Chapter 31 Protosome Animals

The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups: Lophotrochozoa and Ecdysozoa. What does this finding suggest?

The common ancestor of the protostomes had a coelom. What does this suggest?

The presence of a lophophore in a newly discovered species would suggest that the species

Which one of the following is a lophotrochozoan?

Nematodes and arthropods both _____.

Adaptations to terrestrial environments evolved independently in arthropods, mollusks, nematodes, and annelids. What logical conclusion would you make from this statement?

More closely related to a flatworm than a roundworm?

A lophotrochozoan

Which one of these mollusk groups can be classified as suspension feeders?

Which mollusk group can be described as having several calcium carbonate plates along their dorsal side?

What would be the best anatomical feature to look for to distinguish a gastropod from a chiton?

What is the only group of Mollusca that does NOT have a radula?

What else would u observe about this organism?

largest surface area

How is it a mystery animal?

A cephalopod's tentacles are modified from its

If a lung was found in a mollusk, where would it be located?

which mollusk clade includes members that undergo embryonic torsion

A terrestrial mollusk without a shell belongs to which clade?

The stingers of honeybees have a function most similar to that of _____. A) rhinophores B) dorsal plummules C) cerata D) chemoreceptors

The spiracles and tracheae of insects have a function most similar to that of _____. A) rhinophores B) dorsal plummules C) cerata. D) chemoreceptors

The antennae of insects have a function most similar to that of _____. A) rhinophores B) dorsal plummules C) cerata D) chemoreceptors

A land snail, a clam, and an octopus all share

The hemocoel

Which make this distinction

all arthropods

She should find

What is the best interpretation about the graph?

Closing spiracles would

Would have trouble

What hypothesis could you make?

On which body segment are arthropod wings attached?

Which of the following are characteristics of arthropods?

Among the invertebrate phyla, phylum Arthropoda is unique in possessing members that have

A shared derived characteristic for members of the arthropod subgroup that includes spiders would be the presence of

You find a small animal with eight legs crawling up your bedroom wall. Closer examination will probably reveal that this animal has

A terrestrial animal species is discovered with larval characteristics

The possession of two pairs of antennae is a characteristic of

Allows for identification

They are larval dragonflies, destined to undergo incomplete metamorphosis.

If the pond organisms are larvae, rather than adults, Sarah should expect them to have all of the following structures, except

Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that

What would this imply about protostome evolution

When considering the wormlike phyla which feature is most useful

Nematoda

Nematode and annelid share

Nematoda

The body cavity type for arthropods and mollusk can best be described as

What anatomical features explain this movement?