buchhandlung, 1835-1837. Online at www.biodiversitylibrary.org (Issue 5-6, pp. 18/9) [Online at www.biodiversitylibrary.org Online at www.biodiversitylibrary.org] (Plate 23 Fig. 335)
  4. ^ Austrian Biographical Lexicon 1815-1950: Friedrich Kokeil
  5. ^ Friedrich Schlueter :. Brief systematic index of my conchylia collection with an indication of all land and river conchylia that I have found near Halle so far. Compiled to facilitate the exchange for friends of conchyliology. P. I-VII, 1-40, Halle, Gebauer, 1838.
  6. 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. 120)
  7. Odontocyclas kokeilii in the IUCN Red List of Threatened Species 2013.2. Posted by: Feher, Z., 2010. Retrieved March 14, 2014.

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