CH 31

What is a lophophore?

One trait that is shared by the Lophotrochozoa and Ecdysozoa is_____.

Which protostome phylum is distinguished by having an unsegmented body with pseudocoelm?

What is the function of the arthropod exoskeleton?

Propose an explanation for why annelids and arthropods were thought to be closely related, before phylogenetic analyses in the late 1990s.

Which of the following nested groups best describes the taxonomic context for the question of the origin of maxillipeds?

Did insects evolve from remipedes?

Why wouldn't you conclude that the aquatic state evolved multiple times in protostomes?

Lophotrochozoan phyla include _____.

What does phylogenetic evidence tell us about protostomes?

What part of the squid is homologous to the snail foot?

Where should the origin of spiral cleavage be placed on the phylogenetic tree?

Where should the origin of the ecdysozoan cuticle be placed on the phylogenetic tree?

Where should the origin of a flattened, acoelomate body plan be placed on the phylogenetic tree?

Where should the loss of spiral cleavage be placed on the phylogenetic tree?

How would you expect a snail that lives on land to be different from a snail that lives in the water?

Lophotrochozoan phyla have a lophophore, a specialized structure for _____.

The molluscan body plan is based on three major components: the foot, the visceral mass, and the _______.

Wormlike lineages of lophotrochozoans are distinguished by specialized _____.

Long before humans invented it to power aircraft, jet propulsion evolved in _____.

The signature animal morphological feature called the corona (a cluster of cilia) is found in _____.

Where should the origin of jointed appendages be placed on the phylogenetic tree?

Where should the origin of segmented limbs be placed on the phylogenetic tree?

What characterizes an ecdysozoan?

Why do crustaceans have a carapace?

How do hemimetabolous and holometabolous metamorphosis differ?