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	polyp and medusa - Encyclopedia.com
		polyp and medusa names for the two body forms, one nonmotile and one typically free swimming, found in the aquatic invertebrate phylum Cnidaria (the coelenterates).
		The polyp is a sessile, or nonmotile, organism; well-known solitary polyps are the sea anemone and the freshwater hydra.
		The medusa tends to be rounded, with a thick body wall containing much mesoglea; it swims or is carried in the current with the mouth side down and the tentacles dangling.
	www.encyclopedia.com /doc/1E1-polypNme.html (1381 words)

	Polyp - LoveToKnow 1911 (Site not responding. Last check: )
		POLYP, the name given by zoologists to the form of animal especially characteristic of the subphylum Cnidaria of the Coelentera.
		In the subdivision Anthozoa, comprising the sea-anemones and corals, the individual is always a polyp; in the Hydrozoa, however, the individual may be either a polyp or a medusa.
		We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth.
	www.1911encyclopedia.org /Polyp (793 words)

	Polyp - Wikipedia, the free encyclopedia
		In the class Anthozoa, comprising the sea-anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa.
		We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth.
		Anthozoan polyps, including the corals and sea anemones, are much more complex due to the development of a tubular stomodaeum leading inward from the mouth and a series of radial partitions called mesenteries.
	en.wikipedia.org /wiki/Polyp (778 words)

	Hydromedusae
		Polyp feeding ends (where the tentacles are located) are not protected by a chitinized cup (the theca), hence the alternative name Athecata for this order.
		Polyps, which may be solitary rather than colonial, are tiny and can produce additional polyps by asexual budding.
		Medusae are produced by a budding process, with the polyps remaining to create more medusae.
	jellieszone.com /hydromedusae.htm (999 words)

	Polyp Summary
		Hay fever (allergic rhinitis) is an irritation of the membranes of the nose by airborne particles or chemicals.
		Polyps are approximately cylindrical, elongated on the axis of the body.
		We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth.
	www.bookrags.com /Polyp (2736 words)

	Polyp - Palaeos (Site not responding. Last check: )
		In the class Anthozoa, comprising the sea-anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa.
		We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth.
		Anthozoan polyps, including the corals and sea anemones, are much more complex due to the development of a tubular stomodaeum leading inward from the mouth and a series of radial partitions called mesenteries.
	www.palaeos.org /Polyp (751 words)

	Cnidaria
		Polyps are attached to a surface (sessile); medusae are free-floating (planktonic).
		In medusae, mesoglea is thick, watery and resembles jelly.
		In polyps, it is thin and resilient because of its high fibrous protein content.
	www.thecanadianencyclopedia.com /PrinterFriendly.cfm?Params=A1ARTA0001701 (954 words)

	Obelia - Wikipedia, the free encyclopedia
		The next generation of the life cycle begins when the medusae are released from these gonozooids, producing free swimming male and female medusae velum with gonads, a mouth, and tentacles.
		The physical appearance of the male and female medusae velum, including their gonads, are indistinguishable, and the sex can only be determined by observing the inside of the gonads, which will either contain sperm or eggs.
		During the polyp stage, the mouth is situated at the top of the body, surrounded by tentacles, whereas during the medusa stage, the mouth is situated at the distal end of the main body structure.
	en.wikipedia.org /wiki/Obelia (717 words)

	polyp - Definition, Synonyms, and Reference from OnPedia.com
		polyp - a small vascular growth on the surface of a mucous membrane
		adenomatous polyp - a polyp that consists of benign neoplastic tissue derived from glandular epithelium; "adenomatous polyps are visible protrusions that can develop on the mucosal surface of the colon or rectum"
		pedunculated polyp - a polyp with a stalk or peduncle
	www.onpedia.com /dictionary/polyp (144 words)

	Polyp and Medusa: Free Encyclopedia Articles at Questia.com Online Library
		Siphonophores are hydrozoans...anatomy, it refers to the polyp and medusa stages of a single life cycle...jellyfish.
		POLYP AND MEDUSA names for the two body forms...always medusae, and some exhibit both a polyp and a medusa stage in their life cycle.
		Jellyfish of the...In this group the medusa is the prominent form and the polyp is reduced to a small...
	www.questia.com /library/encyclopedia/polyp-and-medusa.jsp?l=P&p=5 (1114 words)

	Cnidaria
		The text-book depiction of the typical cnidarian life cycle is an alternation between a medusa and a polyp (termed metagenesis), the former the sexually reproductive stage and the latter the asexual stage.
		Polyps of some taxa form a skeleton within or external to their tissues; some skeletons are mineralic (of calcium carbonate), others are organic (of chitin or another carbohydrate), and some are both.
		Ingestion of a medusa (Aegina citrea) by the nematocyst-containing ctenophore Haeckelia rubra (formerly Euchlora rubra): phylogenetic implications.
	tolweb.org /Cnidaria (2407 words)

