BIO153H5 Chapter Notes - Chapter 33: Pearson Education, Chaeta, Sipuncula
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Lecture outline: an overview of protostome evolution, protostomes are the most abundant animals on earth. (fig. 33. 1: protostomes can be divided into lophotrochozoa and ecdysozoa. (fig. 33. 2: what is a lophotrochozoan? annelids, and flatworms, the lophotrochozoa comprise 13 phyla and include the mollusks, the lophotrochozoa lack a distinct synapomorphy but many have, a feeding structure called a lophophore (in three phyla) (fig. 33. 5a: arthropods have segmented bodies divided into sections called tagmata (singular: tagma). 33. 6a: priapulids have a tooth-lined throat that they can turn inside out to grab their prey. (fig. 33. 6b: nemerteans are active predators that move around the ocean floor and spear their prey with a proboscis. (fig. 33. 6c: the water-to-land transition, evidence for multiple transitions, phylogenetic analysis indicates that the ability to live in terrestrial environments evolved independently in arthropods (at least twice), mollusks, roundworms, and annelids. (fig.
