Invertebrate Zoology Lecture Notes Ppt New

Protects against physical damage and dehydration. Requires molting (ecdysis) to allow body growth.

Exoskeleton, segmented bodies, and jointed appendages.

Gills (crustaceans), tracheal systems (insects), book lungs (arachnids). Subphyla Breakdown:

Exoskeleton: Made of chitin; provides protection and prevents desiccation. invertebrate zoology lecture notes ppt new

Mollusks are highly successful, coelomate protostomes that share a highly adaptable, unified body blueprint.

The Lophotrochozoa represent a massive protostome clade defined largely by molecular data, though many members share either a lophophore feeding apparatus or a trochophore larval stage.

Excretion: in terrestrial forms actively conserve water by precipitating uric acid or guanine into the hindgut. Protects against physical damage and dehydration

Many species alternate between a Polyp (sessile, asexual) and Medusa (mobile, sexual) stage.

invertebrate zoology lecture notes and presentations (PPT) typically review the of animals without a backbone, which comprise approximately 97% of all animal species . Core Review Concepts

Choanocytes (Collar Cells): Flagellated cells that generate water currents and trap food. asexual) and Medusa (mobile

Found in unicellular protists. All life functions occur within a single plasma membrane.

No body cavity. The space between the ectoderm and endoderm is packed with solid mesermal parenchyma tissue. (Example: Platyhelminthes).

By the end of this lecture, you will be able to:

Secondary pentaradial symmetry (larvae are bilateral, adults are 5-part radial).

Digestive Tract: Complete "tube-within-a-tube" system with a muscular pharynx to pump food against internal pressure.