Planorbella trivolvis

Planorbella trivolvis is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral or left-coiling shells.

Planorbella trivolvis
Two specimen of Planorbella trivolvis in their natural environment, on aquatic vegetation
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Planorbella
Species:	P. trivolvis
Binomial name
Planorbella trivolvis (Say, 1817)
Synonyms
Helisoma trivolvis (Say, 1817) Planorbis trivolvis Say, 1817 (original combination)

Description

All species within family Planorbidae have sinistral shells. The width of the shell of this species is up to 18 mm.

Distribution

This pond snail is native to North America, from the Arctic areas of Canada all the way south to Florida. It has also been introduced in other parts of the world.

• Peru^[1]
• Dominica^[2]

Habitat

This species prefers habitats with floating water weeds.

Parasites

• Planorbella trivolvis is an intermediate host for Echinostoma trivolvis.^[3]