phylum cnidaria-radiate animals
TRANSCRIPT
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
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Class Hydrozoa Hydra
C.S L.S 100X
W.M Male Female
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Class Scyphozoa
Aurelia Lifecycle
Planula 100x
Schyphistoma 100x
Strobila 100x
Ephrya 40x
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Aurelia
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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.
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