| 词条 | Hebetancylus excentricus |
| 释义 |
| name = Hebetancylus excentricus | image = | image_caption = | status = G5 | status_system = TNC | status_ref = [1] | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila | superfamilia = Planorboidea | familia = Planorbidae | subfamilia = Planorbinae | tribus = Ancylini | genus = Hebetancylus | species = H. excentricus | binomial = Hebetancylus excentricus | binomial_authority = (Morelet, 1851) | synonyms = }}Hebetancylus excentricus, the excentric ancylid, is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc or micromollusc in the family Planorbidae, the ram's horn snails and their allies.[2][3] Geographic distributionH. excentricus is widely distributed across North and Central America and the Caribbean.[1] The main area of its North American range extends from Florida to Texas, but it has also been reported from scattered ponds and river backwaters along the length of the southern Atlantic Coastal Plain as far north as North Carolina. This pattern of contagious distribution suggests that the species is possibly being dispersed through the air by migratory waterfowl.[4][5]Habitat and ecologyH. excentricus usually occurs on rocks in fast-flowing streams and occasionally on rocks and rooted aquatic vegetation in lakes and the impounded backwaters of rivers and streams.[6] It also occurs on submerged sticks, logs, and large items of organic debris.[4]Annual, bi- and trivoltine life cycles have been reported in Louisiana[4] and Texas[6] populations of H. excentricus; however, this increased number of generations occurs without an increase in population growth rates.[6] References1. ^1 {{cite web| url=http://explorer.natureserve.org/servlet/NatureServe?searchName=Hebetancylus+excentricus| title=Hebetancylus excentricus - (Morelet, 1851)| publisher=NatureServe| accessdate=27 June 2014}} {{Taxonbar|from=Q14630764}}{{planorbidae-stub}}2. ^{{cite web|url=http://www.catalogueoflife.org/annual-checklist/2014/details/species/id/13010735|year= 2014| editor=Roskov Y.| editor2= Kunze T.| editor3=Orrell T.| editor4=Abucay L.| editor5=Paglinawan L.| editor6=Culham A.| editor7=Bailly N.| editor8=Kirk P.| editor9=Bourgoin T.| editor10=Baillargeon G.| editor11=Decock W.| editor12=De Wever A.| editor13=Didžiulis V.| title=Hebetancylus excentricus Morelet 1851 |work=Species 2000 & ITIS Catalogue of Life, 2014 Annual Checklist| publisher=Species 2000: Naturalis, Leiden, the Netherlands |accessdate=29 June 2014}} 3. ^{{cite WoRMS| author=Bouchet, P.| year=2014| id=743609| title=Hebetancylus excentricus (Morelet, 1851)|accessdate=29 June 2014}} 4. ^1 2 {{cite web| url=http://www.fwgna.org/species/ancylidae/h_excentricus.html| title=Hebetancylus excentricus (Morelet 1851)| author=Dillon, R. T. Jr.| author2=Watson, B.T.| author3=Stewart, T. W.| author4=Reeves, W. K.| last-author-amp=yes| date=2006| work=The freshwater gastropods of North America| accessdate=29 June 2014}} 5. ^{{cite web| url=http://fwgna.blogspot.gr/2005/11/aerial-dispersal-of-freshwater.html| author=Dillon, R. T.| date=2005| title=Aerial Dispersal of Freshwater Gastropods| publisher=The Blog of the FWGNA Project| accessdate=29 June 2014}} 6. ^1 2 {{cite journal| author=McMahon, R. F.| year=1976| title=Growth, reproduction and life cycle in six Texan populations of two species of fresh-water limpets| journal=American Midland Naturalist| publisher=The University of Notre Dame| volume=95| number=1| pages=174–185| doi=10.2307/2424243}} 3 : Planorbidae|Molluscs of North America|Gastropods described in 1851 |
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