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Dungeness Crab
The Dungeness crab (''Metacarcinus magister'') is a species of crab inhabiting eelgrass beds and water bottoms along the west coast of North America. It typically grows to across the carapace and is a popular seafood. Its common name comes from Dungeness Spit, United States, which shelters a shallow bay inhabited by the crabs. Description The carapace widths of mature Dungeness crabs may reach 10 inches, or 25.4 centimeters, but are typically 6-7 inches, or approximately 15-18 centimeters. They are a popular delicacy, and are the most commercially important crab in the Pacific Northwest, as well as the western states generally. The annual Dungeness Crab and Seafood Festival is held in Port Angeles, Washington each October. Dungeness crabs have a wide, long, hard shell, which they must periodically moult to grow; this process is called ecdysis. They have five pairs of legs, which are similarly armoured, the foremost pair of which ends in claws the crab uses both as defens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
James Dwight Dana
James Dwight Dana FRS FRSE (February 12, 1813 – April 14, 1895) was an American geologist, mineralogist, volcanologist, and zoologist. He made pioneering studies of mountain-building, volcanic activity, and the origin and structure of continents and oceans around the world. His zoological author abbreviation is Dana. Early life and career Dana was born February 12, 1813, in Utica, New York. His father was merchant James Dana (1780–1860) and his mother was Harriet Dwight (1792–1870). Through his mother he was related to the Dwight New England family of missionaries and educators including uncle Harrison Gray Otis Dwight and first cousin Henry Otis Dwight. He showed an early interest in science, which had been fostered by Fay Edgerton, a teacher in the Utica high school, and in 1830 he entered Yale College in order to study under Benjamin Silliman the elder. Graduating in 1833, for the next two years he was teacher of mathematics to midshipmen in the Navy, and sailed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostrum (anatomy)
Rostrum (from Latin ', meaning ''beak'') is a term used in anatomy for a number of phylogenetically unrelated structures in different groups of animals. Invertebrates * In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes. It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca. * Among insects, the rostrum is the name for the piercing mouthparts of the order Hemiptera as well as those of the snow scorpionflies, among many others. The long snout of weevils is also called a rostrum. * Gastropod molluscs have a rostrum or proboscis. * Cephalopod molluscs have hard beak-like mouthparts referred to as the rostrum. File:Washington DC Zoo - Macrobrachium rosenbergii 6.jpg, Crustacean: the rostrum of the shrimp '' Macrobrachium rosenbergii'' is serrated along both edges. File:Gminatus australis with Beetle.jpg, Insect: assassin bug piercing its prey with its rostrum File:Architeuthis beak.jpg, Cephal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Point Conception
Point Conception (Chumash: ''Humqaq'') is a headland along the Gaviota Coast in southwestern Santa Barbara County, California. It is the point where the Santa Barbara Channel meets the Pacific Ocean, and as the corner between the mostly north-south trending portion of coast to the north and the east-west trending part of the coast near Santa Barbara, it makes a natural division between Southern and Central California, and is commonly used as such in regional weather forecasts. The Point Conception Lighthouse is at its tip. Toponymy Point Conception was named ''Cabo de Galera'' by Spanish maritime explorer Juan Rodriguez Cabrillo in 1542. In 1602, Sebastian Vizcaíno sailed past again, renaming the protruding headland ''Punta de la Limpia Concepción'' ("Point of the Immaculate Conception"). Vizcaíno's name stuck, and was later anglicized to today's version. Chumash beliefs The Chumash people of the region have traditionally known Point Conception as the "Western Gate", t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleutian Islands
The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a chain of 14 large volcanic islands and 55 smaller islands. Most of the Aleutian Islands belong to the U.S. state of Alaska, but some belong to the Russian federal subject of Kamchatka Krai. They form part of the Aleutian Arc in the Northern Pacific Ocean, occupying a land area of 6,821 sq mi (17,666 km2) and extending about westward from the Alaska Peninsula toward the Kamchatka Peninsula in Russia, and act as a border between the Bering Sea to the north and the Pacific Ocean to the south. Crossing longitude 180°, at which point east and west longitude end, the archipelago contains both the westernmost part of the United States by longitude ( Amatignak Island) and the easternmost by longitude ( Semisopochnoi Island). The westernmost U.S. islan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., it borders the Canadian province of British Columbia and the Yukon territory to the east; it also shares a maritime border with the Russian Federation's Chukotka Autonomous Okrug to the west, just across the Bering Strait. To the north are the Chukchi and Beaufort Seas of the Arctic Ocean, while the Pacific Ocean lies to the south and southwest. Alaska is by far the largest U.S. state by area, comprising more total area than the next three largest states (Texas, California, and Montana) combined. It represents the seventh-largest subnational division in the world. It is the third-least populous and the most sparsely populated state, but by far the continent's most populous territory located mostly north of the 60th parallel, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sequim, Washington
Sequim ( ) is a city in Clallam County, Washington, United States. It is located along the Dungeness River near the base of the Olympic Mountains. The 2010 census counted a population of 6,606. Sequim lies within the rain shadow of the Olympic Mountains and receives, on average, less than of rain per year – about the same as Los Angeles, California – giving rise to the region's local nickname of ''Sunny Sequim''. However, the city is relatively close to some of the wettest temperate rainforests of the contiguous United States. This climate anomaly is sometimes called the "Blue Hole of Sequim". Fogs and cool breezes from the Juan de Fuca Strait make Sequim's climate more humid than would be expected from the low average rate of annual precipitation. Some places have surprisingly luxuriant forests, dominated by Douglas-fir and western red cedar. Other trees growing in the area include black cottonwood, red alder, bigleaf maple, Pacific madrone, lodgepole pine and Garry oa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dungeness, Washington
