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Urechis Caupo
''Urechis caupo'' is a species of spoon worm in the family Urechidae, commonly known as the innkeeper echiuran, the fat innkeeper worm (because the tunnels often contain other animals), the innkeeper worm, or the penis fish. It is found in shallow water on the west coast of North America, between southern Oregon and Baja California, where it forms a U-shaped burrow in the sediment and feeds on plankton using a mucus net. Description ''Urechis caupo'' is a plump, unsegmented, cylindrical pink worm growing to a length of up to , with being a more typical length. There are a pair of setae (bristles) on the ventral surface at the anterior end, and a distinctive ring of about ten setae around the anus at the posterior end. The proboscis is short. Distribution and habitat Shallow water in the northeastern Pacific Ocean is the habitat of ''U. caupo''; its range extends from southern Oregon to northern Baja California. It lives in a burrow in muddy sand in the lower intertidal and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walter Kenrick Fisher
Walter Kenrick Fisher (February 1, 1878 – November 2, 1953) was an American zoologist, evolutionary biologist, illustrator and painter. He taught in Stanford University before eventually becoming Emeritus Professor in Zoology until his retirement in 1943. Fisher was the son of ornithologist Albert Kenrick Fisher. Early life Walter K. Fisher was born on February 1, 1878 in Ossining, New York. His father was Albert Kenrick Fisher and his mother was Alwilda Fisher (''née'' Merritt). As a boy, Fisher explored the countryside around his home in the Hudson Valley, and when he was older conducted similar explorations around Washington, D. C. following his family's move to the capital. During these ventures he collected birds and plants, and he drew sketches of the skulls he collected and of the landscapes. He was a talented artist and was initially tempted to follow his artistic side, and he continued to paint and draw throughout his life, but he decided that he wanted to follow a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peristalsis
Peristalsis ( , ) is a radially symmetrical contraction and relaxation of muscles that propagate in a wave down a tube, in an anterograde direction. Peristalsis is progression of coordinated contraction of involuntary circular muscles, which is preceded by a simultaneous contraction of the longitudinal muscle and relaxation of the circular muscle in the lining of the gut. In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus before being transformed into chyme in the stomach) along the tract. The peristaltic movement comprises relaxation of circular smooth muscles, then their contraction behind the chewed material to keep it from moving backward, then longitudinal contraction to push it forward. Earthworms use a similar mechanism to drive their locomotion, and some modern machinery imitate this design. The word comes from New Latin and is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animals Described In 1928
Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinoderms and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plankton
Plankton are the diverse collection of organisms found in Hydrosphere, water (or atmosphere, air) that are unable to propel themselves against a Ocean current, current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lecudinidae
''Lecudinidae'' is a family of parasitic alveolates of the phylum Apicomplexia. Taxonomy There are about 35 genera in this family. History The family was created by Kamm in 1922. It was raised to superfamily status by Levine in 1971. Description The gamont has a truncated anterior mucron. The spherical to ovoid nucleus is located in anterior third of the body. It has a central nucleolus The nucleolus (, plural: nucleoli ) is the largest structure in the nucleus of eukaryotic cells. It is best known as the site of ribosome biogenesis, which is the synthesis of ribosomes. The nucleolus also participates in the formation of .... Syzygy is lateral and often involves multiple associations. These organisms move by gliding. References Apicomplexa families {{Apicomplexa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apicomplexan Life Cycle
Apicomplexans, a group of intracellular parasites, have life cycle stages that allow them to survive the wide variety of environments they are exposed to during their complex life cycle. Each stage in the life cycle of an apicomplexan organism is typified by a ''cellular variety'' with a distinct morphology and biochemistry. Not all apicomplexa develop all the following cellular varieties and division methods. This presentation is intended as an outline of a hypothetical generalised apicomplexan organism. Methods of asexual replication Apicomplexans (sporozoans) replicate via ways of multiple fission (also known as schizogony). These ways include , and , although the latter is sometimes referred to as schizogony, despite its general meaning. Merogony is an asexually reproductive process of apicomplexa. After infecting a host cell, a trophozoite ( see glossary below) increases in size while repeatedly replicating its nucleus and other organelles. During this process, the or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Victoria
