Granaria frumentum
Beaded grain auger ( Granaria frumentum )
The Beaded grain auger ( Granaria frumentum ) is a terrestrial snail from the family of the grain auger ( Chondrinidae ).
Features
The housing is 6.5 to 8 mm high and measures 2.7 to 3 mm in thickness ( width). The height-width index is variable, so that smaller (lower ) specimens at relatively greater thickness are stockier. The housing is hochkonisch, takes the upper third rapidly towards the apex, d take the first five to six, flat rounded turns much faster in width than the last turns. Nine to ten turns are formed, which are separated by a relatively flat seams. The shell is translucent and brownish to gray. The surface is largely smooth and has only fine, dense and regular growth lines on. On the final approach to a strong, white neck ridge, which narrows the navel field forms. The mouth edge is folded over and greatly enlarged. He is interrupted in the region of the parietal region. The opening is narrowed by the neck ridge and palate or fold it stand eight teeth (or folds) inside. The four Palatalzähne are always well developed and merge, more the other four teeth with the Gaumenschwiele. The teeth show through the housing and form strokes that extend over about half a turn, so until the beginning of the formation of teeth in the mouth. The Angularzahn communicates with the aperture rim in combination, the Parietalzahn and the two Columellarzähne close together.
Geographic occurrence and habitat
The Beaded grain auger is widespread in Central Europe, but very scattered. It occurs only in areas with calcareous or dolomitic ground. The incidence ranges from eastern and southeastern France, via Switzerland, South and Central Germany ( to southern Lower Saxony ( resin ) ), Austria, Czech Republic, Slovakia, Hungary ( Bükk ) and the Balkan Peninsula to Bulgaria, also isolated in small deposits ( procrastination? ) in northern France, Belgium, Northern Germany and south-eastern Poland.
The species prefers xerotherm, kurzrasige slopes at the foot of rocks, walls, scree slopes, and meadows on calcareous sites, rarely also on other rocks.
Way of life
At or after rain, the animals crawling on stones and rocks, but also in roots, at the foot of bushes, or grass stems. In the dry, they hide under stones, between boulders or in crevices. They overwinter in rock sites under dead vegetation.
In grassy biotopes Beaded grain auger acts sometimes as an intermediate host of the liver fluke little ones, especially if other intermediate hosts (eg Helicella itala or Xerolenta obvia ) are missing. Due to their rarity and their habitat, it plays no major role as a vector for Dicrocoeliose.
System
The Beaded grain auger is the type species of the genus Granaria Held, 1838. It was in 1801 by Jacques Philippe Raymond Draparnaud as Pupa frumentum first described scientifically. The species name is interpreted as a noun in Aposition; the ending is therefore not adapted to the gender of the genus. There are excreted five subspecies:
- Granaria frumentum appenina ( Küster, 1850)
- Granaria frumentum atracta ( Pilsbry 1918)
- Granaria frumentum frumentum ( Draparnaud 1801), the Nominatunterart
- Granaria frumentum hungarica ( Kimakowicz 1890)
- Granaria frumentum subaii Fehér, Deli & Solymos, 2010