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Hemigrapsus
''Hemigrapsus'' is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region. Biogeography The natural range of the genus is restricted to the Pacific Ocean, except for '' Hemigrapsus affinis'' which lives along the Atlantic coasts of South America, from Cape São Roque (Rio Grande do Norte state, Brazil) to the San Matías Gulf, (Patagonia, Argentina). '' H. estellinensis'' is almost certainly extinct, but was endemic to a hypersaline spring in the Texas Panhandle, from the sea. Populations of ''Hemigrapsus sanguineus'' have been introduced from the species' native range in East Asia to several places, and now range along the Atlantic coast of North American from Portland, Maine to North Carolina, along the West European coast from northern Spain to Denmark, and in the northern Adriatic Sea and northern Black Sea. '' H. takanoi'' is native to East Asia, but has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Longitarsus
''Hemigrapsus'' is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region. Biogeography The natural range of the genus is restricted to the Pacific Ocean, except for '' Hemigrapsus affinis'' which lives along the Atlantic coasts of South America, from Cape São Roque (Rio Grande do Norte state, Brazil) to the San Matías Gulf, (Patagonia, Argentina). '' H. estellinensis'' is almost certainly extinct, but was endemic to a hypersaline spring in the Texas Panhandle, from the sea. Populations of ''Hemigrapsus sanguineus'' have been introduced from the species' native range in East Asia to several places, and now range along the Atlantic coast of North American from Portland, Maine to North Carolina, along the West European coast from northern Spain to Denmark, and in the northern Adriatic Sea and northern Black Sea. '' H. takanoi'' is native to East Asia, but has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Affinis
''Hemigrapsus'' is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region. Biogeography The natural range of the genus is restricted to the Pacific Ocean, except for '' Hemigrapsus affinis'' which lives along the Atlantic coasts of South America, from Cape São Roque (Rio Grande do Norte state, Brazil) to the San Matías Gulf, (Patagonia, Argentina). '' H. estellinensis'' is almost certainly extinct, but was endemic to a hypersaline spring in the Texas Panhandle, from the sea. Populations of ''Hemigrapsus sanguineus'' have been introduced from the species' native range in East Asia to several places, and now range along the Atlantic coast of North American from Portland, Maine to North Carolina, along the West European coast from northern Spain to Denmark, and in the northern Adriatic Sea and northern Black Sea. '' H. takanoi'' is native to East Asia, but has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Crassimanus
''Hemigrapsus'' is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region. Biogeography The natural range of the genus is restricted to the Pacific Ocean, except for ''Hemigrapsus affinis'' which lives along the Atlantic coasts of South America, from Cape São Roque (Rio Grande do Norte state, Brazil) to the San Matías Gulf, (Patagonia, Argentina). '' H. estellinensis'' is almost certainly extinct, but was endemic to a hypersaline spring in the Texas Panhandle, from the sea. Populations of ''Hemigrapsus sanguineus'' have been introduced from the species' native range in East Asia to several places, and now range along the Atlantic coast of North American from Portland, Maine to North Carolina, along the West European coast from northern Spain to Denmark, and in the northern Adriatic Sea and northern Black Sea. '' H. takanoi'' is native to East Asia, but has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Gibbus
''Hemigrapsus'' is a genus of varunid crabs comprising thirteen species native almost exclusively in the Pacific Ocean, but two have been introduced to the North Atlantic region. Biogeography The natural range of the genus is restricted to the Pacific Ocean, except for ''Hemigrapsus affinis'' which lives along the Atlantic coasts of South America, from Cape São Roque (Rio Grande do Norte state, Brazil) to the San Matías Gulf, (Patagonia, Argentina). '' H. estellinensis'' is almost certainly extinct, but was endemic to a hypersaline spring in the Texas Panhandle, from the sea. Populations of ''Hemigrapsus sanguineus'' have been introduced from the species' native range in East Asia to several places, and now range along the Atlantic coast of North American from Portland, Maine to North Carolina, along the West European coast from northern Spain to Denmark, and in the northern Adriatic Sea and northern Black Sea. '' H. takanoi'' is native to East Asia, but has been ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Sanguineus
''Hemigrapsus sanguineus'', the Japanese shore crab or Asian shore crab, is a species of crab from East Asia. It has been introduced to several other regions, and is now an invasive species in North America and Europe. It was introduced to these regions by ships from Asia emptying their ballast tanks in coastal waters. Description ''H. sanguineus'' has a squarish carapace, in width, with three teeth along the forward sides; its pereiopods are marked with alternating light and dark bands. The males have a bulb-like structure at the base of the movable finger on their claws. Other distinguishing features include three spines on each side of the carapace. Adult sizes range from 35–42 mm width. These crabs are opportunistic omnivores that tend to favor other animals over algae. As crab density in an invaded area increases, so does the breadth of the species' diet, which suggests that competition alters selection of food. There currently is no mitigation against these ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Takanoi
