New | Invertebrate Zoology Lecture Notes Ppt

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Body Plans & Symmetry: Key to classification is whether an organism exhibits radial symmetry (useful for sessile animals to reach in all directions) or bilateral symmetry (typically associated with active movement and cephalization, the localization of a brain). invertebrate zoology lecture notes ppt new

Cnidocytes: Specialized stinging cells containing nematocysts used for prey capture and defense. Major Classes: Hydrozoa: (Hydra, Portuguese Man o' War). Scyphozoa: (True jellyfish). Anthozoa: (Sea anemones and corals—no medusa stage). 4. The Protostome Revolution: Worms and Soft Bodies You can use this guide to populate PowerPoint

• Summary: "Invertebrates are a diverse group of animals that make up about 95% of all animal species."
• Future topics: "We will explore these phyla in more detail, as well as other invertebrate groups, in future lectures."

• Asteroidea: Sea Stars; arms distinct from central disk; tube feet for predation.
• Ophiuroidea: Brittle Stars; highly flexible arms; tube feet for sensory/filter feeding.
• Echinoidea: Sea Urchins & Sand Dollars; rigid test (shell); Aristotle's Lantern (chewing apparatus).
• Crinoidea: Sea Lilies & Feather Stars; oral surface facing up; filter feeders.
• Holothuroidea: Sea Cucumbers; reduced skeleton; elongated oral-aboral axis.

Skeletal Support: Provided by spicules (calcium or silica) and spongin fibers. 3. Phylum Cnidaria: The Stingers Summary: "Invertebrates are a diverse group of animals