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Topic: Hydra (genus)

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	Hydra (genus) - Wikipedia, the free encyclopedia
		Hydra is a genus of simple, fresh-water animals possessing radial symmetry.
		Hydras are small animals with a body length ranging from 1 mm to 20 mm when fully extended.
		Hydra may also move by amoeboid motion of their base, or by simply detaching from the substrate and floating in the current.
	en.wikipedia.org /wiki/Hydra_(genus) (951 words)

	Hydra
		Hydra (the sea monster) is the largest of the 88 modern constellations, and was also one of the 48 constellations listed by Ptolemy.
		Hydra is one of the Saronic Islands[?] in Greece.
		Hydra is the name of a genus of simple fresh-water polyp, of the class Hydrozoa[?].
	www.ebroadcast.com.au /lookup/encyclopedia/hy/Hydra_(constellation).html (95 words)

	Hydra
		Hydra live attached to vegetation by the base of the tubular body or column, with their tentacles suspended free in the water.
		Hydra will only rarely be spotted in their natural habitats, but if samples of aquatic vegetation are transferred to a clear glass or plastic container, they will often be found in considerable numbers.
		Hydra (Chlorohydra) viridissima (green hydra) is a bright green species, owing to the presence of numerous algae called zoochlorellae, which live as symbionts within the endodermal cells.The zoochlorellae carry out photosynthesis and produce sugars that are used by the hydra.
	www.northern.edu /natsource/INVERT1/Hydra1.htm (1991 words)

	Hydra
		Hydra are commonly found hanging inconspicuously from vegetation or from the water's surface film in most streams, lakes, and ponds.
		With prey almost as large as itself, the hydra stretches so thin in getting its digestive gut around it that the prey animal appears to be covered with a thin transparent film; only the tentacles tell you that you are looking at a hydra, although they generally keep their tentacles coiled up.
		Most hydra are about 0.25 to 2.5 cm long and are fully capable of moving from place to place and are often seen free-swimming (floating) on the water surface in the aquarium.
	members.optushome.com.au /chelmon/Hydra.htm (1617 words)

	Brown hydra - Hydra oligactis: More Information - ARKive
		Hydras are freshwater animals that belong to the same group as jellyfish, corals and sea anemones (2).
		This hydra is found in freshwater ponds, brooks, rivers, and streams as well as at the edges of lakes, and typically attaches to aquatic plants, stones, twigs and debris (3).
		The brown hydra, although largely a sessile species is capable of moving by gliding along on the 'basal disc', the part of the body that attaches to the substrate.
	www.arkive.org /species/ARK/invertebrates_terrestrial_and_freshwater/Hydra_oligactis/more_info.html (511 words)

	Departmental website: Indiana University South Bend
		Hydra is a genus of animals that are freshwater relatives of corals and sea anemones and are widespread in lakes and ponds throughout the world.
		Hydra is a genus of freshwater animals found in lakes and ponds throughout temperate regions of the world.
		Due to the recent increase in the utilization of hydra as research models, it is apparent that a quick and accurate method for the identification of hydra species is essential for further hydra research in the fields of population genetics, ecology, developmental and molecular biology.
	www.iusb.edu /~smart/rizksample.shtml (1879 words)

	Micscape - Microscopy Article: Hydra
		The regenerative powers of hydra are quite remarkable, a single hydra may be cut into many pieces and provided that each piece contains a portion of the two body layers, ectoderm and endoderm, it will develop into a complete animal.
		The green colour of Chlorohydra viridissima is due to the presence of small alga of the genus Chlorella which live within the body of the hydra.
		Hydra can be found attached to water-plants, stones etc., with its cylindrical body hanging downwards, with the tentacles gently moving.
	www.microscopy-uk.org.uk /mag/articles/hydra.html (537 words)

	The Probert Encyclopaedia - Animals And Plants (H)
		The harp-shell is a genus of molluscs (Harpa) belonging to the gasteropoda and to the whelk family.
		Helamys is a genus of rodents allied to the jerboas.
		Helictis is a genus of carnivorous quadrupeds allied to the skunk.
	www.fas.org /news/reference/probert/B5.HTM (3791 words)

	Cnidaria, Laboratory Notes for BIO 1003 (Site not responding. Last check: 2007-10-22)
		Hydra whole mount (it's thick—no high power) allows you to see the same features as in the living specimens; it is possible to see the bumps on the surface of the tentacles that indicate the presence of cnidoblasts.
		Hydra longitudinal section, reveals the ectoderm covering the outside and endoderm or gastroderm on the inside facing the empty tube of the gastrovascular cavity.
		This genus is a hydrozoan that exhibits alternation of generations—attached polyp and free-swimming medusa.
	darwin.baruch.cuny.edu /bio1003/cnidaria.html (870 words)

