Planorbella trivolvis

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 trivolvisSay, 1817 (original combination)

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.

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. Recent genetic analysis of western U.S. populations of Planorbella trivolvis found that most genetic variation occurs within and among local populations rather than between watersheds, and that geographic distance did not predict genetic distance — a pattern attributed to long-distance dispersal by migratory waterfowl. ^[1]

• Peru ^[2]
• Dominica ^[3]

Habitat

This species prefers habitats with floating water weeds.

Parasites

• Planorbella trivolvis is an intermediate host for Echinostoma trivolvis. ^[4]

References

1. Martin KR, Johnson PTJ, Bowerman J, & Li J (2020). Biogeography of the freshwater gastropod Planorbella trivolvis (Gastropoda: Planorbidae) in the western United States. PLoS ONE, 15(7): e0235989. https://doi.org/10.1371/journal.pone.0235989
2. Paraense W. L. (September 2003) "Planorbidae, Lymnaeidae and Physidae of Peru (Mollusca: Basommatophora)". Memórias do Instituto Oswaldo Cruz98(6): 767-771. PDF
3. Reeves W. K., Dillon Jr. R. T. & Dasch G. A. (2008). "Freshwater snails (Mollusca: Gastropoda) from the Commonwealth of Dominica with a discussion of their roles in the transmission of parasites". American Malacological Bulletin24: 59-63. doi : 10.4003/0740-2783-24.1.59. PDF Archived 2010-01-07 at the Wayback Machine .
4. "Maintenance of the life cycle of Echinostoma trivolvis (Trematoda) in dexamethasone-treated ICR mice and laboratory-raised Helisoma trivolvis (Gastropoda)". doi : 10.1007/s004360050200.

Further reading

• CYNTHIA G. NORTON & JENNIFER M. BRONSON (2006) "THE RELATIONSHIP OF BODY SIZE AND GROWTH TO EGG PRODUCTION IN THE HERMAPHRODITIC FRESHWATER SNAIL, HELISOMA TRIVOLVIS". Journal of Molluscan Studies72(2): 143-147. doi : 10.1093/mollus/eyi057
• Norton C. G., Johnson A. F. & Mueller R. L. (2008) "Relative size influences gender role in the freshwater hermaphroditic snail, Helisoma trivolvis". Behavioral Ecology19(6): 1122-1127. doi : 10.1093/beheco/arn099
• Johnson, P. D.; Bogan, A. E.; Brown, K. M.; Burkhead, N. M.; Cordeiro, J. R.; Garner, J. T.; Hartfield, P. D.; Lepitzki, D. A. W.; Mackie, G. L.; ; Tarpley, T. A.; Tiemann, J. S.; Whelan, N. V.; Strong, E. E. (2013). Conservation status of freshwater gastropods. of Canada and the United States. Fisheries. 38(6): 247-282