Planorbis planorbis

Planorbis planorbis is a species of air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails.^[3]

Planorbis planorbis
A shell of Planorbis planorbis
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Planorbis
Species:	P. planorbis
Binomial name
Planorbis planorbis (Linnaeus, 1758)[2]
Synonyms[3]
† Planorbis (Anisus) umbilicatus (Müller, 1773) † Planorbis planorbis planorbis (Linnaeus, 1758) (no subspecies for P. planorbis) Planorbis umbilicatus (Müller, 1773)

Distribution

• Cosmopolitan - introduced and being considered invasive to many places and considered as a pest
• Czech Republic^[4] - least concern (LC)^[5]
• Slovakia^[4]
• Germany - not listed in red list
• the Netherlands^[6]
• Poland
• Great Britain
• Ireland
• Hungary

Description

Drawing of the shell of Planorbis planorbis.
Upper image: Lateral view showing the profile of the shell.
Lower image: Umbilical view; this side is carried uppermost in the living snail.

This species, like all planorbids, has a sinistral shell. The width of the shell is 15 – 20 mm. The keel on the periphery of the shell is near the edge closest to the spire side, which is carried downwards in life.

Ecology

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.