''Hemigrapsus takanoi'', the brush-clawed shore crab or Asian shore crab, is a small crab of the family Varunidae (formerly classified as Grapsidae) that lives on rocky shores surrounding the Pacific Ocean, and which is invasive along the European coastlines. This crab is omnivorous and eats small fish, invertebrates and algae. Description Prior to 2005, the name ''Hemigrapsus penicillatus'' was used to cover animals that are now known to represent two distinct species. '' Hemigrapsus penicillatus'' (''sensu stricto'') has smaller patches of setae (bristles) on the chelae (claws) in males; ''Hemigrapsus takanoi'' has larger setal patches and larger coloured spots on the exoskeleton. It can be a variety of colors, including orange-brown, maroon, or green, with striped legs and spotted claws. Male brush-clawed shore crabs have a patch of light brown or yellow bristles (known as setae) on their chelae (pincers). Their carapace width typically reaches about , and has three spines. Bef ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Estellinensis
''Hemigrapsus estellinensis'' is an extinct species of crab, formerly endemic to the Texas Panhandle. It was discovered by Gordon C. Creel in 1962 and was probably already extinct before his description was published in 1964, after the Estelline Salt Springs where it lived were contained by the United States Army Corps of Engineers. ''H. estellinensis'' is closely related to species from the Pacific Ocean such as '' Hemigrapsus oregonensis'', but lived inland in a hypersaline spring. It differed from its relatives by the pattern of spots on its back, and by the relative sizes of its limbs. Description ''Hemigrapsus estellinensis'' has a rectangular carapace with almost parallel sides. Males have a carapace length of up to and a carapace width of up to , while females have a carapace up to long and wide. The front corners of the carapace are developed into three strong teeth on each side. The chief difference between ''H. estellinensis'' and other species in the gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Nudus
The purple shore crab (''Hemigrapsus nudus'') is a common crab of the family Varunidae. It can be found sheltering under rocks in inter-tidal areas along the west coast of North America, from Alaska to Baja California in Mexico. This crab primarily eats sea lettuce and other green algae, and occasionally scavenges dead animals. Description A small crab, ''H. nudus'' reaches sizes of approximately . Its dorsal shell (carapace) is generally a dark purple in color, although it may be olive green or red, with white or cream markings. The color of the legs matches the color of the carapace but the white-tipped claws ( chelipeds) are a lighter color with purple or red spots – these spots allow ''H. nudus'' to be distinguished from a similar looking crab, the lined shore crab, ''Pachygrapsus crassipes'', whose chelipeds lack spots. The legs of ''H. nudus'' lack setae, a distinguishing feature of the otherwise similar '' H. oregonensis''. References External links * {{DEFAULTSORT ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemigrapsus Crenulatus
''Hemigrapsus crenulatus'', the hairy-handed crab or ', is a marine crab of the family Varunidae, endemic to the New Zealand coast, although a taxon in Chile may be conspecific. It is an intertidal species with semi-terrestrial tendencies. They are named by their characteristic setae, or patches of thick hair, on the chelipeds and legs.Bennett, E.W. (1964). The marine fauna of New Zealand: Crustacea Brachyura. New Zealand Department of Scientific and Industrial Research (Bulletin 153) lso published as New Zealand Oceanographic Institute Memoir 22./ref> They can range from green to brown in coloration. Adult crabs are generally 2–4 cm (0.8–1.6 in) wide at the carapace, although the smallest mature crabs can be around just 1 cm (0.4 in) wide. and are able to survive and reproduce in environments of widely varying salinities. History There have been disputes throughout history about whether the two geographically distant populations were truly of the same s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Varunidae
The Varunidae are a 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 Xenograpsidae. The foll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adriatic Sea
The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Sea) to the northwest and the Po Valley. The countries with coasts on the Adriatic are Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia. The Adriatic contains more than 1,300 islands, mostly located along the Croatian part of its eastern coast. It is divided into three basins, the northern being the shallowest and the southern being the deepest, with a maximum depth of . The Otranto Sill, an underwater ridge, is located at the border between the Adriatic and Ionian Seas. The prevailing currents flow counterclockwise from the Strait of Otranto, along the eastern coast and back to the strait along the western (Italian) coast. Tidal movements in the Adriatic are slight, although larger amplitudes are known to occur occasi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
