Biology:Laevapex
| Laevapex | |
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| Subfamily: | Planorbinae
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| Genus: | Laevapex Walker 1903[1]
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| Type species | |
| Ancylus fuscus C. B. Adams, 1841
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| Species | |
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Laevapex is a genus of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails and their allies.[2]
Geographic distribution
The genus has a New World distribution. It is widespread throughout the eastern United States, occurring in lakes and slow-flowing rivers.[3]
Anatomy
These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill when they are unable to reach the surface for air.[3]
Members of this genus are characterised by their smooth apex.[3]
Species
Species within the genus Laevapex include:[1][2][4]
- Laevapex diaphanus Haldeman, 1841
- Laevapex fuscus C. B. Adams, 1841
- Laevapex peninsulae Pilsbry, 1903
- Laevapex vazi Santos, 1989
Walther (2008) considers North American Laevapex monotypic, collectively synonymising L. diaphanus, L. peninsulae and unidentified Laevapex sp. with L. fuscus, the type species.[3]
References
- ↑ 1.0 1.1 "Laevapex Walker, 1903". Integrated Taxonomic Information System. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=76576.
- ↑ 2.0 2.1 Roskov Y.; Kunze T.; Orrell T. et al., eds. "Laevapex". Species 2000 & ITIS Catalogue of Life, 2014 Annual Checklist. Species 2000: Naturalis, Leiden, the Netherlands. http://www.catalogueoflife.org/col/search/all/key/laevapex/match/1.
- ↑ 3.0 3.1 3.2 3.3 Walther, A. C. (2008). "E Pluribus Unum: A Phylogenetic and Phylogeographic Reassessment of Laevapex (Pulmonata: Ancylidae), a North American Genus of Freshwater Limpets". A systematic study of North American freshwater limpets (Gastropoda: Hygrophila: Ancylidae) (PDF) (Ph.D. thesis). The University of Michigan.
- ↑ dos Santos; S. B. (2003). "Estado atual do conhecimento dos ancilídeos na América do Sul (Mollusca: Gastropoda: Pulmonata: Basommatophora)" (in pt) (PDF). Revista de Biología Tropical 51 (3): 191–223. http://www.redalyc.org/pdf/449/44911879011.pdf. Retrieved 29 June 2014.
External links
"Laevapex: Pictures". The Animal Diversity Web - University of Michigan. http://animaldiversity.ummz.umich.edu/accounts/Laevapex/pictures/.
Wikidata ☰ Q3698348 entry
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