Planorbella duryi, common name the Seminole rams-horn, is a species of air-breathing freshwater snail, a pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. The species is endemic to Florida and is found frequently in home aquariums.

Quick Facts Scientific classification, Binomial name ...

Planorbella duryi Temporal range: PreꞒ Ꞓ O S D C P T J K Pg N ↓ Piacenzian - recent
A live Planorbella duryi individual
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Planorbella
Species:	P. duryi
Binomial name
Planorbella duryi (Wetherby, 1879)
Synonyms
Planorbis (Helisoma) duryi Wetherby, 1879 Helisoma duryi (Wetherby, 1879)

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In the wild they are brown.^[1] In captivity they have been bred to come in many colours. These colours are:

• Brown
• Brown leopard
• Blue
• Blue leopard
• Red/orange
• Pink
• Green
• Purple^[2]

This species of snail is endemic to the freshwater ecosystems of the US state of Florida.^[3] Fossils of the species have been found dating back to the Piacenzian, in the Tamiami formation.

It has been introduced to Hawaii and lives in the wild there.^[4] It is an introduced species in various European islands and countries including:^[5]

• Great Britain as a "hothouse alien"^{[citation needed]}
• Hungary^{[citation needed]}
• Ireland as a "hothouse alien"^{[citation needed]}
• Parts of Southern Nigeria [e.g Ogun State, Lagos, Oyo]^{[citation needed]}
• Palestine, first discovered in the pond at the Palestine Museum of Natural History^[6]
• Poland^{[citation needed]}

They are found in most freshwater habitats including streams and ponds.^[7]

This species is listed by natureserve as G5.^[8]

They eat dead or decaying plants or fish, and algae.^[9]

They are hermaphrodites. They lay eggs and are very fast breeders.^[10]

They are a very common aquarium snail. Eggs can get into aquariums on plants. Some people consider them pests due to their ability to breed very fast and overpopulate. Other people value them as part of their clean up crew.^[11]