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Published byFrederick Rice Modified over 9 years ago
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Invertebrates Kingdom Animalia
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97% Invertebrates (lack a backbone) Examples Examples - worm, jellyfish, lobster, spiders, etc. Click on diagram to watch video…
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Patterns of Symmetry Symmetry Symmetry - Arrangement of body parts around a point or central axis. Four types Four types: Asymmetrical Asymmetrical - no definite symmetry Spherical Spherical - shaped like globes Bilateral Bilateral Radial Radial
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Radial Symmetry any Divided into halves by any plane that passes through its longitudinal axis. Example - hydra, starfish
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Bilateral Symmetry one Divided into halves by placing one specific plane through the longitudinal axis of an organism. Example - butterfly
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Terminology Cephalization - An adaptation that allows organisms’ sensory organs to enter an environment first. Specialization - An adaptation of a cell for a particular function. Anterior - front end Posterior - hind end Dorsal - top Ventral - bottom
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Patterns of Development Zygote - Embryo - Blastula - Gastrula Blastopore, or depression, is produced in the blastula stage. Gastrula stage - Formation of ectoderm, endoderm, & mesoderm
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Invertebrate Phyla - Phylum Porifera Filter feeders Non-motile(sessile) Asexual/sexual reproduction Example - Sponges
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Phylum Cnidaria Shapes - polyp, medusa, mixed colonies. Body parts - tentacles, nematocysts (stingers), gastrovascular cavity Asexual/sexual reproduction; hermaphroditic Example - Jellyfish
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More phyla... Phylum Phylum Platyhelminthes Platyhelminthes - free-living & parasitic, marine, asexual/sexual reproduction - Examples-flatworms (flukes, planaria, tapeworms) Phylum Phylum Nematoda Nematoda - free-living & parasitic; roundworms - Example-Ascaris, trichinella Phylum Phylum Rotifera Rotifera - free-swimming; feed on algae, bacteria, & protozoa - Example-Rotifers
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Phylum Annelida coelem True body cavity, or coelem. Body is segmented. Well-developed organ systems setae Most annelids have external bristles called setae.
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Earthworm Dissection
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