Leucomastus

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Leucomastus
Leucomastus varnensis

Leucomastus varnensis

Systematics
Subordination : Land snails (Stylommatophora)
Superfamily : Enoidea
Family : Wolverine snails (Enidae)
Subfamily : Eninae
Tribe : Chondrulini
Genre : Leucomastus
Scientific name
Leucomastus
Wagner , 1928

Leucomastus is a genus of the family of wolverine snails (Enidae) from the subordination of land snails (Stylommatophora).

features

The oblong-cylindrical to egg-shaped cases are 19 to 30 mm high and 6 to 11 mm wide. They have eight to nine turns that are moderately convex at the periphery. The last turn does not rise, or only very slightly, towards the mouth. The mouth is crooked U-shaped. The mouth edge is curved outwards. It is not thickened and runs sharply. The mouth has no teeth / lamellae or a parietal callus . The housings are yellowish to whitish in color and some show light to dark brown stripes. The surface of the embryonic convolutions is smooth, the surface of the postembryonic convolutions is ornamented with faint radial folds.

In the male tract of the sexual apparatus, a short, conical flagellum is formed at the entry of the very long vas deferens into the very long epiphallus. The initial part of the epiphallus is helically wound. A short, conical blind sac (epiphallus caecum) is developed approximately in the middle, based on the length of the epiphallus. The epiphallus is about three to four times as long as the penis, but has a smaller diameter. The penile appendix opens separately into the atrium. It is very long, longer than the combined epiphallus / penis length. A penile caecum is not developed. The penile appendix has a very thick lower part, a short spherical part, a very long and thin, several times swollen middle part and a long, elongated club-shaped end part. The retractor muscle divides into two strands, one of which attaches to the epiphallus, near the epiphallus flagellum, and the other to the penis, between the middle of the penis and the transition from the penis to the epiphallus. The free fallopian tube is longer than the vagina. The spermatheque is comparatively very short, the bladder comes to rest at the lower end of the prostate. A long, thin diverticulum branches off from the stalk of the spermathec.

Similar genera

The genus Zebrina essentially only differs in the anatomy of the genital apparatus. One of the two strands of the penile retractor muscle does not attach to the epiphallus, near the epiphallus flagellum, as in the genus Leucomastus , but to the end of the lower thick part of the penile appendix. As with Leucomastus, the other strand of the retractor muscle attaches to the penis, between the middle and the transition between the epiphallus and penis.

Geographical distribution

The distribution area of ​​the genus extends from Southeastern Europe (Romania, Bulgaria, European part of Turkey) to the Asian part of Turkey. Leucomastus varnensis was introduced to Thuringia and has established itself there.

Taxonomy

The genre was established in 1928 by Antoni Józef Wagner. Type species through monotype is Leucomastus bureši Wagner, 1928, a more recent synonym of Leucomastus kindermanni (Pfeiffer, 1853). Leucomastus is still treated by Schileyko (1998) and Fauna Europaea as a younger synonym of Zebrina . In contrast, Welter-Schultes and Gümüş & Neubert consider Leucomastus to be an independent genus.

supporting documents

literature

  • Burçin Aşkım Gümüş, Eike Neubert: New taxa of terrestrial molluscs from Turkey (Gastropoda, Pristilomatidae, Enidae, Hygromiidae, Helicidae). ZooKeys, 171, pages 17-37, 2012 doi : 10.3897 / zookeys.171.2273
  • Anatolij A. Schileyko: Treatise on Recent Terrestrial Pulmonate Molluscs. Part 2. Gastrocoptidae, Hypselostomatidae, Vertiginidae, Truncatellinidae, Pachnodidae, Enidae, Sagdidae. Ruthenica, Supplement 2 (2), pages 129-261, Moscow 1998 ISSN  0136-0027
  • Francisco W. Welter-Schultes: European non-marine molluscs, a guide for species identification. Identification book for European land and freshwater mollusks. Planet Poster Ed., Göttingen 2012, p. 184 ISBN 3-933922-75-5 , ISBN 978-3-933922-75-5

Individual evidence

  1. ^ Vollrath Wiese: The land snails of Germany. 352 pp., Quelle & Meyer, Wiebelsheim 2014 ISBN 978-3-494-01551-4
  2. ↑ Antoni Józef Wagner: Studies on the mollusc fauna of the Balkan Peninsula with special consideration of Bulgaria and Thrace, together with monographic treatment of individual groups. Prace Zoologiczne Polskiego Panstwowego Muzeum Przyrodniczego [Annales Zoologici Musei Polonici Historiae Naturalis] 6 (4) ["1927"]: 263-399, plates 10-23. Warsaw 1828.
  3. ↑ Fauna Europaea (the type species of Leucomastus is listed there under the genus Zebrina .)

On-line

Web links

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