|
List Of Prehistoric Ostracod Genera
This list of prehistoric ostracods is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be members of the Ostracoda, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ('' nomina dubia''), or were not formally published (''nomina nuda''), as well as junior synonyms of more established names, and genera that are no longer considered ostracods. List *'' Aaleniella'' *'' Abditoloculina'' *'' Abrobairdia'' *'' Abrocythereis'' *'' Absonocytheropteron'' *'' Abursus'' *'' Abyssobairdia'' *'' Abyssocypris'' *'' Abyssocythere'' *'' Abyssocythereis'' *'' Acanthobolbina'' *'' Acanthocythere'' *'' Acanthocythereis'' *''Acanthomeridion'' *'' Acanthoscapha'' *'' Acantonodella'' *'' Acratia'' *'' Acratina'' *'' Acratinella'' *'' Acravincula'' *'' Acrocythere'' *'' Acronotella'' *'' Acrossula'' *'' Actiangulata'' *'' Actinochilina'' *'' Acti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthomeridion
''Acanthomeridion'' is an extinct arthropod found in the Chengjiang fauna deposits of China. In 1997, it was placed in its own, monotypic family, Acanthomeridiidae. It is known from eight specimens, all found in China. Morphology ''Acanthomeridion'' was a 35 mm-long animal, with 11 segments ending in rear-facing spines. The head features free cheeks separated from the rest of the head by sutures. This is analogous with trilobites. Otherwise, affinities are mainly unclear. More recently discovered specimens of the species ''Acanthomeridion anacanthus'' have paired gut diverticula as have been seen in artiopods. No fossils exposing the limbs have yet been found, but they are thought to be biramous with the upper section of the limb holding the gills. As limbs have not been found, it is uncertain whether ''Acanthomeridion'' was a seafloor-dweller or a swimmer. The streamlining suggests that it swam, but is inconclusive. Taxonomy ''Acanthomeridion'' is considered a primitiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