Dungeness is an unincorporated community in Clallam County, Washington, United States, located north of Sequim and on the Strait of Juan de Fuca. Dungeness has a number of waterfront residential communities, but also features the Dungeness Spit, a popular destination for locals and tourists. The name "Dungeness" refers to the Dungeness headland in England. It was given by George Vancouver in 1792, who wrote: "The low sandy point of land, which from its great resemblance to Dungeness in the English Channel, It is called New Dungeness." Dungeness crab get their name from the area, where the first commercial fishing was done for the species. The Dungeness crab fishery began in 1848 and is said to be the oldest known shellfish fishery of the North Pacific coast. Crab flourish in Dungeness Bay, and crabbing is a popular local pastime. Recreational areas in and near Dungeness include Cline Spit and the Dungeness Recreation Area and Wildlife Refuge which contain many trails. The latter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coos Bay
Coos Bay is an estuary where the Coos River enters the Pacific Ocean, the estuary is approximately 12 miles long and up to two miles wide. It is the largest estuary completely within Oregon state lines. The Coos Bay watershed covers an area of about 600 square miles and is located in northern Coos County, Oregon in the United States. The Coos River, which begins in the Oregon Coast Range, enters the bay from the east. From Coos River, the bay forms a sharp loop northward before arching back to the south and out to the Pacific Ocean. Haynes Inlet enters the top of this loop. South Slough branches off from the bay directly before its entrance into the Pacific Ocean. The bay was formed when sea levels rose over 20,000 years ago at the end of the Last Glacial Maximum, flooding the mouth of the Coos River. Coos Bay is Oregon's most important coastal industrial center and international shipping port, with close ties to San Francisco, the Columbia River, Puget Sound and other major por ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carcinonemertes Errans
''Carcinonemertes errans'' is a ribbon worm in the family Carcinonemertidae. It lives in symbiosis with the Dungeness crab (''Metacarcinus magister''), consuming the crab's developing eggs. In 1980 it was implicated in the collapse of the Dungeness crab fishery in central California. Ecology The planktonic larva of the worm settles on a suitable crab host and encysts on the exoskeleton. ''Carcinonemertes errans'' is the first species in its genus to be found on a single host species. The worm has a permanent symbiotic relationship with its host crab but it is not a parasite as it does not feed directly on the crab but is instead an egg-predator. In male crabs, and in non-breeding female crabs, the worm may live in the axils of the limbs and encyst. After mating, the mature female crab stores the sperm for several months, before releasing a batch of fertilised eggs onto her abdomen, where she tucks them under the tail flap. At this stage, the ribbon worm migrates to the mass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean Larvae
Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult, in which the hard exoskeleton is shed to allow the animal to grow. The larvae of crustaceans often bear little resemblance to the adult, and there are still cases where it is not known what larvae will grow into what adults. This is especially true of crustaceans which live as benthic adults (on the sea bed), more-so than where the larvae are planktonic, and thereby easily caught. Many crustacean larvae were not immediately recognised as larvae when they were discovered, and were described as new genera and species. The names of these genera have become generalised to cover specific larval stages across wide groups of crustaceans, such as ''zoea'' and ''nauplius''. Other terms described forms which are only found in particular groups, such as the ''glaucothoe'' of hermit crabs, or the '' phyllosoma'' of sli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abdomen
The abdomen (colloquially called the belly, tummy, midriff, tucky or stomach) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The abdomen is the front part of the abdominal segment of the torso. The area occupied by the abdomen is called the abdominal cavity. In arthropods it is the posterior tagma of the body; it follows the thorax or cephalothorax. In humans, the abdomen stretches from the thorax at the thoracic diaphragm to the pelvis at the pelvic brim. The pelvic brim stretches from the lumbosacral joint (the intervertebral disc between L5 and S1) to the pubic symphysis and is the edge of the pelvic inlet. The space above this inlet and under the thoracic diaphragm is termed the abdominal cavity. The boundary of the abdominal cavity is the abdominal wall in the front and the peritoneal surface at the rear. In vertebrates, the abdomen is a large body cavity enclosed by the abdominal muscles, at front and to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Egg (biology)
An egg is an organic vessel grown by an animal to carry a possibly fertilized egg cell (a zygote) and to incubate from it an embryo within the egg until the embryo has become an animal fetus that can survive on its own, at which point the animal hatches. Most arthropods such as insects, vertebrates (excluding live-bearing mammals), and mollusks lay eggs, although some, such as scorpions, do not. Reptile eggs, bird eggs, and monotreme eggs are laid out of water and are surrounded by a protective shell, either flexible or inflexible. Eggs laid on land or in nests are usually kept within a warm and favorable temperature range while the embryo grows. When the embryo is adequately developed it hatches, i.e., breaks out of the egg's shell. Some embryos have a temporary egg tooth they use to crack, pip, or break the eggshell or covering. The largest recorded egg is from a whale shark and was in size. Whale shark eggs typically hatch within the mother. At and up to , the ost ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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