Aphaostracon

Aphaostracon is a genus of very small or minute freshwater snails in the family Cochliopidae that have an operculum.^[1]

Aphaostracon
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Cochliopidae
Genus:	Aphaostracon F. G. Thompson, 1968
Type species
*Aphaostracon rhadinus F. G. Thompson, 1968

Aphaostracon species are endemic to restricted areas in Florida, often to a single spring or spring run.^[2]

Species

This genus includes the following species:^[3][4] }

Species

Species	Common Name	Range
Aphaostracon asthenes (F. G. Thompson, 1968)	Blue Spring hydrobe	Blue Spring[2]
Aphaostracon chalarogyrum (F. G. Thompson, 1968)	freemouth hydrobe	Magnesia Springs in (Alachua County)[2]
Aphaostracon hypohyalinum (F. G. Thompson, 1968) (Syn: A. hypohyalina)	Suwannee hydrobe	Suwannee, Santa Fe, and Waccasassa rivers[2]
Aphaostracon monas (Pilsbry, 1899)	Wekiwa hydrobe	Wekiwa Springs
Aphaostracon pachynotum (F. G. Thompson, 1968) (Syn: A. pachynotum)	thick-shelled hydrobe	upper half of St. Johns River[5]
Aphaostracon pycnum (F. G. Thompson, 1968)	dense hydrobe	Alexander Springs,[2] Silver Glen Springs[6]
Aphaostracon rhadinum (F. G. Thompson, 1968)	slough hydrobe	tributaries of lower St. Johns River[2]
Aphaostracon theiocrenetum (F. G. Thompson, 1968) (Syn: A. theiocrenetum)	Clifton Spring hydrobe	Clifton Springs[2]
Aphaostracon xynoelictum (F. G. Thompson, 1968)	Fenney Spring hydrobe	Fenney Spring, in Sumter County

One or more additional Aphaostracon species have been reported from springs in Florida, including Bugg Spring, De Leon Springs, and Green Springs. The snails from the three springs have not described in an authoritative publication, and it is not known if they belong to one, two, or three species.^[7]

References

1. Bouchet, P. (2014). Aphaostracon F. G. Thompson, 1968. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php/aphia.php?p=taxdetails&id=729790 on 2014-11-16
2. Burgess, George H.; Franz, Richard (1978). "Zoogeography of the Aquatic Fauna of the St. Johns River System with Comments on Adjacent Peninsular Faunas". The American Midland Naturalist. 100 (1): 160–170. doi:10.2307/2424786. ISSN 0003-0031. JSTOR 2424786.
3. Group, U. S. Geological Survey Karst Interest (2001). U.S. Geological Survey Karst Interest Group Proceedings, St. Petersburg, Florida, February 13-16, 2001. U.S. Department of the Interior, U.S. Geological Survey. p. 81. {{cite book}}: |last= has generic name (help)
4. "Molluscabase - Aphaostracon F. G. Thompson, 1968". molluscabase.org. Retrieved 2023-06-16.
5. Johnson, Richard I. (June 29, 1973). "Distribution of Hydrobiidae, a Family of Fresh and Brackish Water Gastropods, in Peninsular Florida". Occasional Papers on Mollusks (Harvard University). 3 (46): 301 – via Smithsonian Institution Biodiversity Heritage Library.
6. Mattson, Robert A. (2011). "Chapter 11. Benthic Macroinvertebrates, Appendix 11. A Description of Benthic Communities in the St Johns River Mainstream" (PDF). St Johns River Water Management District. Retrieved June 11, 2023.
7. Shelton, Douglas N. (September 2005). The Rare and Endemic Snails of Selected Springs Within the St. Johns River Water Management District (Report). St. Johns River Water Management District. pp. 5–6.

• Hershler R. & Thompson F.G. (1992) A review of the aquatic gastropod subfamily Cochliopinae (Prosobranchia: Hydrobiidae). Malacological Review suppl. 5: 1-140.

Further reading

• Hershler, Robert; Holsinger, Joen R. (1990). "Zoogeography of North American hydrobiid cavesnails" (PDF). Stygologia. 5 (1): 5–16 – via Smithsonian Institution Repository.