Hydroides Elegans

	Hydroides Elegans ''Hydroides elegans'' is a species of tube-forming serpulid worms. The species was first described in 1883 by William Aitcheson Haswell as ''Eupomatus elegans.'' It is a harbour fouling invasive species, in contrast with '' Hydroides norvegica'' with which it is sometimes confused. ''Hyastenus hilgendorfi'' is a species of "decorator crab" which uses other organisms to cover its body and in a study in the Suez Canal ''H. elegans'' was one of the most frequent epibionts. ''Hydroides elegans'' is well known to settle on man-made objects, and build large aggregations of calcerous tubes, and perform ''calcification Calcification is the accumulation of calcium salts in a body tissue. It normally occurs in the formation of bone, but calcium can be deposited abnormally in soft tissue,Miller, J. D. Cardiovascular calcification: Orbicular origins. ''Nature Ma ..., which often leads to difficulties in extracting fossil fuels''. Since they are an invasive species, they must require ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	William Aitcheson Haswell William Aitcheson Haswell (5 August 1854 – 24 January 1925) was a Scottish-Australian zoologist specialising in crustaceans, winner of the 1915 Clarke Medal. His zoological author abbreviation is Haswell. Taxa authored by him are given in :Taxa named by William Aitcheson Haswell and bthis query __NOTOC__ Early life Haswell was born at Gayfield House, Edinburgh, son of James Haswell, banker, and his wife Margaret, ''née'' Cranston. Haswell studied at the Edinburgh Institution and the University of Edinburgh (M.A., 1877; BSc, 1878; D.Sc., 1887) where he won seven medals, and at the conclusion of his course gained the Bell-Baxter scholarship as the most distinguished natural science student of his year. Amongst his teachers were Thomas Henry Huxley, Archibald Geikie and Charles Wyville Thomson. He qualified for the MA and BSc degrees in 1878, and immediately afterwards, for reasons of health, went on a voyage to Australia. Career Haswell arrived in Sydney in late 1878 and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Serpulid The Serpulidae are a family of sessile, tube-building annelid worms in the class Polychaeta. The members of this family differ from other sabellid tube worms in that they have a specialized operculum that blocks the entrance of their tubes when they withdraw into the tubes. In addition, serpulids secrete tubes of calcium carbonate. Serpulids are the most important biomineralizers among annelids. About 300 species in the family Serpulidae are known, all but one of which live in saline waters. The earliest serpulids are known from the Permian (Wordian to late Permian). The blood of most species of serpulid and sabellid worms contains the oxygen-binding pigment chlorocruorin. This is used to transport oxygen to the tissues. It has an affinity for carbon monoxide which is 570 times as strong as that of the haemoglobin found in human blood. Empty serpulid shells can sometimes be confused with the shells of a family of marine gastropod mollusks, the Vermetidae or worm snails. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Hydroides Norvegica ''Hydroides norvegica'' is a species of tube-forming annelid worm in the family Serpulidae. It is found on submerged rocks, shells, piles and boats in many coastal areas around the world. It is the type species of the genus '' Hydroides''. Polychaetes, or marine bristle worms, have elongated bodies divided into many segments. Each segment may bear setae (bristles) and parapodia (paddle-like appendages). Some species live freely, either swimming, crawling or burrowing, and these are known as "errant". Others live permanently in tubes, either calcareous or parchment-like, and these are known as "sedentary". Description This serpulid worm lives inside a protective calcareous tube. The worm has about one hundred segments each bearing chitinous bristles called chaetae. There are twelve to nineteen pairs of tentacles surrounding the operculum, which looks slantingly cut. The head of the worm protrudes from the tube and is surrounded by a crown of tentacles. It looks like a low, rou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Hyastenus Hilgendorfi ''Hyastenus hilgendorfi'' is a species of spider crab from the family Epialtidae, classified in the sub-family Pisinae, from the Indo-Pacific region. It has been recorded in the Suez Canal and there have been a few records in the eastern Mediterranean, making it a Lessepsian migrant. Description ''Hyastenus hilgendorfi'' has a roughly pear-shaped carapace which is convex and bearing small tubercles and a downy coat, there is a small epibranchial plug. There are prominent projections on the gastric region, heart and gut. A pair of post-gastric tubercles are close to the orbits. Six mesobranchial tubercles are sub-equal to the sides of the midline. There are two divergent rostral spines, which have a length of two-thirds of the carapace in males but are much smaller in females. The retractable eyestalks are small. The chelipeds are the same length as the carapace, the merus has nodules in its proximal portion while the claw is smooth and glabrous. The merus of the pereopods al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Calcification Calcification is the accumulation of calcium salts in a body tissue. It normally occurs in the formation of bone, but calcium can be deposited abnormally in soft tissue,Miller, J. D. Cardiovascular calcification: Orbicular origins. ''Nature Materials'' 12, 476-478 (2013). causing it to harden. Calcifications may be classified on whether there is mineral balance or not, and the location of the calcification. Calcification may also refer to the processes of normal mineral deposition in biological systems, such as the formation of stromatolites or mollusc shells (see Biomineralization). Signs and symptoms Calcification can manifest itself in many ways in the body depending on the location. In the pulpal structure of a tooth, calcification often presents asymptomatically, and is diagnosed as an incidental finding during radiographic interpretation. Individual teeth with calcified pulp will typically respond negatively to vitality testing; teeth with calcified pulp often lack sen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Serpulidae The Serpulidae are a family (biology), family of Sessility (zoology), sessile, tube worm (body plan), tube-building annelid worms in the class Polychaeta. The members of this family differ from other Sabellidae, sabellid tube worms in that they have a specialized Operculum (animal), operculum that blocks the entrance of their tubes when they withdraw into the tubes. In addition, serpulids secrete tubes of calcium carbonate. Serpulids are the most important biomineralising polychaetes, biomineralizers among annelids. About 300 species in the family Serpulidae are known, all but one of which live in saline waters. The earliest serpulids are known from the Permian (Wordian to lopingian, late Permian). The blood of most species of serpulid and sabellid worms contains the oxygen-binding pigment chlorocruorin. This is used to transport oxygen to the tissues. It has an affinity for carbon monoxide which is 570 times as strong as that of the haemoglobin found in human blood. Empty serpul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Animals Described In 1883 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 echino ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]