Exam 11: Annelids and Allied Taxa

In the annelids,each internal compartment is lined with _________.

Class Errantia is a _____________ taxon because ancestral oligochaetes arose from the polychaete clade.

The annelids,molluscs,and arthropods are considered members of Protostomia.

Errantia have more highly developed sense organs than earthworms.

The cells surrounding the intestine in the earthworm that function in excretion and in synthesizing glycogen and fats are the ______________ cells.

The Errantia generally have a less well-developed head than other annelids.

Movement in annelids involves

Small burrowing marine worms with an eversible introvert (no spines)belong to the __________.

Annelids grow by producing new segments at the anterior end.

The leeches are unique in that they have both an anterior and a posterior ___________.

_______________ is called the "fat innkeeper" because it has many commensals living in its burrow.

Clam worms and fanworms are members of the class Errantia.

Until recently,the Annelida are a well-accepted _________________ group.

Except in the leeches,the annelid coelom is filled with fluid and serves as a hydrostatic skeleton.

The organs of excretion in the earthworm are ___________.

Members of the ____________ usually have a flattened proboscis that cannot be retracted into the trunk.

The paired appendages used for locomotion in polychaetes are called _______________.

The larva of polychaetes is

When earthworms mate,the ______________ secretes mucus to hold them together.

Leeches are found predominantly in freshwater habitats,but some are marine and a few are terrestrial.