	HYDROMEDUSAE - LoveToKnow Article on HYDROMEDUSAE (Site not responding. Last check: 2007-10-22)
		by tangential division of the cells of the blastoderm, as in Geryonia, or by a mixture of immigration and delamination, as in Hydra, Tubularia, andc.
		Hydra must, in short, be a living representative of the ancestor of which the actinula-stage is a transient reminiscence in the development of higher forms.
		In Hydra viridis the polyp is of a green color and produces a spherical egg with a smooth shell which is dropped into the mud.
	56.1911encyclopedia.org /H/HY/HYDROMEDUSAE.htm (18495 words)

	AllRefer.com - hydra, in zoology (Zoology: Invertebrates) - Encyclopedia (Site not responding. Last check: 2007-10-22)
		Hydras are widely distributed in lakes, ponds, and sluggish streams.
		Hydras reproduce asexually by budding and sexually by means of gonadal cells formed on the sides of the body.
		Hydras are classified in the phylum Cnidaria, class Hydrazoa.
	reference.allrefer.com /encyclopedia/H/hydra.html (286 words)

	green hydra
		Hydras are tiny animals, which are closely related to jellyfish.
		Green Hydras use a sticky body fluid at their base to attach to an object in a place where there is a lot of food swimming by.
		The population (amount of hydras in one place at one time) is at its greatest in late Spring and early Summer.
	www.fcps.k12.va.us /StratfordLandingES/Ecology/mpages/green_hydra.htm (394 words)

	Andrew Skolnick - Science and Medical Journalist - Smithsonian Hydra Article
		Hydras are commonly found hanging inconspicuously from vegetation or from the water's surface film in most streams, lakes, and ponds.
		Tentacles curled, a hydra is ingesting its prey.
		In a manner of speaking, the hydra is as immortal an unaging as was its mythological namesake.
	www.aaskolnick.com /hydra.htm (1585 words)

	Hydra -- Britannica Student Encyclopedia (Site not responding. Last check: 2007-10-22)
		Hydra (known as the water snake) is the largest constellation, stretching about 100 degrees from Cancer in the west to Libra in the east and occupying 1,303 square degrees.
		The destruction of Hydra was one of the 12 Labours of Heracles, which he accomplished with the assistance of Iolaus.
		Among the coelenterates are the corals, hydras, jellyfishes, and sea anemones.
	www.britannica.com /ebi/article-9341206 (747 words)

	Hydra
		Hydra is a polyp from the Genus Hydrozoa, which attaches itself to plants(also under duckweed!), stones or the side of an aquarium.
		Budding is when a smaller hydra grows off the body of the adult, separates, and attaches itself to a new location.
		Hydra are usually introduced with live food caught from pools.A few hydra are easily overlooked when introduced in an aquarium In the normal community tank they pose no threat, but in a breeding tank they can rapidly deplete all newly hatched fish.
	aquaworld.netfirms.com /Predators/hydra.htm (254 words)

	Draco
		Hydras never grow longer than fort feet from heads to tail, and are armored with small hard scales.
		The Hydra is no more in the Sixth World, undoubtably hunted to extinction by the dragons of the time, apparently only the Hydra-Wyrm remains in the Sixth World.
		The Hydra-Wyrm is a mystery due to it's aquatic nature (which the Hydra lacked), the two extra heads and because of its common lack of parabiological powers.
	ancientfiles.dumpshock.com /Draco.htm (3650 words)

	Pond Life Digital Video Gallery
		Hydra -In a phylum dominated by marine species as diverse as the jellyfishes and corals, the hydra (class Hydrazoa) are among the few commonly observed coelenterates in freshwater ecosystems.
		With some species large enough to be observed without the aid of a microscope, these protozoans can reduce their body sizes to 25 percent of their normal lengths in less than 8 milliseconds, using very strong myonemes.
		Collotheca - Rotifers in the genus Collotheca are sessile and may form spherical colonies or attach singly to the substrate or to submerged aquatic plants, using a stout foot terminated by a short peduncle.
	www.olympusmicro.com /micd/galleries/moviegallery/pondscum.html (1417 words)

	SYMBIOSIS
		Hydra have a symbiotic association with another type of algae that will be discussed briefly.
		Hydra have a symbiotic relationship with a green algae of the genus Chlorella.
		Hydra are able to pass Chlorella onto their offspring when they divide so that every individual in the animal population contains algal cells (Ahmadjian 136).
	ag.arizona.edu /azaqua/algaeclass/symbios.htm (1720 words)

	Sofia D. Stepanjants, Boris A. Anokhin & Valentina G. Kuznetsova. Hydrida composition and place in the system of ... (Site not responding. Last check: 2007-10-22)
		Hydra species have been reared in the laboratory culture by the procedure described elsewhere (Anokhin et al., 1998).
		Although the majority of the present taxonomists include the only genus Hydra in the family Hydridae, in the Russian literature the genera Pelmatohydra and Chlorohydra are sometimes considered as the valid ones (Naumov, 1960; Babitsky, 1995).
		Hydra fauna of Leningrad Region and adjacent territory: taxonomy with the karyological analysis.
	www.zin.ru /annrep/2000/25.html (1622 words)

