Question 1

Which of the following statements reflect the taxonomic status of Sipuncula and Chaetopteridae?

Accepted Answer

Chaetopteridae and Sipuncula are considered basal annelids and lie outside the two major annelid clades: Errantia and Sedentaria.

Question 2

Which of the following groups of worms are not in the phylum Annelida?

Accepted Answer

Flatworms are not in the phylum Annelida. They belong to the phylum Platyhelminthes, which is characterized by their flattened bodies and lack of a true coelom. The other options, earthworms, beard worms, spoon worms, and peanut worms all belong to the phylum Annelida.

Question 3

Reproductive patterns within the Errantia vary between taxa.Nereis and Glycera,however,do show features common to many errantians.All of the following are common to reproduction by both Nereis and Glycera except one.

Accepted Answer

Epitoky is not a common feature in the life history of both Nereis and Glycera.

Question 4

Echiura,Pognophora,and Sipuncula are all older phylum names.These animals have recently

Accepted Answer

These three phyla were previously considered separate from the Annelida, but recent molecular and morphological studies have shown that they should be included within the Annelida. Therefore, they have been added to the Annelida.

Question 5

Unlike other annelids,echiurans

Accepted Answer

Echiurans are not segmented, which distinguishes them from other annelids that typically have segmented bodies.

Question 6

Which of the following statements is true for sipunculans but not for members of the Chaetopteridae? Check all that apply.

Accepted Answer

Chaetopteridae and Sipuncula are were phylogenetic enigmas.The former has been considered a "polychaete" with uncertain affinities to other annelids.The latter has been considered a separate phylum.The features of their biology that are described in this question are discussed in section 12.5.

Quiz 12: Annelida: the Metameric Body Form