†''Orthonychiidae'' is an extinct

taxonomic Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s in the clade

Cyrtoneritimorpha Cyrtoneritimorpha, also Cyrtoneritida, is a clade of fossil sea snails, marine gastropod mollusks within the clade Neritimorpha Neritimorpha is a taxonomic grouping, an unranked major clade of snails, gastropod mollusks. This grouping ...

. There is an unusually great degree of variability within the shells of species in the genus ''Orthonychia'', but an analysis of this variability has not been done yet (2008).

Genera

Genus ''Orthonychia'' Hall, 1843 *''Orthonychia acuta'' Roemer, 1856 *''Orthonychia baldwini'' Rohr et al., 1981 *''Orthonychia belli'' Clarke, 1908 *''Orthonychia bowsheri'' Yochelson, 1956 *''Orthonychia chesterense'' Meek & Worthen, 1866 *''Orthonychia concavum'' Hall, 1860 *''Orthonychia conicum'' Hall, 1860 *''Orthonychia conoidea'' (Goldfuss, 1844) *''Orthonychia cornuforme'' (Winchell, 1863) *''Orthonychia costata'' (Barrois, 1889) *''Orthonychia daschi'' (Rohr & Smith, 1978) *''Orthonychia dentalium'' Hall, 1862 *''Orthonychia enorme'' (Lindström, 1884) *''Orthonychia infabricatus'' Hyde, 1953 *''Orthonychia marblecreekensis'' Talent & Philip, 1956 *''Orthonychia obliquesulata'' Spitz, 1907 *''Orthonychia pajerensis'' Chronic, 1949 *''Orthonychia parva'' (Shumard & Swallow, 1858) *''Orthonychia parvulum'' Whiteaves, 1892 *''Orthonychia pentalvea'' Talent & Philip, 1956 *''Orthonychia perplexum'' (Hall, 1879) *''Orthonychia prosseri'' Clarke & Swartz, 1913 *''Orthonychia protei'' (Oehlert, 1883) *''Orthonychia puellaris'' (Whidborne, 1891) *''Orthonychia quadrangularis'' (Whidborne, 1891) *''Orthonychia rostratus'' (Trenkner, 1867) *''Orthonychia sciotoensis'' Hyde, 1953 *''Orthonychia sileni'' (Oehlert, 1883) *''Orthonychia subrectum'' Hall, 1860 - type species *''Orthonychia steinbergensis'' Kegel, 1926 *''Orthonychia talon'' Tolmachoff, 1930 *''Orthonychia tortuosa'' (Hall, 1860) *''Orthonychia trirotundolobatum'' (Talent & Philip, 1956) *''Orthonychia unguiculata'' Clarke & Swartz, 1913 *''Orthonychia variablis'' Tyler, 1965 *''Orthonychia vishtytica'' Saladzius, 1966 *''Orthonychia vomerium'' (Winchell, 1863) *''Orthonychia waverlyensis'' Hyde, 1953 * ''Orthonychia compressa'' / ''Platyceras'' (''Orthonychia'') ''compressum'' Girty 1910 * ''Orthonychia ungula'' / ''Platyceras'' (''Orthonychia'') ''ungula'' (Weller, 1906)"†''Platyceras'' (''Orthonychia'') ''ungula'' Weller 1906 (snail)"

Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ...

, accessed 8 August 2010.

References

{{Neritimorpha-stub