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Topic: Choanocyte

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Porocytes

Choanoflagellate

Parazoa

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Sponge

Heterokont

Cnidocyte

Trematoda

Cercozoa

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Life cycle

Porifera

	choanocyte - Encyclopedia.com
		choanocyte In Porifera (sponges), one of the flagellated cells surrounded by a collar-like sheath of protoplasm that form a layer lining the internal chambers.
		Transdifferentiation of larval flagellated cells to choanocytes in the metamorphosis of the demosponge Haliclona permollis.
		The ectosome is composed of a layer of flattened cells, exopinacocytes, that surround dense interwoven bundles of...
	www.encyclopedia.com /doc/1O8-choanocyte.html (609 words)

	India, Indian States, India States, Indian hotels, Indian News and Indian Tourism, India Travel
		Choanocytes (also known as "collar cells"), flagellated cells that function as the sponge\'s digestive system, are remarkably similar to the protistan choanoflagellates.
		Contractile vacuoles are found in archaeocytes and choanocytes of freshwater sponges.
		Sperm are formed from choanocytes; and oocytes derive from choanocytes in some sponges, and archaeocytes in others.
	www.haryanain.com /wiki-Sponge (2255 words)

	Sponges - EnchantedLearning.com
		Most sponges eat tiny, floating organic particles and plankton that they filter from the water the flows through their body.
		Food is collected in specialized cells called choanocytes and brought to other cells by amoebocytes.
		If a sperm is caught by another sponge's collar cells (choanocytes), fertilization of an egg by the traveling sperm takes place inside the sponge.
	www.allaboutnature.com /subjects/invertebrates/sponge (803 words)

	invert_3.html [sponges] (Site not responding. Last check: )
		A choanocyte is comprised of a cell, flagella and membrane collar.
		Exactly how the flagella works with the collar is 1) the flagella creates a current around the choanocyte, and 2) food particles stick to the collar and are ingested.
		Spiculesa re tough and sharp because they are made of silica or carbonate; they are flexible because of the presence of a protein called spongin in their structure.
	library.thinkquest.org /C006669/data/Biol/invert_3.html (219 words)

	[No title]
		The innermost tissue layer is composed of cells called choanocytes or collar cells (see S&S, p.45) which have flagella that beat to produce water currents through the sponge body.
		Movement of water through the sponge body is accomplished by the beating of the choanocyte flagella.
		Note that the body wall of syconoid sponges is thicker than that of asconoid sponges and that the syconoid spongocoel is not lined by choanocytes as is the asconoid spongocoel.
	www.brown.edu /Courses/Bio_41/labporifera.doc (2251 words)

	Feeding in a Calcareous Sponge: Particle Uptake by Pseudopodia -- Leys and Eerkes-Medrano 211 (2): 157 -- The ...
		cells (choanocytes) have an apical collar of tightly spaced,
		between choanocytes and introduced particles in the large feeding
		choanocyte apical surface up to 16 µm long were found,
	www.biolbull.org /cgi/content/abstract/211/2/157 (244 words)

	IngentaConnect Ultrastructure and embryonic development of a syconoid calcareous... (Site not responding. Last check: )
		The inner and outer layers of the chamber wall are formed by epithelia characterized by apical-basal polarity and occluding junctions between cells.
		Choanocytes, and in particular collar microvilli, varied in size and shape, depending on their location in the choanocyte chamber.
		Although some of the odd shapes of choanocytes and their collars can be explained by the development of large embryos first beneath and later on top of the choanocytes, the presence of many fused collar microvilli on choanocytes may reflect peculiarities of the hydrodynamics in large syconoid choanocyte chambers.
	www.ingentaconnect.com /content/bsc/ivb/2006/00000125/00000003/art00001 (447 words)

	Sponge @ iCookClub.com
		The collars are composed of microvilli and are used to filter particles out of the water.
		The beating of choanocyte flagella force water into the spongocoel through pores in the body wall.
		Syconoid is a modification on this type with folds in the body wall and choanocytes lining canals within these folds.
	reference.icookclub.com /sponge.html (498 words)

	Choanocyte
		The word "choanocyte" uses 10 letters: A C C E H N O O T Y.
		Words within choanocyte not shown as it has more than seven letters.
		List all words starting with choanocyte, words containing choanocyte or words ending with choanocyte
	www.morewords.com /word/choanocyte (155 words)