	Hydra; The hydra is one of a few freshwater cnadarians
		Hydra: any of a group (as genus Hydra) of small-bodied, freshwater polyps with a tubelike body and a mouth surrounded by tentacles.
		The hydra is one of a few freshwater cnadarians, the bulk of which are marine.
		Hydras stinging cells cannot be used again but are replaced by new ones migrating in from other parts of the body.
	www.planet-pets.com /plnthydr.htm (548 words)

	Marine Phyla Pages
		The members of one hydrozoan genus in particular, Hydractinia, form dense crusts on shells occupied by hermit crabs, and apparently defend the crab from predators.
		Hydra never goes through a medusoid stage, and spends its entire life as a polyp.
		However, Hydra is not typical of the Hydrozoa as a whole.
	kingfish.coastal.edu /marine/302/phyla/hydrozoa.htm (216 words)

	Phyla Cnidaria, Platyhelminthes, and Nematoda
		Hydra are typically 1 to 4 centimeters long, ranging in color from light tan to brown.
		The sting of a hydra is too mild to be dangerous for humans.
		Hydra are normally sessile, attached by the basal disk to some object.
	www.cbv.ns.ca /mchs/diversity/roundworm1.htm (1022 words)

	Lower Animals
		Hydra, for example, will periodically develop lumps on the sides of their bodies that are either testes or ovaries.
		Hydra also reproduce asexually by a process known as budding in which a new, small Hydra begins to grow from the side of a large Hydra, eventually pinching off when it is fully formed.
		Genus Schistosoma is a parasite whose life cycle involves both humans and snails, hence the caution not to wade in water in tropical areas where this fluke occurs.
	biology.clc.uc.edu /courses/bio106/inverts.htm (3059 words)

	Search Results for mesoglea - Encyclopædia Britannica
		Cnidarians have two main body forms, the cylindrical tentacled polyp exemplified by the hydra and the sea anemone, and the...
		genus of tubular branched sponges of the class Calcispongiae (phylum Porifera).
		A sphere represents the smallest possible ratio of surface area to volume; modifications in architecture, reduction of metabolic rate, or both may be exploited to allow size increase.
	www.britannica.com /search?query=mesoglea&submit=Find&source=MWTAB (301 words)

	INTRODUCTION
		Hydra derived its name from the resemblance of the fiber cable to the fresh water polyp of the genus Hydra.
		As Hercules required planning and perseverance in conquering the mythical monster Hydra, so should users of the Hydra instrument likewise take the time and effort to carefully plan their strategy and be well prepared for the observing process.
		In that manner, Hydra shall not be a foe, but rather a friend, capable of providing a wealth of valuable astronomical data.
	www.noao.edu /wiyn/hydra/node6.html (122 words)

	hydras - definition by dict.die.net (Site not responding. Last check: 2007-10-22)
		Note: The body is a simple tube, having a mouth at one extremity, surrounded by a circle of tentacles with which it captures its prey.
		Young hydras bud out from the sides of the older ones, but soon become detached and are then like their parent.
		Hydras are remarkable for their power of repairing injuries; for if the body be divided in pieces, each piece will grow into a complete hydra, to which fact the name alludes.
	dict.die.net /hydras (177 words)

	hydra on Encyclopedia.com
		HYDRA [hydra], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals.
		HYDRA DEVELOPMENT: Hydra ushers in the era of the e-project.
		Hydra partners with Inkra Networks to revolutionise enterpreise data centre economics and operations.
	www.encyclopedia.com /html/h1/hydra.asp (816 words)

	Animal Nomenclature (Site not responding. Last check: 2007-10-22)
		In rare cases, the scientific name for genus and the common name for an organism are the same.
		When the particular genus is not identified, the name should be written lower case and not italicized -- hydra.
		The genus name may be abbreviated to its first letter after it has been printed in full earlier in the same document.
	www.cals.ncsu.edu:8050 /course/zo150/mozley/nomencla.html (1373 words)

	hydra (zoology)
		The body is a double-layered tube (with six to ten hollow tentacles around the mouth), 1.25 cm/0.5 in long when extended, but capable of contracting to a small knob.
		Usually fixed to waterweed, hydras feed on minute animals that are caught and paralysed by stinging cells on the tentacles.
		Hydras reproduce asexually in the summer and sexually in the winter.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0008327.html (146 words)

	HYDRAS AND JELLYFISH - LAKE ERIE- CENTRAL BASIN - AVON POINT
		The picture below is of the hydranth of another type of hydra that lives on the reef, the colonial hydra, Cordylophora lacrustris.
		The tentacles of these animals are not as long as those of the hydra and all of the hydranths are joined together at their base by a tube known as the hydrorhiza.
		It was not found living on the rocks surface but rather it had attached itself to some organic matter living on the underside of a rock.
	home.centurytel.net /lakeerieecosystem/hydras.html (480 words)

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