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Xantho
''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species from '' Xantho hydrophilus'': *'' Xantho granulicarpus'' Forest, 1953 *'' Xantho hydrophilus'' (Herbst, 1790) *'' Xantho pilipes'' A. Milne-Edwards, 1867 *''Xantho poressa ''Xantho poressa'', the jaguar round crab, is a species of crab from the eastern Atlantic Ocean. It is one of four species in the genus ''Xantho''. Description The juveniles of ''X. poressa'' are cryptically coloured as camouflage among the epib ...'' (Olivi, 1792) *'' Xantho sexdentatus'' (Miers, 1881) Five species are known from the fossil record, including one species that is still extant. References Xanthoidea Crustaceans of the Atlantic Ocean Miocene crustaceans Pliocene crustaceans Pleistocene crustaceans {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Hydrophilus
''Xantho hydrophilus'', the furrowed crab or Montagu's crab, is a species of crab from the family Xanthidae. It is yellowish-brown and grows to a carapace width of . It is a nocturnal omnivore that lives in shallow marine waters from western Scotland to the Cape Verde Islands. Description The carapace of ''Xantho hydrophilus'' reaches a width of , and a length of up to . The dorsal surface of the carapace has a smooth appearance to the unaided eye but on closer examination it can be seen to be finely granular. The antero-lateral edge of the carapace bears five blunt lobes. The chelipeds are large and robust and equal in size and lack spines or tubercles, the pereiopods (walking legs) are relatively short and rather stout. It is yellowish-brown, except for the tips of the chelae, which are black. ''X. hydrophilus'' closely resembles ''X. pilipes'', from which it can be distinguished by the absence of fringes of setae on the second to fifth pairs of pereiopods (walking legs). Othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Granulicarpus
''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species from ''Xantho hydrophilus'': *'' Xantho granulicarpus'' Forest, 1953 *''Xantho hydrophilus'' (Herbst, 1790) *'' Xantho pilipes'' A. Milne-Edwards, 1867 *''Xantho poressa ''Xantho poressa'', the jaguar round crab, is a species of crab from the eastern Atlantic Ocean. It is one of four species in the genus ''Xantho''. Description The juveniles of ''X. poressa'' are cryptically coloured as camouflage among the epib ...'' (Olivi, 1792) *'' Xantho sexdentatus'' (Miers, 1881) Five species are known from the fossil record, including one species that is still extant. References Xanthoidea Crustaceans of the Atlantic Ocean Miocene crustaceans Pliocene crustaceans Pleistocene crustaceans {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Sexdentatus
''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species from ''Xantho hydrophilus'': *''Xantho granulicarpus'' Forest, 1953 *''Xantho hydrophilus'' (Herbst, 1790) *'' Xantho pilipes'' A. Milne-Edwards, 1867 *''Xantho poressa ''Xantho poressa'', the jaguar round crab, is a species of crab from the eastern Atlantic Ocean. It is one of four species in the genus ''Xantho''. Description The juveniles of ''X. poressa'' are cryptically coloured as camouflage among the epib ...'' (Olivi, 1792) *'' Xantho sexdentatus'' (Miers, 1881) Five species are known from the fossil record, including one species that is still extant. References Xanthoidea Crustaceans of the Atlantic Ocean Miocene crustaceans Pliocene crustaceans Pleistocene crustaceans {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Pilipes
''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species from ''Xantho hydrophilus'': *''Xantho granulicarpus'' Forest, 1953 *''Xantho hydrophilus'' (Herbst, 1790) *'' Xantho pilipes'' A. Milne-Edwards, 1867 *''Xantho poressa'' (Olivi, 1792) *''Xantho sexdentatus ''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species ...'' (Miers, 1881) Five species are known from the fossil record, including one species that is still extant. References Xanthoidea Crustaceans of the Atlantic Ocean Miocene crustaceans Pliocene crustaceans Pleistocene crustaceans {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Granulicarpis
''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species from ''Xantho hydrophilus'': *''Xantho granulicarpus'' Forest, 1953 *''Xantho hydrophilus'' (Herbst, 1790) *''Xantho pilipes'' A. Milne-Edwards, 1867 *''Xantho poressa'' (Olivi, 1792) *''Xantho sexdentatus ''Xantho'' is a genus of crabs in the family Xanthidae, containing five extant species, all restricted to the north-east Atlantic Ocean and Mediterranean Sea, although '' Xantho granulicarpis'' is not universally recognised as a separate species ...'' (Miers, 1881) Five species are known from the fossil record, including one species that is still extant. References Xanthoidea Crustaceans of the Atlantic Ocean Miocene crustaceans Pliocene crustaceans Pleistocene crustaceans {{crab-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xantho Poressa
''Xantho poressa'', the jaguar round crab, is a species of crab from the eastern Atlantic Ocean. It is one of four species in the genus ''Xantho''. Description The juveniles of ''X. poressa'' are cryptically coloured as camouflage among the epibionts on the leaves of ''Posidonia'' with a variable carapace colour, which can be yellowish, reddish, brown, or dark grey with patches of another colour, usually white. The pereiopods are usually banded with dark brown or black bands alternating with white or translucent stripes or spots, although the fifth pereiopod is brighter and often unmarked. The adults are uniformly dark grey in colour and they leave the seagrass beds for more open, rocky substrates. Distribution ''X. poressa'' is distributed throughout the Black Sea and the Mediterranean Sea and into the warmer parts of the north eastern Atlantic to the Canary Islands. Biology The larvae of ''X. poressa'' go through four zoeal and one megalopal stages, which are typical of most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xanthoidea
Xanthoidea is a superfamily of crabs, comprising the three families Xanthidae, Panopeidae and Pseudorhombilidae. Formerly, a number of other families were included in Xanthoidea, but many of these have since been removed to other superfamilies. These include Carpilioidea, Eriphioidea, Hexapodoidea, Pilumnoidea and Trapezioidea. Even in this reduced state, Xanthoidea remains one of the most species-rich superfamilies of crabs. Families The World Register of Marine Species lists the following families: *Panopeidae Ortmann, 1893 * Pseudorhombilidae Alcock, 1900 *Xanthidae Xanthidae is a family of crabs known as gorilla crabs, mud crabs, pebble crabs or rubble crabs. Xanthid crabs are often brightly coloured and are highly poisonous, containing toxins which are not destroyed by cooking and for which no antidote is ... MacLeay, 1838 References External links * Crabs Arthropod superfamilies {{crab-stub ... [...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] |
Xanthidae
Xanthidae is a family of crabs known as gorilla crabs, mud crabs, pebble crabs or rubble crabs. Xanthid crabs are often brightly coloured and are highly poisonous, containing toxins which are not destroyed by cooking and for which no antidote is known. The toxins are similar to the tetrodotoxin and saxitoxin produced by puffer fish, and may be produced by bacteria in the genus ''Vibrio'' living in symbiosis with the crabs, mostly '' V. alginolyticus'' and '' V. parahaemolyticus''. Classification Many species formerly included in the family Xanthidae have since been moved to new families. Despite this, Xanthidae is still the largest crab family in terms of species richness, with 572 species in 133 genera divided among the thirteen subfamilies: * Actaeinae Alcock, 1898 **'' Actaea'' De Haan, 1833 **'' Actaeodes'' Dana, 1851 **'' Actaeops'' † Portell & Collins, 2004 **'' Allactaea'' Williams, 1974 **'' Epiactaea'' Serène, 1984 **'' Epiactaeodes'' Serène, 1984 **''Forestia'' Gu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene Crustaceans
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 late ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustaceans Of The Atlantic Ocean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossil Record
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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