Vallonia whoops
| Vallonia whoops | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temporal occurrence | ||||||||||||
| Upper Oligocene to Miocene | ||||||||||||
| 28.1 to 15.97 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Vallonia whoops | ||||||||||||
| Gerber , 1996 |
Vallonia oops was a land-based snail subspecies from the grass snail family(Valloniidae). It attracted some attention, especially because of its unusual name.
features
The housings are medium-sized (2.3 to 2.6 mm wide, 1.1 to 1.4 mm high) and approximately disk-shaped, with a flat-conical thread that is clearly raised above the last handle. The Protoconch makes up about 1¼ of the total of about 3 1/3 whorls. The whorls increase slowly and evenly, and they are separated from each other by deep seams. They are well rounded and only slightly embrace each other. In cross-section, these are evenly rounded, and in the last quarter circumference they are short-egg-shaped and somewhat eccentric. The last passage runs horizontally in front of the mouth in profile, but mostly upwards slightly and downwards afterwards. The mouth is strongly sloping. It is much wider than it is high and often with lobed insertions drawn to the left. It then becomes ovoid and narrower proximally. The edges of the mouth on the previous turn are brought closer to one another and connected to one another by a strong callus. The mouth does not have an inwardly offset lip, at most a cuff, which can be slightly thickened. The edge of the mouth is short and curved outwards. The circumferences of the Teleoconch have numerous ribs, which follow each other regularly and closely and are somewhat narrower in the area of the mouth. The ribs are low, narrow and sharp and set off almost like a thread. In the space between the ribs there are usually two inconspicuous strips of growth.
Geographical distribution
Vallonia oops oops is known from the Upper Oligocene , the Chattium of the Mainz Basin, Hesse: Hochheim-Flörsheim near Wiesbaden, in Germany, as well as from the Lower Miocene , the Agenium of Montaigu-le-Blin in central France.
Similar species
Vallonia hoppla campactula is smaller and less voluminous in comparison and has only 2 7/8 to 3 1/8 whorls, of which 1 to 1 1/8 represent the embryonic housing. Its spread was near Frankfurt am Main . Vallonia oops is also similar to the recent species Vallonia mionecton mionecton . Vallonia mionecton mionecton , however, has a larger housing diameter with a flatter shape and an almost flat thread. The umbilicus is flatter, bowl-shaped and the convolutions only rise more strongly towards the mouth. It also has a denser ribbing.
Systematics and nomenclature
The species was first described in 1996 by Jochen Gerber as part of his revision of the genus Vallonia . The first description was based on collections made by Volker Fahlbusch and Gerhard Storch in 1980 at the type locality.
The species name is derived from the German “Oops!”, An exclamation of sudden astonishment. In the same text Gerber described other species with such unusual names, which, however, are only accessible to speakers of the German language.
literature
- Jochen Gerber: Revision of the genus "Vallonia" Risso 1826 (Mollusca: Gastropoda: Valloniidae). In: Writings on malacoology. 8, pp. 201–204 (in the following abbreviated to Gerber, revision with corresponding page number).
Individual evidence
- ^ Gerber: Revision of the genus "Vallonia" Risso 1826 (Mollusca: Gastropoda: Valloniidae). P. 202.
Web links
- Gürtler's collected grits In: Die Welt compact from September 19, 2011