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Retropluma Craverii
''Retropluma craverii'' is an extinct species of heterotrematan crabs belonging to the family Retroplumidae. The species name ''craverii'' honors the Italian explorer and naturalist Federico Craveri. Fossil record Fossils of ''Retropluma craverii'' are found in marine strata of the Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterotremata
Heterotremata is a clade of crabs, comprising those crabs in which the genital openings are on the sternum in females, but on the legs in males. It comprises 68 families in 28 superfamilies. Evolution Heterotremata is the sister group to Thoracotremata within the clade Eubrachyura, having diverged during the Cretaceous period. Eubrachyura itself is a subset of the larger clade Brachyura, which consists of all "true crabs". A summary of the high-level internal relationships within Brachyura can be shown in the cladogram below: The internal relationships within Heterotremata are less certain, with many of the superfamilies found to be invalid. The proposed cladogram below is from analysis by Tsang ''et al'', 2014: Superfamilies * Aethroidea * Bellioidea * Bythograeoidea *Calappoidea *Cancroidea * Carpilioidea * Cheiragonoidea * Corystoidea * Dairoidea * Dorippoidea * Eriphioidea * Gecarcinucoidea * Goneplacoidea * Hexapodoidea * Leucosioidea *Majoidea * Orithyioidea * Pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crab
Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) ( el, βραχύς , translit=brachys = short, / = tail), usually hidden entirely under the thorax. They live in all the world's oceans, in freshwater, and on land, are generally covered with a thick exoskeleton, and have a single pair of pincers. They first appeared during the Jurassic Period. Description Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a pair of chelae (claws). Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to . Several other groups of crustaceans with similar appearances – such as king crabs and porcelain crabs – are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation. Environment Crabs are found in all of the world's oceans, as well as in fresh w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retroplumidae
Retroplumidae is a family of heterotrematan crabs, placed in their own (monotypic) superfamily, Retroplumoidea. Classification Eight genera are recognised, of which all but two are only known from fossils: *'' Archaeopus'' † Rathbun, 1908 *'' Bathypluma'' de Saint Laurent, 1989 *'' Costacopluma'' † Collins & Morris, 1975 *'' Cristipluma'' † Bishop, 1983a *'' Loerentheya'' † Lőrenthey, in Lőrenthey & Beurlen, 1929 *'' Loerenthopluma'' † Beschin, Busulini, De Angeli & Tessier, 1996 *'' Retrocypoda'' † Vía, 1959 *'' Retropluma'' Gill, 1894 Ten species in two genera survive in the deep sea of the Indo-Pacific region: *'' Bathypluma chuni'' (Doflein, 1904) *'' Bathypluma forficula'' De Saint Laurent, 1989 *'' Bathypluma spinifer'' De Saint Laurent, 1989 *'' Retropluma denticulata'' Rathbun, 1932 *'' Retropluma quadrata'' De Saint Laurent, 1989 *''Retropluma notopus'' (Alcock & Anderson, 1894) *''Retropluma planiforma'' Kensley, 1969 *''Retropluma plumosa'' Tesch, 1918 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explorer
Exploration refers to the historical practice of discovering remote lands. It is studied by geographers and historians. Two major eras of exploration occurred in human history: one of convergence, and one of divergence. The first, covering most of ''Homo sapiens'' history, saw humans moving out of Africa, settling in new lands, and developing distinct cultures in relative isolation. Early explorers settled in Europe and Asia; 14,000 years ago, some crossed the Ice Age land bridge from Siberia to Alaska, and moved southbound to settle in the Americas. For the most part, these cultures were ignorant of each other's existence. The second period of exploration, occurring over the last 10,000 years, saw increased cross-cultural exchange through trade and exploration, and marked a new era of cultural intermingling, and more recently, convergence. Early writings about exploration date back to the 4th millennium B.C. in ancient Egypt. One of the earliest and most impactful thinkers of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Federico Craveri
Federico Craveri (Turin, 1815 – Bra, 1890) was an Italian explorer, ethnographer, geologist, meteorologist and naturalist noted for his studies in Mexico. Biography Federico Craveri studied chemistry and meteorology at the University of Turin. In 1840 he moved to Mexico, which had recently gained independence from Spain. From 1840 until 1859 he taught chemistry at the National Museum in Mexico City. In Mexico, he obtained a graduation in Chemistry and Pharmacy. In 1847 he was joined in Mexico for two years by his brother Ettore, who shared similar interest in nature. Federico Craveri explored this country for a few years (1855–1857) to study its geology, with particular regard to the Trans-Mexican Volcanic Belt. In Mexico as well in the United States Federico Craveri collected specimens of many animals and plants. These collections were placed, on his return to Italy, in the family home of Bra. For thirty years he took care of the classification of the material brought back ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58See the 2014 version of the ICS geologic time scale million years ago. It is the second and most recent epoch of the Neogene Period in the . The Pliocene follows the Epoch and is followed by the Epoch. Prior to the 2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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