Noncoelomates

In modern phylogenetic analysis of the animals, the protostomes are divided into what two major groups based on what characteristic?

• their symmetry

• formation of a head

• their ability to molt

• the presence or absence of vertebrae

Which of the following classifications best describes a species that does not molt, possesses a coelom, and whose larval stage utilizes a trochophore?

• Ecdysozoa

• Parazoans

• Platys

• Lophotrochozoa

A chitin exoskeleton and jointed appendages are key characteristics of which phylum?

• Arthropods

• Nematoda

• Chordata

• Mollusca

All animals have which of the following characteristics?

• body symmetry

• tissues

• multicellularity

• body cavity

Which of the following cell types of a sponge possesses a flagellum?

• Choanocyte

• Gametocyte

• Epithelial

• Spicules

Spicules and sponging are found _______ of a sponge

• within the osculum

• within the mesohyl

• between the choanocytes

• outside of the epithelial cells

The larval stage of a cnidarian is known as a—

• medusa

• planulae

• polyp

• cnidocyte

Which of the following cell layers is NOT necessary to be considered a Eumetazoan?

• Ectoderm

• Endoderm

• Mesoderm

• All of the above are found in ALL Eumetazoans

Which of the following classes has an endosymbiotic relationship with a dinoflagellate?

• Anthozoa

• Cubozoa

• Hydrozoa

• Scyphozoa

Which of the following phyla possess true bilateral symmetry?

• Cnidaria

• Porifera

• Platyhelminthes

• Ctenophora