Blastocoelomate / Pseudocoelomate : Cavity partially lined by mesoderm (e.g., roundworms).

Closed circulatory system with aortic arches ("hearts"). Major Groups: Polychaetes (Marine worms with parapodia) Oligochaetes (Earthworms) Hirudinea (Leeches) Module 4: Ecdysozoa (Protostome Lineage II) Phylum Nematoda (Roundworms) Body Cavity: Pseudocoelomate.

Phylum Arthropoda: Keys to Evolutionary Domination

Summary of Invertebrate Phylogeny (Evolutionary Tree Diagram) Slide 15: Q&A / Review Questions If you need to narrow down this presentation, tell me: What specific phylum or module do you want to expand upon?

Modern PPTs transcend the traditional slide deck by incorporating digital resources directly into the lecture. Here are some essential ways to update your slides: