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Grapsoidea
The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water). Another well-known member with a more conventional lifestyle is the Chinese mitten crab, ''Eriocheir sinensis''. The delimitation of the Grapsidae and Plagusiidae is in need of revision; the latter at least is not monophyletic. The same apparently holds true for several genera in the Sesarmidae. The closest living relatives of the Grapsoidea are the Ocypodoidea. In fact, they seem to be paraphyletic Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ... with respect to each other and it seems warranted to merge the Ocypodoidea into the Grapsoidea. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varunidae
The Varunidae are a family (biology), family of thoracotrematan crabs. The delimitation of this family, part of the taxonomically confusing Grapsoidea, is undergoing revision. For a long time, they were placed at the rank of subfamily in the Grapsidae, but they appear to be closest to ''Macropthalmus'' and the Mictyridae, which are usually placed in the Ocypodoidea. It may thus be better to merge the latter superfamily with the Grapsoidea, retaining the latter name as it is older. That notwithstanding, the revision of the Grapsoidea (in the narrow but apparently still paraphyletic sense) is also not fully completed, as many taxa remain to be restudied. Already, several former Grapsidae genera have been moved to the Varunidae, and others are tentatively placed here pending detailed study. Among the most noteworthy of these is the Chinese mitten crab, ''Eriocheir sinensis''. The genus ''Xenograpsus'', formerly included in the Varunidae, is now placed in its own family, the Xenograps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Percnidae
Percnidae is a family of crabs in the superfamily Grapsoidea The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water). Another well-known member wit .... Percnidae contains about six described species in one genus: '' Percnon'' (Gistel, 1848). References Further reading * * * * Grapsoidea Decapod families Monogeneric crustacean families {{Grapsoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gecarcinidae
The Gecarcinidae, the land crabs, are a family of true crabs that are adapted for terrestrial existence. Similar to all other crabs, land crabs possess a series of gills. In addition, the part of the carapace covering the gills is inflated and equipped with blood vessels. These organs extract oxygen from the air, analogous to the vertebrate lungs. Adult land crabs are terrestrial, but visit the sea periodically, where they breed and their larvae develop. Land crabs are tropical omnivores which sometimes cause considerable damage to crops. Most land crabs have one of their claws larger than the other. The family contains these genera: * '' Cardisoma'' * ''Discoplax ''Discoplax'' is a genus of terrestrial crabs. It is very closely related to the genera '' Cardisoma'' and '' Tuerkayana''. ''Discoplax'' contains the following species: References Further reading * Grapsoidea Terrestrial crustac ...'' * '' Epigrapsus'' * '' Gecarcinus'' * '' Gecarcoidea'' * '' Johng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crabs
Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek), which typically have a very short projecting tail-like abdomen, usually hidden entirely under the thorax. Their exoskeleton is often thickened and hard. They generally have five pairs of legs, and they have "pincers" or "claws" on the ends of the frontmost pair, scientifically termed the '' chelae''. They are present in all the world's oceans, in freshwater, and on land, often hiding themselves in small crevices or burrowing into sediment. Crabs are omnivores, feeding on a variety of food, including a significant proportion of algae, as well as detritus and other invertebrates. Crabs are widely consumed by humans as food, with over 1.5 million tonnes caught annually. True crabs first appeared in the fossil record during the Jurassic period, around 200 million years ago, achieving great diversity by the Cretaceous period; around 7,000 extant species in 96 families are known. A numb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesarmidae
The Sesarmidae are a family of crabs, previously included in the Grapsidae by many authors. Several species, namely in '' Geosesarma'', '' Metopaulias'', and '' Sesarma'', are true terrestrial crabs. They do not need to return to the sea even for breeding. Genera The family contains these genera: *''Aratus Aratus (; ; c. 315/310 240 BC) was a Greek didactic poet. His major extant work is his hexameter poem ''Phenomena'' (, ''Phainómena'', "Appearances"; ), the first half of which is a verse setting of a lost work of the same name by Eudoxus of Cn ...'' *'' Armases'' *'' Bresedium'' *'' Chiromantes'' *'' Clistocoeloma'' *'' Contusarma'' *'' Cristarma'' *'' Danarma'' *'' Episesarma'' *'' Fasciarma'' *'' Geosesarma'' *'' Guinearma'' *'' Haberma'' *'' Karstarma'' *'' Labuanium'' *'' Leptarma'' *'' Manarma'' *'' Metagrapsus'' *'' Metasesarma'' *'' Metopaulias'' *'' Miersarma'' *'' Migmarma'' *'' Muradium'' *'' Namlacium'' *'' Nanosesarma'' *'' Neosarmati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plagusiidae
