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Metacarcinus Starri
''Metacarcinus starri'' is an extinct species of crab in the family Cancridae, subfamily Cancrinae. The species is known solely from the early Miocene, Clallam Formation and the underlying Pysht Formation deposits on the Olympic Peninsula of Washington state, United States. History and classification The species is known from only the holotype female, number UWBM 92012, and five other specimens all of which are currently residing in the collections housed at the Burke Museum of Natural History and Culture in Seattle, Washington, USA. The type specimens were first studied by Ross E. Berglund and James L. Goedert. Berglund and Goedert's species description was published in the ''Journal of Paleontology'' in 1996. The specific epithet "''starri''" was coined by the authors in recognition of David Starr, who collected and donated one of the paratype specimens. When first described, ''M. starri'' was named ''Cancer (Metacarcinus) starri'' by Berglund and Goedert. In 1975, J. D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cancer (genus)
''Cancer'' is a genus of marine crabs in the family Cancridae. It includes eight extant species and three extinct species, including familiar crabs of the littoral zone, such as the European edible crab (''Cancer pagurus''), the Jonah crab (''Cancer borealis'') and the red rock crab ('' Cancer productus''). It is thought to have evolved from related genera in the Pacific Ocean in the Miocene. Description The species placed in the genus ''Cancer'' are united by the presence of a single posterolateral spine (on the edge of the carapace, towards the rear), anterolateral spines with deep fissures (on the carapace edge, towards the front), and a short extension of the carapace forward between the eyes. Their claws are typically short, with grainy or smooth, rather than spiny, keels. The carapace is typically oval, being 58%–66% as long as wide, and the eyes separated by 22%–29% of the carapace width. Species The genus ''Cancer'', as currently circumscribed, contains eight e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Callianassa
''Callianassa'' is a genus of mud shrimps, in the family Callianassidae. Three of the species in this genus ('' C. candida'', '' C. tyrrhena'' and '' C. whitei'') have been split off into a new genus, '' Pestarella'', while others such as '' Callianassa filholi'' have been moved to '' Biffarius''. Species Forty-six species are currently recognised in the genus ''Callianassa'': *'' Callianassa acutirostella'' Sakai, 1988 *'' Callianassa affinis'' A. Milne-Edwards, 1861 *''Callianassa amplimaxilla'' Sakai, 2002 *'' Callianassa anoploura'' Sakai, 2002 *'' Callianassa aqabaensis'' Dworschak, 2003 *'' Callianassa australis'' Kensley, 1974 *''Callianassa bangensis'' Sakai, 2005 *''Callianassa batei'' Woodward, 1869 *''Callianassa brachytelson'' Sakai, 2002 *''Callianassa brevirostris'' Sakai, 2002 *''Callianassa chakratongae'' Sakai, 2002 *''Callianassa contipes'' Sakai, 2002 *''Callianassa costaricensis'' Sakai, 2005 *''Callianassa diaphora'' Le Loeuff & Intes, 1974 *''Callianassa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thalassinidea
Thalassinidea is a former infraorder of decapod crustaceans that live in burrows in muddy bottoms of the world's oceans. In Australian English, the littoral thalassinidean ''Trypaea australiensis'' is referred to as the ''yabby'' (a term which also refers to freshwater crayfish of the genus ''Cherax''), frequently used as bait for estuarine fishing; elsewhere, however, they are poorly known, and as such have few vernacular names, "mud lobster" and "ghost shrimp" counting among them. The burrows made by thalassinideans are frequently preserved, and the fossil record of thalassinideans reaches back to the late Jurassic. The group was abandoned when it became clear that it represented two separate lineages, now both recognised as infraorders: Gebiidea and Axiidea. Recent molecular analyses have shown that thalassinideans are most closely related to Brachyura (crabs) and Anomura ( hermit crabs and their allies). There are believed to be 556 extant species of thalassinideans in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strait Of Juan De Fuca
The Strait of Juan de Fuca (officially named Juan de Fuca Strait in Canada) is a body of water about long that is the Salish Sea's outlet to the Pacific Ocean. The international boundary between Canada and the United States runs down the centre of the Strait. It was named in 1787 by the maritime fur trader Charles William Barkley, captain of '' Imperial Eagle'', for Juan de Fuca, the Greek navigator who sailed in a Spanish expedition in 1592 to seek the fabled Strait of Anián. Barkley was the first non-indigenous person to find the strait, unless Juan de Fuca's story was true. The strait was explored in detail between 1789 and 1791 by Manuel Quimper, José María Narváez, Juan Carrasco, Gonzalo López de Haro, and Francisco de Eliza. Definition The United States Geological Survey defines the Strait of Juan de Fuca as a channel. It extends east from the Pacific Ocean between Vancouver Island, British Columbia, and the Olympic Peninsula, Washington, to Haro Strait, San Ju ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concretion
