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9 Cards in this Set
- Front
- Back
Subkingdom: Parazoa
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"next to animals"
Phylum: Porifera (sponges) |
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Phylum: Porifera
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Sponges
No distinct tissues, germ layers, or gut Asymmetrical or radial symmetry Several types of cells (mobile or totipotent) Sessile suspension feeders with intracellular digestion Derived from flagellated protozoan |
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Porifera: Epidermal layer
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The thin group of cells covering the exterior body surface
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Porifera: Collar-cell layer
Choanocytes |
Contain a central flagellum surrounded by a collar of microvilli
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Porifera: Spongocoel
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Large, central cavity of sponges
Water enters in through pores and exits through the osculum |
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Porifera:Osculum
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Excretory structure in the living sponge
Large opening to the outside through which the current of water exits carrying away with it the sponge's wastes |
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Subkingdom: Eumetazoa
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"True animals"
True tissues organized into germ layers Embryo that goes through a gastrula stage Phyla: Radiata and Bilateria |
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Phylum: Radiata
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Radially symmetric
Diploblastic (only 2 primary germ layers - endoderm and ectoderm) |
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Phylum: Bilateria
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Have a front and back end as well as an upside and downside
Triploblastic (3 primary germ layers - endoderm, ectoderm, mesoderm) Complete digestive tracts with separate mouth and anus Coelom |