The University of Victoria (UVic or Victoria) is a public research university located in the municipalities of Oak Bay and Saanich, British Columbia, Canada. The university traces its roots to Victoria College, the first post-secondary institution established in the province of British Columbia in 1903. It was reincorporated as the University of Victoria in 1963. UVic hosts Ocean Networks Canada's deep-water seafloor research observatories VENUS and NEPTUNE, the Pacific Institute for Climate Solutions, and two Environment Canada labs: the Canadian Center for Climate Modelling and Analysis and the Water and Climate Impacts Research Centre. The Ocean Climate Building housed at the Queenswood location is dedicated solely to ocean and climate research. The Institute of Integrated Energy Systems is a leading center for research on sustainable energy solutions and alternative energy sources. The University of Victoria is also home to Canada's first and only Indigenous Law degree p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrow Goby
The arrow goby (''Clevelandia ios'') is a species of goby native to marine and brackish waters of the Pacific coast of North America from British Columbia to Baja California. This species grows to a length of SL, though most do not exceed TL. This fish can also be found displayed in public aquaria. This species is the only known member of its genus. Description The arrow goby is a small, pale grey, translucent fish which grows to in length. It has two dorsal fins; the first is the shorter and has 4-5 spines while the dorsal fin has 15-17 soft fin rays. The anal fin is about equal in length to the second dorsal fin and has 14-17 fin rays. Like other gobies, the caudal fin is rounded and the pectoral fins form a cone which the goby uses to prop the anterior part of its body above the substrate. Its scales are minute, and the mouth extends beyond to the eye. The dorsal fins have short horizontal stripes and the body is pale brownish-grey in colour with darker mottling. Dis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scaleworm
Polynoidae is a family of marine Polychaete worms known as "scale worms" due to the scale-like elytra on the dorsal surface. Almost 900 species are currently recognised belonging to 9 subfamilies and 167 genera. They are active hunters, but generally dwell in protected environments such as under stones. The group is widely distributed from shallow intertidal waters to hadal trenches. They are the most diverse group of polychaetes in terms of genus number and second most diverse in terms of species number which is almost 8% of all segmented worm species. Description Most Polynoidae species are short and flattened, but can reach as much as 20 cm in length and 10 cm width in ''Eulagisca gigantea'' and ''Eulagisca uschakovi''. Individuals are usually covered almost entirely by elytra, which can be shed and regenerated in many species. The elytra of some species are faintly bioluminescent, and leave glowing traces around the mouthparts of their predators, making those preda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrimp
Shrimp are crustaceans (a form of shellfish) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata of the decapod order, although some crustaceans outside of this order are referred to as "shrimp". More narrow definitions may be restricted to Caridea, to smaller species of either group or to only the marine species. Under a broader definition, ''shrimp'' may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long, narrow muscular tails (abdomens), long whiskers ( antennae), and slender legs. Any small crustacean which resembles a shrimp tends to be called one. They swim forward by paddling with swimmerets on the underside of their abdomens, although their escape response is typically repeated flicks with the tail driving them backwards very quickly. Crabs and lobsters have strong walking legs, whereas shrimp have thin, fragile legs which they use primarily for perching.Rudloe & Rudloe (2009 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pea Crab
The pea crab, ''Pinnotheres pisum'', is a small crab in the family Pinnotheridae that lives as a parasite in oysters, clams, mussels, and other species of bivalves. Description Pea crabs are small crustaceans about the size of a pea or dime, with a "smooth dorsal surface of the carapace, or upper exoskeleton". The exoskeleton of males is hard and circular and has eyes and antennae extending from their fronts, and the chelipeds are more robust in males than in females, which have more elongated chelipeds. The bodies of the female pea crabs are often translucent and show the inner organs and gonads as yellow and red, with the males being a "more yellowish-grey with patches of brown". Ecology The relationship between the pea crab and its host is one of parasitism, rather than commensalism, since the host may be harmed by the crab's feeding activities. The pea crab relies solely on its host for food, safety, and oxygen. Pea crabs have a variety of hosts, the most important of whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myidae
Myidae, common name the softshell clams, is a taxonomic family of marine bivalve molluscs in the order Myida. Genera Genera within the family Myidae include: * '' Cryptomya'' ( Conrad, 1848) **'' Cryptomya californica'' ( Conrad, 1837) – California softshell * '' Mya'' Linnaeus, 1758 **''Mya arenaria'' Linnaeus, 1758 – soft-shell clam ** ''Mya baxteri'' Coan and Scott, 1997 ** '' Mya elegans'' ( Eichwald, 1871) ** ''Mya japonica'' Jay, 1856 ** '' Mya priapus'' ( Tilesius, 1822) ** '' Mya profundior'' Grant and Gale, 1931 ** ''Mya pseudoarenaria'' Schlesch, 1931 ** '' Mya truncata'' Linnaeus, 1758 ** '' Mya uzenensis'' Nomura and Zimbo, 1937 * '' Paramya'' Conrad, 1860 ** '' Paramya subovata'' ( Conrad, 1845) * '' Platyodon'' **'' Platyodon cancellatus'' ( Conrad, 1837) – boring softshell * '' Sphenia'' Turton, 1822 ** '' Sphenia antillensis'' Dall and Simpson, 1901 ** '' Sphenia binghami'' Turton, 1822 ** '' Sphenia luticola'' (Valenciennes, 1846) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