	Gastrulation in Calcareous Sponges: In Search of Haeckel's Gastraea -- Leys and Eerkes-Medrano 45 (2): 342 -- ...
		Choanocyte chambers radiate out from a central cavity and are
		Metamorphosis of coeloblastula performed by multipotential larval flagellated cells in the calcareous sponge Leucosolenia laxa.
		Embryogenesis and metamorphosis in a haplosclerid demosponge: Gastrulation and transdifferentiation of larval ciliated cells to choanocytes.
	icb.oxfordjournals.org /cgi/content/full/45/2/342 (5390 words)

	Porifera (sponges)
		They vary in size from a few millimetres to over two metres across.
		Their cells are structured around a system of pores, chambers and canals through which water is moved by the action of the flagellae of the choanocyte cells.
		Archaeocytes digest food particles passed from the Choanocytes, secrete spicules, spongin and collagen.
	www.bumblebee.org /invertebrates/Porifera.htm (644 words)

	Mer et littoral - La biologie des Eponges - Porifères - Spongiaires
		Les choanocytes sont des cellules munies d'une collerette et d'un flagelle.
		Dans le type Sycon, les choanocytes sont rassemblés dans de petits tubes alimentés par un réseau d'eau.
		Dans cette forme, les choanocytes sont rassemblés en chambres vibratiles.
	www.mer-littoral.org /02/poriferes-2.php (331 words)

	Columbia Encyclopedia- Porifera - AOL Research & Learn
		The middle (mesohyl) layer consists of gelatinous protein/carbohydrate material, a range of mobile cells, and a skeleton of calcareous or siliceous spicules, or of elastic proteinaceous fibers called spongin fibers.
		Food is digested in ameboid archaeocytes that pick up food vacuoles from the choanocytes, which ingest the mainly particulate food.
		In the leuconoid sponges choanocytes line the pockets formed by the convoluted body wall.
	reference.aol.com /columbia/_a/porifera/20051207015209990011 (885 words)

	Choanocytes are cells that line the interior body walls of...
		Choanocytes are cells that line the interior body walls of...
		"Choanocytes" are cells that line the interior body walls of sponges sponges that contain a central flagellum flagellum surrounded by a collar of microvilli microvilli.
		The flagellum beats regularly, creating a water flow across the microvilli which can then filter filter nutrients and other food food from the water.
	www.biodatabase.de /choanocyte (101 words)

	Biology 105 (Site not responding. Last check: )
		Choanocytes not only filter water through their collar of microvilli (thin, finger-like extensions of the cell), but also generate current for filtration with their flagella.
		Finally, leuconoid sponges do away with SA/V size limitation by packaging their choanocytes into tiny choanocyte chambers, plumbed by incurrent and excurrent canals, that can be packed throughout massive sponge bodies.
		Choanocytes in this species are not in simple radial canals, but in a more fragmented arrangement, yet they are also not in neat, small choanocyte chambers as in truly leuconoid sponges.
	www.flmnh.ufl.edu /malacology/IZ2005/LabNotes/lab2.htm (4599 words)

	IB 123(1) (Site not responding. Last check: )
		It is widely accepted that multicellular animals (metazoans) constitute a monophyletic unit, deriving from ancestral choanoflagellate-like protists that gave rise to simple choanocyte-bearing metazoans.
		However, a re-assessment of molecular and histological evidence on choanoflagellates, sponge choanocytes, and other metazoan cells reveals that the status of choanocytes as a fundamental cell type in metazoan evolution is unrealistic.
		Rather, choanocytes are specialized cells that develop from non-collared ciliated cells during sponge embryogenesis.
	www.invertebratebiology.org /ib1231.php?action=1&artno=220 (342 words)

	Was The Humble Sponge Earth's First Animal? (Site not responding. Last check: )
		Nevertheless, says Sogin, "the sponge has a lot of organization to it." In particular, it has two different types of cells, each of which plays an important role in the functioning of the whole.
		Choanocytes use these filaments, called flagella, to paddle water past themselves.
		Thousands of choanocytes beating their flagella in synchrony, like oarsmen on a Roman galley, propel a steady stream of water past the sponge's other cells, which are designed to capture and ingest the food particles the water contains.
	news.nationalgeographic.com /news/2002/04/0401_0401_shapeoflife1.html (754 words)

	Classes
		Subclass Calcaronia: free-living larvae are partly flagellated amphiblastulae; choanocyte nuclei apical; flagellum arises directly from nucleus (Br 182).
		Subclass Pharetrondia larvae and choanocyte variable; massive reinforcement of calcite added to skeleton as discrete spicules (eg.
		The position of the nucleus in the choanocyte is basal (HA 445).
	nausicaa.phys.chuo-u.ac.jp /MDS/anima97/node14.html (733 words)

