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Cymatosyrinx Ziczac
''Cymatosyrinx'' is a genus of sea snails, marine gastropod mollusks in the family (biology), family Drilliidae. The following species have also been found as fossils in the United States and/or in Mexico in the age range: 37.2 to 0.012 Ma: ''Cymatosyrinx aclinica'' Tucker and Wilson 1933 (alternative combination: ''Cymatosyrinx lunata aclinica''), ''Cymatosyrinx dorseyi'' Cooke 1926, ''Cymatosyrinx limatula'' Conrad 1830 (synonyms: ''Drillia limatula'', ''Pleurotoma limatula''), ''Cymatosyrinx lunata'' Lea 1833, ''Cymatosyrinx magnoliana'' Olsson 1916, ''Cymatosyrinx mariana'' Petuch 1988, ''Cymatosyrinx perpolita'' Dall 1890, ''Cymatosyrinx tiara'' Gardner 1948, ''Cymatosyrinx ziczac'' Gardner 1948. Description This genus includes the thin-shelled light-colored species, previously included in ''Drillia'' The shell is generally short and stout, the Spire (mollusc), spire often very short. The Whorl (mollusc), whorls contain nodulous axial ribs, extending over the whole of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
