Marine Biology Diaz de Leon Homework #7 due: f6

Molluscs & Arthropods & Echinoderms

Vocab:

mantle radula crystalline style siphon

autotomize deuterostomes ossicles dorid

aeolid pen respiratory trees molt

exoskeleton cuticle cephalothorax cirri

abdomen maxillipeds aristotle's lantern regeneration

madreporite ampullae pedicellariae aboral

water vascular system ambulacral grooves pentamerous symmetry

1. Draw and label the anatomy of a barnacle, lobster and sea star. Use your text for help.

2. How would you know, by looking whether a crustacean found on the beach was an isopod or an amphipod? How would you know it wasn’t a shrimp?

For questions 3 -5 assume you are at the beach using a field guide to ID animals you see in the intertidal.

3. If you found an echinoid what would you assume about it’s reproductive life? It’s diet?

4. If you learned that black turban snails and limpets were “primitive” snails and unicorns and dogwinkles were “neo” snails what differences would you assume about their feeding and breeding behavior?

5. If you ID an animal as an acorn barnacle what else do you know about the animal? How is that different than other crustaceans?

Refer to your returned invert workshop for 6 &7.

6. Diagram the taxonomic relationships between the taxa on the lists. Fill in the appropriate phyla/subphyla.

7. Using your text and lecture notes redo those lists. Include all available information on anatomy, feeding, and reproduction. Select examples and particular natural history stories as you see fit. Neatly circle the material you believe is more important or interesting.

8. Why is the pentamerous radial symmetry of Echinoderms considered superficial and does not link this phylum to the one showing true radial symmetry? (which one is that?)

Why are echinoderms closer related to chordates than the other phyla we've studied? How does this relate to our previous discussion on conservative and adaptive traits and their usefulness on reconstructing phylogenetic/evolutionary relationships?