	Amazon.com: "choanocyte cells": Key Phrase page (Site not responding. Last check: )
		an outer ectoderm Choanocyte cell lined by pinacocyte cells and an Radial canal Apopyle inner endoderm lined by Excurrent canal choanocyte cells and in between v e a non-cellular...
		However, virtually all feeding activity is concentrated in individual choanocyte cells, which function "raptorially.
		Virtually all feeding activity is concen- trated in individual choanocyte cells, which function "raptorially.
	amazon.com /phrase/choanocyte-cells (322 words)

	choanocyte - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "choanocyte" is defined.
		choanocyte : The American Heritage® Dictionary of the English Language [home, info]
		choanocyte : Dorland's Illustrated Medical Dictionary [home, info]
	www.onelook.com /?loc=rescb&w=choanocyte (130 words)

	Organisation of the Poriferan body
		Furthermore, in some sponges the choanoflagellates develop into gametes.
		These cells are totipotent, which means that they can change into all of the other types of sponge cells.
		The secretion of spicules is carried out by sclerocytes.
	www.ucmp.berkeley.edu /porifera/pororg.html (308 words)

	Mer et littoral - La biologie des Eponges - Spongiaires - Porifères
		La couche interne ou endoderme est couverte de choanocytes.
		Ces cellules sont munies d'un flagelle qu'elles activent pour brasser l'eau et d'une collerette qui capture la nourriture.
		Chez les éponges les plus complexes, les choanocytes sont regroupés dans des chambres remplissant la fonction de pompe, un réseau de canaux achemine l'eau en direction de ces "pompes".
	www.mer-littoral.org /02/poriferes-3.php (450 words)

	Choanocyte: Encyclopedia - Choanocyte
		Choanocytes (also known as "collar cells") are cells that line the interior body walls of sponges that contain a central flagellum surrounded by a collar of microvilli.
		It is the closest family member to the free-living ancester called chanoflagellate The flagellum beats regularly, creating a water flow across the microvilli which can then filter nutrients and other food from the water taken from the collar of the sponge.
		Please rate this article with 10 as very good and 1 as very poor.
	www.experiencefestival.com /a/Choanocyte/id/1968337 (209 words)

	Choanocyte sur l'encyclopédie Recherche.fr (Site not responding. Last check: )
		Ressources pour l'expression "Choanocyte" : 250 jeux gratuits »»
		Très proche de la cellule des flagellés (au point que ceux-ci sont appelés "choanoflagellés"), le choanocyte est un caractère dérivé propre qui détermine en partie le clade des spongiaires.
		Le contenu de cette page (Choanocyte) est un minuscule extrait de l'encyclopiédie gratuite en ligne WIKIPEDIA le webmaster de ce site n'est pas l'auteur de cet article (Choanocyte).
	www.recherche.fr /encyclopedie/Choanocyte (206 words)

	Biology of Sponges video guide.
		They have a unique type of cell not found in other animal phyla - the choanocyte, or collar cell.
		Their tissues are loosely organized, and they have no internal organs.
		Animation is used to show the similarities between choanoflagellates and the choanocytes of sponges, providing a strong visual connection to the evolutionary story.
	www.ebiomedia.com /prod/BOsponges.html (2545 words)

	SICB - 2007 meeting - Abstract Details
		Animals such as Cnidarians and Ctenophores form two germ layers, the endoderm and the ectoderm; all other Metazoa are triploblastic, also forming mesoderm.
		Gastrulation, the coordinated movement of cells to form embryonic germ layers, has been compared to the formation of choanocyte chambers in sponges; others argue choanocyte chamber formation does not truly constitute gastrulation.
		As germ layers lead to the formation of adult tissues, without gastrulation forming germ layers, sponges are not thought to form true tissues including organized epithelia layers; however, sponges appear to have number genes that encode the necessary components of organized epithelia tissue.
	www.sicb.org /meetings/2007/schedule/abstractdetails.php3?id=816 (252 words)

	Phylum Porifera (Site not responding. Last check: )
		consist of flagellated kinds known as choanocytes and amoeboid-like cells called amoebocytes.
		Choanocyte cells line the canals from paragaster to osculum and outside of the sponge.
		Choanocyte cells bring food into the sponge on currents.
	pls.atu.edu /physci/geology/people/baker/geol3124/sponges_htm.htm (1620 words)

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