|
Bentharca
''Bentharca'' is a genus of ark clams. Fossil species placed in the genus have been identified from the lower Miocene (23.03 mya). Species It contains 2 extant species, and 2 extinct species. * ''Bentharca asperula ''Bentharca'' is a genus of ark clams. Fossil species placed in the genus have been identified from the lower Miocene (23.03 mya). Species It contains 2 extant species, and 2 Extinction, extinct species. * ''Bentharca asperula'' (Dall, 1881) * ...'' (Dall, 1881) * '' Bentharca avellanaria'' (Melvill & Standen, 1907) * †''Bentharca inexpectata'' (P. A. Maxwell, 1966) * †''Bentharca waitakarensis'' Eagle, 2000 References Arcidae Bivalve genera {{Bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bentharca Asperula
''Bentharca'' is a genus of ark clams. Fossil species placed in the genus have been identified from the lower Miocene (23.03 mya). Species It contains 2 extant species, and 2 Extinction, extinct species. * ''Bentharca asperula'' (Dall, 1881) * ''Bentharca avellanaria'' (Melvill & Standen, 1907) * †''Bentharca inexpectata'' (P. A. Maxwell, 1966) * †''Bentharca waitakarensis'' Eagle, 2000 References Arcidae Bivalve genera {{Bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ark Clam
Ark clam is the common name for a family of small to large-sized saltwater clams or marine bivalve molluscs in the family Arcidae. Ark clams vary both in shape and size. They number about 200 species worldwide. The shells of ark clams are often white or cream, but in some species, the shell is striped with, tinted with, or completely colored, a rich brown. In life the shell of most species has a top shell layer that is thick brown periostracum affixed to the harder calcareous part of the shell. In some species such as ''Barbatia'', this outer horny covering is tufted at the end of the shell into something that resembles a beard, hence the name ''Barbatia'' or bearded one. The group is known as "ark shells" because species such as '' Arca'' have a large flat area between the umbones which, in an undamaged shell, somewhat resembles a deck, with the rest of the shell perhaps illustrating an ancient wooden boat such as Noah's ark is thought to have been. All ark shells have a lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Katharine Jeannette Bush
Katharine Jeannette Bush (December 30, 1855 – January 19, 1937) was an American zoology, zoologist and marine biologist. Biography She was born in Scranton, Pennsylvania, Scranton, Pennsylvania, and was educated in the public and private schools of New Haven, Connecticut, New Haven, Connecticut. In 1901, she became the first woman to receive a Ph.D. in zoology at Yale University. In her dissertation, Bush described three new genera and sixteen new species of the Sabellides and Serpulides tribes, which were collected during the Harriman Alaska expedition, Harriman Alaska Expedition that her brother-in-law, Wesley Roswell Coe, attended in 1899. Bush studied zoology under Addison Emory Verrill, A. E. Verrill and in 1879 assumed the position of assistant in the Peabody Museum of Natural History, the zoological museum at Yale University, until 1913. She served on the United States Fish Commission between 1881 and 1888, helped to edit the 1890 edition of ''Webster's Dictionary, Webste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Species
Neontology is a part of biology that, in contrast to paleontology, deals with living (or, more generally, ''recent'') organisms. It is the study of extant taxa (singular: extant taxon): taxa (such as species, genera and families) with members still alive, as opposed to (all) being extinct. For example: * The moose (''Alces alces'') is an extant species, and the dodo (''Raphus cucullatus'') is an extinct species. * In the group of molluscs known as the cephalopods, there were approximately 600 extant species and 7,500 extinct species. A taxon can be classified as extinct if it is broadly agreed or certified that no members of the group are still alive. Conversely, an extinct taxon can be reclassified as extant if there are new discoveries of living species (" Lazarus species"), or if previously-known extant species are reclassified as members of the taxon. Most biologists, zoologists, and botanists are in practice neontologists, and the term neontologist is used larg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinction
Extinction is the termination of a kind of organism or of a group of kinds ( taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Extinction")