Laevapex
| Laevapex | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila |
| Superfamily: | Planorboidea |
| Family: | Planorbidae |
| Subfamily: | Planorbinae |
| Tribe: | Ancylini |
| Genus: | Laevapex Walker 1903[1] |
| Type species | |
| Ancylus fuscus C. B. Adams, 1841 | |
| Species | |
|
See text | |
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 2 "Laevapex Walker, 1903". Integrated Taxonomic Information System. Retrieved 29 June 2014.
- 1 2 Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (eds.). "Laevapex". Species 2000 & ITIS Catalogue of Life, 2014 Annual Checklist. Species 2000: Naturalis, Leiden, the Netherlands. Retrieved 29 June 2014.
- 1 2 3 4 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.). The University of Michigan.
- ↑ dos Santos, S. B. (2003). "Estado atual do conhecimento dos ancilídeos na América do Sul (Mollusca: Gastropoda: Pulmonata: Basommatophora)" [Current state of knowledge of ancylids in South America (Mollusca: Gastropoda: Pulmonata: Basommatophora)] (PDF). Revista de Biología Tropical (in Portuguese) (Redalyc) 51 (3): 191–223. Retrieved 29 June 2014.
External links
"Laevapex: Pictures". The Animal Diversity Web - University of Michigan.