Exam 31: Animal Phylogeny, Acoelomates, and Protostomes

A Malpighian tubule is a(n) ____.

Many arthropods are equipped with a highly organized central nervous system.

Members of the ____ Lophotrochozoan phylum are acoelomate, dorsoventrally flattened, and do not have circulatory or respiratory systems.

Animals that lack a body cavity to separate the gut from the muscles of the body wall are referred to as ____.

Members of the ____ Lophotrochozoan phylum have highly segmented bodies, with many repeating units that are usually separated by transverse partitions called septa.

The molting process exhibited in animals such as nematodes and arthropods is referred to as ecdysis.

In most eumetazoans, the innermost tissue layer during development is the ____.

Most mollusks have a closed circulatory system in which hemolymph is confined within the walls of hearts and vessels.

Ctenophores capture their food with feeding tentacles.

Which life history patterns in some rotifers are adapted to living in small bodies of water?

Members of the ____ lineage are highly active, have a closed circulatory system, and a high oxygen requirement.

Found mostly in marine environments, members of the ____ flatworm lineage are free-living, and acquire food with a muscular pharynx; most are hermaphroditic.

Adult members of the ____ Cnidarian lineage, including jellyfishes, are predominately medusae and are not active swimmers.

The organism Caenorhabditis elegans , a member of the ____ phylum, is an important model organism for studies of the genetic control of development.

All animals are eukaryotic, multicellular organisms with cell walls surrounding their cells.

Which embryonic cell layer develops into the lining of the gut in most eumetazoans?

Found mostly in marine environments, members of the ____ Lophotrochozoan phylum have a muscular, mucus-covered proboscis that they can turn inside out to capture prey.

The two phyla of soft-bodied organisms, Cnidaria and Ctenophora, have bilateral symmetry and tissues.