Planorbella duryi

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.

Planorbella duryi
Temporal range: Piacenzian - recent
A live Planorbella duryi individual
Scientific classification Edit this 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)


Description
Apical and apertural view of a shell of Planorbella duryi. Scale bar is 10 mm.

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]

Distribution
Fossilized Planorbella duryi eroding out of the Tamiami formation, in Florida

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"
  • Ireland as a "hothouse alien"
  • Poland
  • Hungary
  • Parts of Southern Nigeria [e.g Ogun State, Lagos, Oyo]

Habitat

They are found in most freshwater habitats including streams and ponds.[6]

Conservation status

This species is listed by natureserve as G5.[7]

Diet

They eat dead or decaying plants or fish, and algae.[8]

Breeding

They are hermaphrodites. They lay eggs and are very fast breeders.[9]

Human use

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.[10]

References
  1. "PLANORBIDAE, Helisoma duryi | Conchology". conchology.be.
  2. "Ramshorn Snail: Care, Colors & Info (+ Why You Need Them)". pure gold fish.
  3. "AnimalBase :: Helisoma duryi species homepage". animalbase.
  4. "Planorbella duryi". hbs.bishopmuseum.
  5. "AnimalBase :: Helisoma duryi species homepage". animalbase.
  6. "Planorbella duryi". hbs.bishopmuseum.
  7. "Planorbella duryi | NatureServe Explorer 2.0". natureserve Explorer.
  8. "Ramshorn Snails - Detailed Guide: Care, Diet and Breeding". aquarium breeder.
  9. "Ramshorn Snail Care, Size, Food, Reproduction, Lifespan - Video". aquarium care basics.
  10. "Ramshorn Snail Guide | Removal & Information". Aquarium info.
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