Phylum Porifera (sponges) 2009.pdf

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Porifera (L. pori = pore, ferre = to bear) Covered in pores leading to canal systems 1. Cellular level of organization 2. Asymmetrical or radially symmetrical 3. Choanocytes, pinacocytes and amoebocytes 4. Intracellular digestion 5. Sessile 6. Aquatic 7. Classes of Porifera Hexactinellida Glass sponges 6-rayed siliceous spicules Cells form a syncytium Syconoid or leuconoid Demospongiae Siliceous spicules not 6-rayed May have spongin Leuconoid Calcarea Calcareous spicules Asconoid, syconoid or leuconoid Class Sclerospongiae is no longer a valid Class General sponge body plan Pasted from < > Not all sponges are filter-feeders Pasted from < > Carnivorous sponge (
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