The Plagusiidae are a family (biology), family of crabs, formerly treated as a subfamily of the family Grapsidae, but have since been considered sufficiently distinct to be a family in their own right. The family Plagusiidae used to include a subfamily Plagusiinae, comprising the genera ''Percnon'' and ''Plagusia'', which constitute a widespread group of litophilic, intertidal and subtidal crabs that are notorious for their speed and their agility. Six genera are currently included in the family: *''Caligoplagusia'' Fujita & Narusa, 2014 *''Davusia'' Guinot, 2007 *''Euchirograpsus'' H. Milne-Edwards, 1853 *''Guinusia'' Schubart & Cuesta, 2010 *''Miersiograpsus'' Türkay, 1978 *''Plagusia'' Latreille, 1804 References Grapsoidea Decapod families {{Grapsoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crab
Crabs are decapod crustaceans of the infraorder Brachyura (meaning "short tailed" in Greek language, Greek), which typically have a very short projecting tail-like abdomen#Arthropoda, abdomen, usually hidden entirely under the Thorax (arthropod anatomy), thorax. Their exoskeleton is often Sclerotization, thickened and hard. They generally have Arthropod leg, five pairs of legs, and they have "Pincers (tool), pincers" or "claws" on the ends of the frontmost pair, scientifically termed the ''chelae''. They are present in all the world's oceans, Freshwater crab, in freshwater, and Terrestrial crab, on land, often hiding themselves in small crevices or burrowing into sediment. Crabs are omnivores, feeding on a variety of food, including a significant proportion of Algae eater, algae, as well as Detritivore, detritus and other invertebrates. Crab meat, Crabs are widely consumed by humans as food, with over 1.5 million tonnes Crab fisheries, caught annually. True crabs first appeared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glyptograpsidae
Glyptograpsidae is a family of crabs belonging to the superfamily Grapsoidea The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water). Another well-known member wit .... Genera: * '' Glyptograpsus'' Smith, 1870 * '' Platychirograpsus'' de Man, 1896 References Crabs Decapod families {{brachyura-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinese Mitten Crab
The Chinese mitten crab (''Eriocheir sinensis''; ; Jyutping: daai6 zaap6 haai5; Shanghainese: ''du6-zaq8-ha5'', "big sluice crab"), also known as the Shanghai hairy crab (, p ''Shànghǎi máoxiè''), is a medium-sized burrowing crab that is named for its furry claws, which resemble mittens. It is native to rivers, estuaries and other coastal habitats of East Asia from Korea in the north to Fujian, China in the south. It has also been introduced to Europe and North America, where it is considered an invasive species. The species features on the list of invasive alien species of Union concern. This means that the import of the species and trade in the species is forbidden in the whole of the European Union. Description and ecology This species' distinguishing features are the dense patches of dark setae on its claws. The crab's body is the size of a human palm. The legs are about twice as long as the carapace. Chinese mitten crabs spend most of their life in fres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purple Shore Crab
The purple shore crab (''Hemigrapsus nudus'' or the naked shore crab) is a common crab of the family ''Varunidae'' that is Native species, indigenous to the west coast of United States, Canada, and Mexico. ''H. nudus'' was first described in 1847 by Adam White (zoologist), Adam White, and in 1851, James Dwight Dana formally classified the species. ''H. nudus'' is a small, Amphibian, amphibious crab that is similar physically and behaviorally to ''Pachygrapsus crassipes'' and ''Hemigrapsus oregonensis''. The purple shore crab is generally a dark purple color with olive green, red, and white spots. Seasonal breeder, Mating season for ''H. nudus'' begins in mid-winter and larval crabs undergo 5 Crustacean larva, zoeal stages and a juvenile stage. Adult crabs mainly feed on algae but will occasionally scavenge other animals. ''H. nudus'' prefers intertidal zone, inter-tidal and Neritic zone, sub-tidal zones, and it can oftentimes be found sheltering under rocks or other debris. ''H. n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
