Exam 27: Animals

Which flatworms are parasites of vertebrates and have a head modified into a scolex with hooks and suckers for attaching to places such as the intestinal wall of hosts?

Match each group of organisms with its lineage. Each lineage will be used only once. -turtles

What helps maintain a constant flow of water through sponges?

Which flatworms are free living and are found mostly in marine environments?

Suppose that you found an animal that is dorsoventrally flattened and lacking circulatory system?

Which lineage of echinoderms is made up of about 2000 species of brittle stars and basket stars, each with elongated, slender, somewhat snakelike arms surrounding a well-defined central disk?

Consider the ringlike patterns on an earthworm and "six-pack abs" in humans. In an animal's body plan, what are they both evidence of?

Which subphylum includes members that have a three-part body plan that comprises a head, a thorax, and an abdomen?

Match each phylum with its corresponding organism. Each phylum is used only once. -chitons, snails, slugs, and scallops

Which term refers to animals that have a fluid-filled cavity that separates the gut from the muscles of the body wall and which is completely lined by the peritoneum?

Which Lophotrochozoa phylum contains the most species, with about 100 000 described living species?