Retropluma Craverii

	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 Palicoidea * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	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 i ... [...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]
picture info	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 Turin ( , Piedmontese: ; it, Torino ) is a city and an important business and cultural centre in Northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. Th ..., 1815 – Bra, Piedmont, Bra, 1890) was an Italian explorer, ethnographer, geologist, meteorologist and natural history, 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-Mexica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	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 Cenozoic Era. The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which placed the fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]