1500_3_Sponges - Sponge development What makes sponges...

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BIO1500 W07 Sponges [Porifera] Sponges [Porifera] are considered the oldest phylum of the kingdom Animalia Fig. 31.1
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Key characteristics of spongy species: 3-layered multicellular bodies Fig. 32.5 Outer layer: Epithelial wall cells Pore cells Spicule forming cells in some species Middle layer: Amoebocytes Inner layer: Choanocytes Key characteristics of spongy species: Choanocytes form a plankton filter feeding epithelium Fig. 32.5
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Choanocytes document the relationship of the animal kingdom to choanoflagellid protists Choanoflagellid Collar Flagellum Key characteristics of spongy species: protein body skeleton Fig. 32.5 Filling materia of epithelial interspace: Mesohyl = protein matrix Sponge skeleton components: Spongin = specialized protein forming stabilizing fibres Commercial sponges are cleaned up spongin scaffolds
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http://www.natural-sponge.jp/ Sponge commercial Reproduction in sponges: Asexual - by fragmentation or by budding Sexual - by production of sperm and eggs at random sites (no specialized gonadal tissue). A free-swimming larva settles down on a suitable substrate and start transformation into adults.
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Unformatted text preview: Sponge development What makes sponges animals? Volvox True multicellularity: differentation of multiple cell types Protist species by contrast achieved functional diversification by evolution of spezialized cell organelles. Multicellular algae still contain of only one cell type. Characteristics that separate sponges from the rest of the animal kingdom: Fig. 32.5 ! Lack of true tissues and organs. ! Lack body symmetry (asymmetrical organisms). Sponge diversity Sponge diversity ! ~5000 species ! 150 freshwater, rest marine ! Size range from mm to 2m ! Many species colonial (reefs) Sponge diversity Operculum Tube sponge Sponge diversity Barrel sponge on coral reef Sponge diversity Operculum Sponge diversity Sponge taxonomy Widely accepted classes: ! Bony sponges (Calcarea) ! Glass sponges (Hexactenellida) ! Spongin containing sponges (Demospongiae, represent 90% of all modern sponges). Debated classes: ! Coralline sponges (Sclerospongiae) ! Archaeocyatha A note of caution: sponges can be spiny!...
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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1500_3_Sponges - Sponge development What makes sponges...

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