Exam 17: Annelids and Allied Taxa

Conventional external fertilization involves both males and females extruding gametes into the environment where they fertilize separate from the parents;internal fertilization involves sperm being transferred to the female with fertilization inside the female.A leech utilizes

Oligochaetes are primarily

The Branchiobdellida,is a group of small annelids that contains parasites or commensals of crayfish.They show similarities to both oligochaetes and leeches in that they bear a head sucker.In your analysis,is the evolution of a head sucker a derived trait in an oligochaete lineage or would the loss of posterior sucker place them in the Hirudinea?

The Formation of Vegetable Mould Through the Action of Worms is the title of a classic study by Charles Darwin.What is the true role of earthworms in soil formation?

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

____________ organs are ciliated sensory pits or slits that appear to be chemoreceptive for food gathering.

The blood of an earthworm contains

Chloragogen cells

________________ cells surround the intestine in the earthworm and function in excretion and in synthesizing glycogen and fats.

A robin has difficulty pulling an earthworm from its earthen burrow because of small chitinous bristles called

When earthworms copulate,each stores the other's sperm in chambers called a/an

The high degree of development of eyes in the family Alciopidae is related to

Polychaetes differ from other annelids because polychaetes

Giant axons are utilized in the earthworm for

The typical nervous system of a polychaete consists of

The calciferous glands in the earthworm

The feathery arms of fanworms that trap food particles are called ___________ _____________.

The Sipunculans live in burrows and feed on sediment deposits using

Considering the age of the various segments of an annelid such as an earthworm,

You experiment with a live earthworm and notice the following results: - With an intact earthworm,when you "poke" a segment,it contracts.- When you cut off the first segments containing the brain,the remaining worm still crawls.- When you cut the nerve in each septal wall,contractions continue.- If you cut the body wall,leaving the nerve cord intact,crawling still continues.- When you cut both the body wall nerve and the nerve cord,there are no longer any coordinated contractions.What is a reasonable conclusion?