Classification and phylogeny of hexactinellida porifera canadian. The tissue organization offarrea occa has been examind by light microscopy, transmission electron microscopy tem, and scanning electron microscopy sem. Hexactinellids are widely viewed as an early branch within the porifera because there are major differences between extant hexactinellids and other sponges. Demospongiae and calcarea, with the extinct class archaeocyatha. The spicules, which often form a latticework, have six points or some multiple thereof. The classification of calcarea is mainly typological and not based on.
Gland cells on gills and labial palps secrete mucus to entangle particles. The marine sponge discodermia dissoluta is a source of the polyketide. It was found to agree closely with the hexactinellid model established forrhabdocalyptus dawsoni by mackie and singla 1983 in consisting of a thin general syncytium incorporating few discrete cellular components, several of. While the spicules in most species have three points, in some species they have either two or four points. Notes on the phylum porifera sponge skeleton free 30. Siliceous spicules present andor skeleton of spongin fibres or fibrillar collagen. Tissue organization of farrea occa porifera, hexactinellida. Phylum porifera reino animalia grupo parazoa phylum porifera clase calcarea clase hexactinellida clase demospongiae 22. Pdf oogenesis, spermatogenesis, embryogenesis, and the structure of the larva of oopsacas minuta hexactinellida, hexasterophora were studied in a. Hexactinellida or triaxonida or hyalospongiaeglass sponge 3. Characterized as large openings where water comes out 4. They lack an epidermal covering, and their skeletons are composed of spicules of silica. They are sponges with a soft body that covers a hard, often massive skeleton made of calcium carbonate, either aragonite or calcite. Pdf development of sponges from the class calcarea bowerbank, 1864.
Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. They are usually classified along with other sponges in the phylum porifera, but some researchers consider them sufficiently distinct to deserve their own phylum, symplasma. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Hexactinelidos, las esponjas siliceas clase hexactinellida. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Publishing platform for digital magazines, interactive publications and online catalogs. It was found to agree closely with the hexactinellid model established forrhabdocalyptus dawsoni by mackie and singla 1983 in consisting of a thin general syncytium incorporating few discrete cellular components, several of which share. Hexactinellid sponges are sponges with a skeleton made of four andor sixpointed siliceous spicules, often referred to as glass sponges. Class bivalvia feeding suspended organic matter enters incurrent siphon. Aug 07, 2019 clase introduccion a metazoarios actualizado 1.
Demosponge included are the yellow tube sponge, aplysina fistularis, the purple vase sponge, niphates digitalis, the red encrusting sponge, spiratrella coccinea, and the gray rope sponge, callyspongia sp. Reconstructing the phylogeny of sponges porifera is one of the remaining. Pdf class hexactinellida schmidt, 1870 researchgate. The comparative embryology of sponges springerlink. Cilia and grooves on the labial palps direct the mucous mass into mouth. Phylogeny and evolution of glass sponges porifera, hexactinellida. Glass sponges are pale in color and are cup or basketshaped. Read about hexactinellida on the animal diversity web. Users can purchase an ebook on diskette or cd, but the most popular method of getting an ebook is to purchase a downloadable file of the ebook or other reading material from a web site such as barnes and noble to be read from the users computer or reading device.
Phylum porifera class calcareous sponge class hexactinellida sponge class jrmtosuptosnlnaj class sclerospongiae. This is used to produce pipe sockets by heating and forming them over a mandrel. Spicules are six pointed and have a latticelike structure cup, vase or urn shape euplectella deep sea glass sponge. Editura bioflux looking for a professional download pdf. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Pvc is known to exhibit viscoelastic behavior as it approaches its glassy transition tempe rature. Class hexactinellida glass sponges these are deepsea sponges. In particular, much of their tissues are syncitia, extensive. Pdf phylum porifera sponges are metazoans united by the unique possession of choanocyte. Ppt calcarea powerpoint presentation free to view id. Pac performancecentered adaptive curriculum for employment needs programa erasmus.
Sponges in class calcarea produce calcium carbonate spicules and no spongin. They are characterized by spicules made out of calcium carbonate in the form of calcite or aragonite. Food in mucous masses slides to food grooves at lower edge of gills. Hexactinelidos, esponjas siliceas noaa photo librarycc by 2. The animal diversity web is an educational resource written largely by and for college students. Class hexactinellida s skeletal structure is made out of what material. Dt for ed toolkit 6 the assrcl oom organization doesnt accommodate different learning modes and shifting class sizes. Currently, the sponge fauna of mexico, considering only the class demospongiae, consists of 517 species, with 174 of them endemic to mexico. The hexactinellids, or glass sponges, are characterized by siliceous spicules consisting of six rays intersecting at right angles, much like a toy jack. Basically, marine sponges consist of three sublineages such as hexactinellida, calcarea, and demospongiae. Convert documents to beautiful publications and share them worldwide. The calcareous sponges or calc sponges of class calcarea are members of the animal phylum porifera, the cellular sponges.
For the third class, hexactinellida glass spongespredominantly. Identification of sponge species food and agriculture organization. Cells responsible for the circulating of water inside the organism. What is the scientific name of the ping pong tree sponge. Give two ways in which porifera reproduce asexually. Pdf hexactinellida schmidt porifera are deepwater marine sponges defined by their production of siliceous spicules of hexactinic, triaxonic cubic. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Notes on the phylum porifera free download as powerpoint presentation. Development of the present classification scheme of the class hexactinellida was delayed because authors of the early species descriptions did not. Michael schurr, a 2nd grade teacher in new york, realized that he never asked his students what would make them comfortable in. It can be rally exciting throgh reading period of time. Adw doesnt cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Dt for ed toolkit 2 teacherdesigned how might my classroom be redesigned to better meet my students needs.