	[No title]
		Polyps are cylindrical in shape and are generally oriented in the environment with their oral (mouth) surface directed upward and their aboral surface (opposite the mouth) attached to a substrate.
		Medusae are umbrella- or bell-shaped, are generally free-swimming, and are oriented in the environment with the oral surface directed downward and the aboral surface directed upward.
		Both polyps and medusae have a cellular mesoglea, and gonads on the medusae are gastrodermal.
	www.brown.edu /Courses/Bio_41/labcnidaria.doc (4494 words)

	Hydroids from Reunion Island and the Indian Ocean (Site not responding. Last check: )
		The medusa itself is produced by the polyp by budding (voir Asexual reproduction).
		Furthermore, adult medusae are sexually dimorphic : the umbrella is longer than it is wide in the male, while it is more or less round in the female (see opposite photographs).
		Colonies and medusae are produced by budding, the former from a primary polyp, the latter from a reproducing polyp.
	etic.univ-reunion.fr /hydroids/animaux_sarsia_reproduction.htm (1425 words)

	Reefs.org: Where Reefkeeping Begins on the Internet - Hydroids by Ronald L. Shimek October 1997 Aquarium.Net
		In the diagram of the colony, polyp and medusa, the plane of the slice is through the center of the animal.
		Polyps generally live on the bottom and are considered primitively to reproduce only asexually by budding off either new polyps or medusae.
		Medusae are primitively produced by buds off the polyp, and are pelagic, swimming with and feeding on the plankton.
	www.reefs.org /library/aquarium_net/1097/1097_2.html (4346 words)

	polyp - Search Results - MSN Encarta
		Polyp (tumor), benign or malignant tumor projecting above normal tissue surface level.
		Polyps are usually found protruding from an inner wall in the...
		polyp and medusa body structures of cnidarians, areas found, corals, Group Digestion of Hydrozoa, hydras, hydrozoans, Life Cycle of a Jellyfish...
	encarta.msn.com /polyp.html (140 words)

	[No title] (Site not responding. Last check: )
		Polyps are somewhat cylindrical, with the body wall surrounding the enteron, and an oral disc (surface on which the mouth is surrounded by tentacles).
		Mesenteries and the pharynx distinguish anthozoan polyps from hydrozoan polyps (Oliver, 1987).
		In tetrameral radial symmetry, the polyp or medusa is divided in identical quadrants.
	www.tyler.net /coop/cnidaria.html (2177 words)

	polyp and medusa — Infoplease.com
		The polyp is a sessile, or nonmotile, organism; well-known solitary polyps are the
		polyp and medusa: Reproduction - Reproduction In organisms that exhibit both forms, such as members of the cosmopolitan genus...
		polyp and medusa: Anatomy - Anatomy The two forms are similar in construction; both consist of a cylindrical body surrounding a...
	www.infoplease.com /ce6/sci/A0839602.html (278 words)

	Diversity :: Animals Fanlisting
		Polyps may be solitary, as in some types of hydras, or they may attach to other polyps to form a colony, as corals do.
		Polyps generally perform asexual reproduction by budding, in which an outgrowth from the body wall separates to form a new polyp or medusa.
		Medusae primarily reproduce sexually—they produce gametes (sex cells), and a gamete (sperm) from a male medusa fuses with a gamete (egg) from a female medusa to form a zygote.
	kandosii.net /fan/animals/animals_cnidarians.php (1126 words)

	Diversity :: Animals Fanlisting
		Polyps may be solitary, as in some types of hydras, or they may attach to other polyps to form a colony, as corals do.
		Polyps generally perform asexual reproduction by budding, in which an outgrowth from the body wall separates to form a new polyp or medusa.
		Medusae primarily reproduce sexually—they produce gametes (sex cells), and a gamete (sperm) from a male medusa fuses with a gamete (egg) from a female medusa to form a zygote.
	www.kandosii.net /fan/animals/animals_cnidarians.php (1126 words)

	Cnidaria
		The mesoglea ranges from a non-cellular, thin membrane to a thick jelly-like material lying between the epidermis and gastrodermis, and tends to be thin in polyps and thick in medusae.
		Medusae have an umbrella-shaped body with the mouth in the centre of the concave undersurface.
		The gas float is a modified medusa, and the tentacles are clusters of modified polyps.
	www.bumblebee.org /invertebrates/Cnidaria.htm (617 words)

	About corals, anemones, and their kin
		In colonial species, the polyp soon starts to bud off new polyps from the base, which generally remain attached to the original polyp and to each other by a continuous mat of living tissue.
		Polyp size varies greatly among stony corals, ranging from some with polyps around a millimeter or two in diameter to others with polyps that can exceed diameters of 30 cm (1 foot).
		Stony corals with very small polyps are often referred to as small-polyped scleractinian corals (or SPS corals for short), while larger polyped stony corals are called large-polyped scleractinian corals (or LPS corals for short).
	www.augsburg.edu /biology/aquaria/SpecialTopicsFiles/AboutCoralsAnemonesAndKin.html (1812 words)

	polyp - Search Results - MSN Encarta
		Polyp (medicine), rounded, grape-like growth of tissue or fluid projecting from a mucous membrane either with a narrow stalk or a broad base.
		The polyp form is a cylindrical creature, with the mouth and surrounding tentacles at one end.
		The medusa or jellyfish form presents an umbrella-like...
	uk.encarta.msn.com /polyp.html (133 words)

