Lehmannia

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Lehmannia
Tree snail (Lehmannia marginata)

Tree snail ( Lehmannia marginata )

Systematics
Order : Lung snails (pulmonata)
Subordination : Land snails (Stylommatophora)
Superfamily : Limacoidea
Family : Schnegel (Limacidae)
Subfamily : Limacinae
Genre : Lehmannia
Scientific name
Lehmannia
Heynemann , 1863

Lehmannia is a genus of the nudibranch family of the Schnegel (Limacidae) from the suborder of the land snails (Stylommatophora).

features

The species in this genus are medium-sized animals with a conspicuously slender body. The rear end is pointed. When contracted, they reach a length of about 4 cm, stretched out to about 8 cm. The skin is very soft, thin and slightly translucent. It looks watery and is very slippery to the touch. The keel is of different lengths and slightly convex. It doesn't go to the coat. As an extension of the keel, however, a light stripe often extends to the edge of the coat. The coat reaches about a third of the total body length. It has fine concentric wrinkles. The breathing hole (pneumostome) lies behind the middle of the mantle shield. The coloring is very variable, often also within a species. On the other hand, anatomically well distinguishable species can be colored very similarly. In many species, the drawing consists of washed-out longitudinal stripes or welts. The slime is colorless and watery to the touch; if specimens are irritated, they can secrete large amounts of mucus.

The bowel is not twisted; he shows three loops. The second loop is shorter than the first loop and the third loop is shorter than the second loop. There is an appendix. The sex gland sits behind the second loop of intestine or within the first loop of intestine. The distal part of the prostate is somewhat separated from the spermoviduct. The vas deferens is short and well developed and enters the penis subapically next to the penile retractor muscle. The penis is usually short, conical, inversely conical or club-shaped, rarely long and cylindrical. Internally, the penis has two longitudinal pilasters, but has no stimulus body. The penile retractor muscle attaches to the penis below the entrance to the spermatic duct (vas deferens). An unbranched flagellum is present in most species. It is a growth on the usually thickened end of the penis and can be short, plate-shaped or long, whip-shaped. The sperm library is short and opens into the penis near the base.

Geographical distribution, habitat and way of life

The species of the genus were originally limited to Europe in their distribution. Some are now spread almost worldwide through human displacement. Some are downright synanthropic , such as the greenhouse snail , whose name suggests this.

Most species are very active, sometimes crawling up trees or living mainly on trees. In the mountains, some species even go over the tree line, in the High Tatras z. B. at 2000 m. The species of the genus Lehmannia feed on algae, lichens, fungi and dead plant material, rarely also on fresh plant material.

Taxonomy

The taxon was proposed by David Friedrich Heynemann (also Friedrich David Heynemann) in 1863 in the 10th volume of the Malakozoologische Blätter for the first time as a subgenus of Limax . The type species is Limax marginatus Müller, 1774 by monotype. Currently, Lehmannia is generally understood as an independent genus. The following species are currently included in the genus Lehmannia :

supporting documents

literature

  • 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
  • Anatolij A. Schileyko: Treatise on Recent Terrestrial Pulmonate Molluscs Part 11 Trigonochlamydidae, Papillodermidae, Vitrinidae, Limacidae, Bielziidae, Agriolimacidae, Boettgerillidae, Camaenidae. Ruthenica, Supplement 2 (11): 1467-1626, Moscow 2003 ISSN  0136-0027
  • Andrzej Wiktor: The Polish Nudibranchs. 182 p., Monograph Fauny Polski, Polska Akademia Nauk Zakład Zoologii Systematycznej i Doświadczalnej, Warsaw & Kraków 1973.

Individual evidence

  1. ↑ Heynemann, David Friedrich (Friedrich David) 1863. Some communications on snail tongues with special attention to the genus Limax. - Malacoological sheets 10 ["1862"]: 200-216, plates II-III [= 2-3]. Cassel. [1]
  2. ↑ Fauna Europaea - genus Lehmannia
  3. ^ Wiktor (1973: pp. 85-88)
  4. ↑ Schileyko (2003: p. 1496)
  5. ^ AnimalBase - Lehmannia
  6. ↑ Kerney et al. (1983: p. 186ff.)

Web links

Commons : Lehmannia  - collection of images, videos and audio files