Leonia jolyi
| Leonia jolyi | ||||||||||||
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Leonia jolyi |
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| Scientific name | ||||||||||||
| Leonia jolyi | ||||||||||||
| Pallary , 1908 |
Leonia jolyi is a living on the land snails - kind from the family of pomatiidae (Pomatiidae) in the order of sorbeoconcha . The species is named after its finder Alexandre Joly , then a professor in Constantine (Algeria).
features
The tightly clad housings show a clear sexual dimorphism. The housings of the females are on average significantly larger; they measure 22.5 to 27.3 mm in height and 12.4 to 14.3 mm in width. The housings of the males measure 18.4 to 21.4 mm in height and 10.5 to 12 mm in width. They are slim-conical with 6 to 6.5 well arched turns. The seam is clear, but not very deep. The last turn takes up about half of the total height. The protoconch is smooth and whitish-yellowish. A clearly marked line that is colored dark purple runs under the seam. The housing is otherwise whitish to pink in color, with flame-like structures that are more intensely colored. On the first postembryonic turn there may be purple spots under the suture, continuing the infrasutural line. The ornamentation consists of little protruding radial and spiral ribs that create a reticulate pattern. The spiral ribs are interrupted by the radial ribs. The mouth is egg-shaped with an angled top. It takes up more than a third of the total housing height. The inside of the mouth is orange. The edge of the mouth is not interrupted, whitish and strongly thickened. It is bent back and placed on the last turn in the spindle area. The navel is narrow and completely covered. The operculum is calcified and sits roughly in the middle of the foot. It is pulled a little bit into the mouth when the animal withdraws into the housing. The front is convex with an eccentric nucleus . The nucleus is partially covered. The outer layer has many folds perpendicular to the edge.
In the male, the sex glands are located in the uppermost coils, surrounded by the digestive gland. The sex gland consists of numerous tubular structures that eventually converge in the spermatic duct. The spermatic duct is comparatively thick, very long and very twisted before it opens into the prostate. This gland is bent in a spindle shape. The executive leader is thin and very short. The U-shaped bent penis consists of two sections, the proximal part of approximately equal thickness up to the bend and the distal part. The first section from the bend decreases slightly in thickness and then swells up considerably. The tip is very short. Overall, the distal part is only slightly longer than the proximal part.
The female sex glands are also located in the uppermost coils. They consist of a simple, whitish, tubular structure embedded in the digestive gland. The fallopian tube is long, very thin and not very tortuous. It flows into the sperm library, which is comparatively large and spherical. The spermatheque sits on the much larger albumin gland, to which the capsular gland connects to the mantle cavity.
The radula consists of seven elements ("teeth") per transverse row, a central tooth, two lateral teeth (posterior tooth) and a marginal tooth (peripheral tooth). The central tooth is large and triangular. It has 5 to 7 denticles. The first lateral tooth is also triangular and has 5 to 6 denticles. The second lateral tooth is rectangular with 4 to 5 denticles. The marginal tooth is quite large (wide) and more or less rectangular. It has two groups of denticles: an outer group and an inner group. The outer group has 9 to 13 denticles, the inner group 5 denticles.
The body is uniformly whitish. The foot is divided into two zones by a longitudinal furrow.
Similar species
Leonia jolyi is very similar to Leonia mammillaris , but its housing is significantly smaller and slightly less slender. In Leonia mammillaris , the distal part of the penis is more than twice as long as the proximal part. In Leonia jolyi , the thickness initially decreases in the distal part and then swells in a spherical shape. The tip is very short. In Leonia mammillaris the tip is very long. In the female genital tract, the spermathec of Leonia mammillaris is significantly smaller compared to the spherical and significantly larger spermathec of Leonia jolyi . Differences between the two species can also be observed in the construction of the radula. While the differences in individual cases are not sufficient to reliably identify the species, the average values of the denticles of the individual teeth differ e.g. Sometimes significant.
Geographical distribution
The species is so far only known from a small area in the Beni Snassen Mountains in northeastern Morocco ( Rif Mountains ).
Taxonomy
The taxon was first described by Paul Pallary in 1908. Prof. MA Joly had collected the specimens in the Beni Snassen Mountains (Rif Mountains). He later described the boiteli variety from Bou Rdim between El Aïoun and Taforalt ( Oujda-Angad Prefecture , Morocco). Francis Llabador also described the major , minor , minor fusca , carinara and fasciata varieties from the vicinity of Berkane , also in the Oujda-Angad prefecture (Morocco).
supporting documents
literature
- Emil Adolf Roßäßler (with the collaboration of F. Haas, Paul Hesse, Wilhelm Kobelt, Hermann Rolle, JA Wagner): Iconography of the land and freshwater mollusks with special consideration of the European species not yet shown. Neue Serie, 15: 1–84, 30 plates, Wiesbaden, CW Kreidler's Verlag 1910 Online at www.biodiversitylibrary.org (p. 29, plate 406, fig. 2329-2331)
- María Rosario Alonso, Miguel Ibañez: Estudio anatomico y comparativo de Leonia mamillaris (Lamarck, 1822) y Leonia jolyi (Pallary, 1908) (Prosobranchia: Pomatiasidae). Lavori della Società Malacologica Italiana, 17-18: 253-268, 1981.
Individual evidence
- ^ Paul Pallary: Notes on the Cyclostomes du Nord-Ouest de l'Afrique. La Feuille des jeunes naturalistes, 4th série, 39 (458): 41–44, Paris 1908 Online at www.biodiversitylibrary.org (p. 43/4).
- ↑ Paul Pallary: Complément à la faune malacologique de la Berbérie. Journal de Conchyliologie, 71: 197-277, 1927.
- ^ Francis Llabador: Révision des Cyclostomes de la Berbérie. Bulletin de la Société d'Histoire Naturelle de l'Afrique du Nord, 29: 282-297 (online at Biblioteca Digital Real Jardín Botánico CSIC PDF ) (p. 296)