Lecture 29: Lophotrochozoa and Two Groups - Annelids and Flatworms

● Describe where the name lophotrochozoan comes, the two key features of this group, and which taxa have / do not have these features

● Explain key features of flatworms including cavities, cephalization patterns, and major groups

● Describe key features of annelids including segmentation, cavities, movement, skeleton and cetae

● Explain how annelid movement works and what a hydrostatic skeleton is

Lophotrochozoans - general introduction

● Where does the name come from?

● What are the two key traits discussed that are seen in this group?

● How are these traits used?

● Do all members of the group have the traits that led to the name of the group?

● What does the term “zoa” mean?

Flatworms

● Describe what was discussed for the following key features

○ Diversity

○ Symmetry

○ Mesoderm

○ Cavities

○ CNS and Cephalization

○ Segmentation

● Which two groups of flatworms are all animal parasites?

● Which group of flatworms has free living species

● What has happened to the biological features of many of the animal parasites?

Annelids

● Describe what was discussed for the following key features

○ Diversity

○ Symmetry

○ Mesoderm

○ Cavities

○ CNS and Cephalization

○ Segmentation

● Earthworms

○ Describe how they use segmentation in relation to their movement

○ Describe what setae are and how they use them as part of their movement

○ Describe how they use muscles as part of their movement

○ Why does it matter for their movement that water is incompressible?

○ What is a hydrostatic skeleton?

● Tubeworms

○ How do they get their energy?