Planorbis planorbis (Dwarf Flat Ramshorn Snail)

August 9, 2017 killifish 0

Planorbis planorbis is a species of air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram’s horn snails. This species is widely distributed across the Palearctic region, and is found south of Oslo in Norway and across Europe to parts of North Africa; it is also found as far east as Lake Baikal, Russia. The habitat of this species is shallow standing and slowly running freshwaters on a mud substrate, also ponds and temporarily drying flood waters, up to 1 metre depth. Planorbis planorbis does not tolerate intensive water movements but is tolerant to eutrophic conditions.

This species, like all planorbids, has a sinistral shell. The width of the shell is 10 – 20 mm, height 2.5 – 4 mm. The keel on the periphery of the shell is near the edge closest to the spire side, which is carried downwards in life. A rather thick and strong shell. It is not glossy and it has a paler keel to