A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin "(act of) compacting, condensing, congealing, uniting", itself from ''con'' meaning 'together' and ''crescere'' meaning "to grow". Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum. There is an important distinction to draw between concretions and nodules. Concretions are formed from mineral precipitation around some kind of nucleus while a nodule is a replacement body. Descriptions dating from the 18th ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sublittoral Zone
The neritic zone (or sublittoral zone) is the relatively shallow part of the ocean above the drop-off of the continental shelf, approximately in depth. From the point of view of marine biology it forms a relatively stable and well-illuminated environment for marine life, from plankton up to large fish and corals, while physical oceanography sees it as where the oceanic system interacts with the coast. Definition (marine biology), context, extra terminology In marine biology, the neritic zone, also called coastal waters, the coastal ocean or the sublittoral zone, refers to that zone of the ocean where sunlight reaches the ocean floor, that is, where the water is never so deep as to take it out of the photic zone. It extends from the low tide mark to the edge of the continental shelf, with a relatively shallow depth extending to about 200 meters (660 feet). Above the neritic zone lie the intertidal (or eulittoral) and supralittoral zones; below it the continental slope begin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the most populated subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento is the state's capital, while Los Angeles is the most populous city in the state and the second most populous city in the country. San Francisco is the second most densely populated major city in the country. Los Angeles County is the country's most populous, while San Bernardino County is the largest county by area in the country. California borders Oregon to the north, Nevada and Arizona to the east, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oregon
Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. The 42° north parallel delineates the southern boundary with California and Nevada. Oregon has been home to many indigenous nations for thousands of years. The first European traders, explorers, and settlers began exploring what is now Oregon's Pacific coast in the early-mid 16th century. As early as 1564, the Spanish began sending vessels northeast from the Philippines, riding the Kuroshio Current in a sweeping circular route across the northern part of the Pacific. In 1592, Juan de Fuca undertook detailed mapping and studies of ocean currents in the Pacific Northwest, including the Oregon coast as well as the strait now bearing his name. Spanish ships – 250 in as many years – would typically not land before reaching Cape Mendoci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metacarcinus Coosensis
''Metacarcinus'' is a genus of crabs formerly included in the genus ''Cancer''. It includes nine exclusively fossil species and five extant species, of which four are also known from the fossil record. A molecular study using the cytochrome oxidase I gene does not support the monophyly In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ... of this genus. Description ''Metacarcinus'' crabs have an oval carapace of about ⅔ of its largest width, with a surface with poorly marked division of smooth or gently colored regions. The front edge usually does not protrude before orbital, and the total length of these edges is 26–34% of the largest width of the carapace, with 5 spikes, including inner orbits, of which the middle springs lower than the others. 9–10 spikes are located on b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metacarcinus Gracilis
The graceful rock crab or slender crab, ''Metacarcinus gracilis'' (the naming convention recognized by WoRMS) or ''Cancer gracilis'' (the naming convention recognized by ITIS), is one of only two members of the genus '' Metacarcinus,'' recognized by WoRMS, whose chelae (claws) are white tipped, the other crab being ''M. magister'' ( Dungeness crab). Both of these eastern Pacific crab species are recognized by ITIS as belonging to the much larger genus ''Cancer''. ''M. gracilis'' has been caught from Alaska to Bahía Magdelena, Baja California. Although ''M. gracilis'' is only found in the Pacific Ocean, it has cousins in the Atlantic Ocean. The genus ''Cancer'' (''sensu lato'') apparently evolved in the Pacific Ocean and later migrated to the Atlantic Ocean. Larvae and small juveniles of this species are often seen riding jellyfish, especially '' Phacellophora camtschatica''. The juvenile crabs steal food from the jellyfish and also clean off parasitic amphipods Amphipoda is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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