Phylum Cnidaria-Radiate Animals • Tissue level of organization • 2 Germ layers • Hydrostatic Skeleton • Gastrovascular Cavity- for digestion • Polymorphism • Polyp (sessile) and Medusa (free-living) stages Class Hydrozoa 1. Lifestyle- Both polyp and medusa stages dominant 2. Reproduction- asexual by budding or sexual 3. 10 tentacles 4. Ex: Obelia, Obelia medusae, Hydra, Hydra reproductive stages Class Scyphozoa- True Jellyfish 1. Lifestyle- Solitary- Medusa-stage dominant 2. Ex: Aurelia, Aurelia lifecycle Class Anthozoa 1. Lifestyle- Polyp stage dominant 2. Gastrovascular cavity divided into mesenteries 3. Ex: Mertidium, Metridium dissection Return to original outline Return to phyla outline Class Hydrozoa Hydra C.S L.S 100X W.M Male Female Return to original outline Return to phyla outline Hydra 40X W.M Return to original outline Return to phyla outline Budding 40X Spermary Ovary 40X Return to original outline Return to phyla outline Obelia Obelia Colony 40X Return to original outline Return to phyla outline Medusae 100x Return to original outline Return to phyla outline Class Scyphozoa Aurelia Lifecycle Planula 100x Schyphistoma 100x Strobila 100x Ephrya 40x Return to original outline Return to phyla outline Aurelia Return to original outline Return to phyla outline Class Anthozoa Metridium LS CS Dissection scope Return to original outline Return to phyla outline Metridium Return to original outline Return to phyla outline Phylum Porifera-The Sponges • Multicellular • Cellular level of organization • No division of labor among cells • No body systems, no organs, no mouth/digestive tract • No germ layers • Pores and canal systems Class Calcarea 1. Spicule type- calcium carbonate 2. Canal system- asconoid, leuconoid and syconoid 3. Marine 4. Ex: Grantia (a.k.a Sycon), Grantia spicules Class Hexactinellida 1. Spicule type- siliceous 2. Canal system- syconoid or leuconoid 3. Marine 4. Ex: Euplectella (Venus’s flower basket) Class Demospongiae 1. Spicule type- Siliceous, spongin 2. Canal system- Leuconoid 3. Marine, except one family 4. Ex: Spongia, Spongilla Representative Porifera Sponge Types: Asconoid- characterized by a simple stalk-like spongocoel surrounded by a single layer of choanocytes. Choanocytes are cells that have flagella, which beat to create a current push through the spongocoel. Syconoid- a tubular body whose wall is much thicker and highly folded into a series of incurrent canals that deliver water into radial canals lined with choanocytes. Leuconoid- the most complex level of organization, that allows an increase in body size. Clusters of flagellated chambers are filled from incurrent canals and discharge their water via excurrent canals into a central osculum. Return to original outline Return to phyla outline Class Calcarea Grantia Grantia 100x 100x Return to original outline Return to phyla outline Grantia spicules 100x Return to original outline Return to phyla outline Class Demospongiae Spongia Spongin Tissue 100x Return to original outline Return to phyla outline Representative Porifera Syconoid Grass Sponge Return to original outline Return to phyla outline Bath sponge- Leuconoid Return to original outline Return to phyla outline .