Exam 27: Animals

Which phylum includes members that have, at some point during their development, a hollow dorsal nerve cord?

Which of the following describes the postembryonic development, called complete metamorphosis, in members of the order Diptera (flies)?

Which Ecdysozoa phylum contains the 65 species of velvet worms?

Which of the following distinguish gnathostomes from other chordate lineages?

For most protostomes, what is the developmental origin of the body cavity between the gut and muscles of the body wall?

Which structure is derived from an ancestral air-breathing lung in ray-finned fishes, and is used to increase buoyancy?

According to the fossil record, which of these jawed fishes diversified in the Devonian and Carboniferous periods, but left no direct descendants?

Suppose that you have found an animal enclosed within two shells hinged together with elastic ligament. What class does this animal most likely belong to?

Which class includes the fleshy-finned fishes, which have fins supported by muscles and an internal bony skeleton?

Match each group of organisms with its lineage. Each lineage will be used only once. -sharks, skates, and rays

Which animal taxon is named for the cuticle or external skeleton that its members secrete and periodically moult?

Which subphylum includes members that are now all extinct, but that were once extremely numerous in shallow Paleozoic seas?

In some amniotes, which of the following is a waste product of nitrogen metabolism that is low enough in toxicity that it can be excreted as a semisolid paste, thus reducing water loss?

Match each phylum with its corresponding organism. Each phylum is used only once. -bristle worms, earthworms, and leeches

For most animal embryos, what is the name of the initial opening between the developing gut and the outside environment?

What is the reason that cephalopods have a closed circulatory system?

Which of the following is NOT a characteristic of turtles?

Match each phylum with its corresponding organism. Each phylum is used only once. -roundworms

What forms the skeleton of invertebrate chordates?

For most metazoans, what is the name of the outermost tissue layer during development?