	Wonders of the Sea: Cnidarians
		They are of the phylum Cnidaria and therefore have an alternation of generations during their life cycle (this cycle alternates from a polyp to medusa stage).
		Jellyfish are Cnidarians which lack the polyp stage of the life cycle.
		The corbulae are the reproductive structures which produce the medusa stage of the hydroid.
	www.oceaninn.com /guides/cnidarians.htm (1767 words)

	Cnidarians: Structure
		A polyp is a vase-shaped body plan where the mouth is at the top surrounded by tentacles.
		Cnidarians that are a medusa shape are mobile which means they are able to move.
		Others are either a medusa or a polyp for their entire life.
	www.pmsd.org /teachers/ktallmadge/invertebrates/index_files/page0007.htm (143 words)

	Lab 15 - Asexual Reproduction
		The basic life cycle of Cnidarians is an alternation between the asexually reproducing polyp stage and the sexually reproducing medusa stage.
		Polyps produce medusae asexually, by budding, and medusae mature to produce gametes that unite and develop into another polyp.
		(Note that both the polyp and medusa stages are diploid, so this is different from the alternation of haploid and diploid generations in plants and fungi.) This basic life cycle is most evident in the class Hydrozoa, of which Obelia is a member.
	userwww.sfsu.edu /~biol240/labs/lab_15animallifecycles/pages/15asexual.html (998 words)

	Obelia at AllExperts
		The next generation of the life cycle begins when the medusae are released from these gonozooids, producing free swimming male and female medusae velum with gonads, a mouth, and tentacles.
		The physical appearance of the male and female medusae velum, including their gonads, are indistinguishable, and the sex can only be determined by observing the inside of the gonads, which will either contain sperm or eggs.
		During the polyp stage, the mouth is situated at the top of the body, surrounded by tentacles, whereas during the medusa stage, the mouth is situated at the distal end of the main body structure.
	en.allexperts.com /e/o/ob/obelia.htm (790 words)

	Marine biodiversity: Cnidarians
		There are two basic forms of individuals, the polyp and the medusa, that can alternate along the life cycle called metagenesis, comparable to the alternation of generations among plants.
		The polyp is adapted to sessile life (live attached to the substrate), while medusae are adapted to floatation and swimming.
		Most hydrozoans alternate their life between medusa and polyp forms, even though there are individuals, like Hidra which lives only as polyps, never having a medusa phase.
	www.bioaqua.net /mnp/biodiversidad/cnidarians.asp (803 words)

	Lander University \| Obelia
		Medusae are tetramerously symmetrical as are scyphomedusae and four radial canals and four tentacles are usually present.
		The polyps are colonial, thecate, and tiny but the medusae, which are low and flat, are sometimes large, up to 50 cm.
		Obelia is representative of typical hydrozoan morphology and possesses a life cycle in which polyp and medusa are of approximately equal importance.
	webs.lander.edu /rsfox/invertebrates/obelia.html (1923 words)

	RADIATES (Site not responding. Last check: )
		Medusa as adult can have a polyp as a larval stage.
		Eventually, reproductive polyps: gonangia: budding produces medusae (2mm to several cm)) which are free-swimming.
		The medusae has sensory cells, the statocysts (for equilibrium) and ocelli (light sensitive).
	faculty.weber.edu /nokazaki/animal_Biology/CNIDARIAN-student.htm (851 words)

	NHDES Watershed Management Bureau: Freshwater Jellyfish - Craspedacusta sowerbii
		It has tentacles arranged around the circular canal (the bottom of the umbrella); some of the tentacles are for locomotion (the organism is free-swimming) while others are used for feeding.
		The polyp form is sessile (in a fixed position), attached to a substrate, such as rocks, sunken tree stumps, lake bottoms, etc. The polyp is less than 2mm in length and stays at the bottom of lakes and ponds.
		Polyps are generally colonial, with two to four individuals in a colony.
	www.des.state.nh.us /WMB/JellyFish/morph.html (328 words)

	NMITA Education: Coral Systematics (Site not responding. Last check: )
		The Phylum Cnidaria contains three classes that differ depending on which phase of the life cycle, the polyp or medusa, is expressed.
		In general, the polyp form is anchored with tentacles pointing upward and the medusa form is free-floating with tentacles pointing downward.
		-- the polyp phase is dominant and the medusa is reduced or absent from the life cycle.
	eusmilia.geology.uiowa.edu /flortax.htm (141 words)

	Cnidaria
		The polyp is tubelike and is usually attached to some substrate; it may be solitary or part of a colony.
		Polyps have little mesoglea but use the water in their guts as a hydrostatic skeleton.
		Physalia is a free-floating colony of polyps and medusae specialized for feeding, defense, and reproduction.
	www.mercy.edu /faculty/knizeski/cnidaria.html (577 words)

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