|
Cerion Geophilum
''Cerion geophilum'' (occasionally known as ''Cerion geophilus)'' is a species of terrestrial gastropod in the family Cerionidae, endemic to Morales Beach, Cuba. Ecology and species-relationships ''Cerion geophilum'' is part of the distinct semi-square and flat-spired ''Cerion'' species clade (or complex) including ''Cerion disforme, C. disforme, Cerion alberti, alberti'' and ''Cerion torrei, torrei'' all of which are endemic to Holguín Province, Holguin Province. This species naturally hybridizes with ''Cerion torrei, C. torrei moralesi'' in the western reaches of Morales Beach. Variation between various ''Cerion'' species within small areas of coastline is significant in comparison to that of other terrestrial gastropod groups- along a 50 kilometer stretch of coastline, seven distinct species and many hybrids are present. Several hybrid-swarm populations were interpreted by Ernst Mayr, representing contact zones between various scattered populations of different species and m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cerionidae
Cerionidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea. Pre-2008 taxonomy According to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005), the family Cerionidae is classified in the superfamily Orthalicoidea, within the informal group Sigmurethra, itself belonging to the clade Stylommatophora within the clade Eupulmonata. The family Cerionidae has no subfamilies. 2008 taxonomy Uit de Weerd (2008) moved the Cerionidae to the newly established superfamily Urocoptoidea based on molecular phylogeny research.Uit de Weerd D. R. (2008). "Delimitation and phylogenetics of the highly diverse land snail family Urocoptidae (Gastropoda, Pulmonata) based on 28S rRNA sequence data: A reunion with ''Cerion''". ''Journal of Molluscan Studies'' 74: 317–329. . Fossil record The oldest fossil cerionid is '' C. acherontis'' from the Upper Cretaceous Hell Creek Formation, in Montana, northwestern USA.Roth, B. & Hart ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |