How do the Annelids fit in? unknown common ancestor Porifera Cnidaria PlatyhelminthesNemertea Nematoda Rotifera Annelida.
Soft-bodied coelomates, multicellular, bilateral symmetry Divided into three parts: head-foot- muscular organ covered in cilia and rich in mucous cells.
Segmented Worms Chapter 17. Annelids and Allied Taxa Phylum Annelida Class Polychaeta Class Oligochaeta Class Hirudinida Phylum Echiura Phylum Sipuncula.
Mollusks, Arthropods , Echinoderms
Phylum Molluscs
Mollusks
Phylum Chordata 1 Tunicates Amphioxus. Phylum Chordata 2 Included are 48,000 species the majority of which are vertebrates – 1,400 species are invertebrates.
Class Cephalopoda the squids, octopus, nautilus, and cuttlefish Richard E. Young, Michael Vecchione and Katharina M. Mangold.
Phylum Mollusca Ancestral Protist segmentation true tissue radial symmetry bilateral symmetry Deuterostomes: eucoelom Protostome: schizocoelem pseudoc.
Invertebrates
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