Lab 6: Phylum Annelida Quiz

What are the Classes Involved in Phylum Annelida?

Polychaeta, Oligochaete, and Hirudinomorpha

What species are in Class Polychaeta

Nereis, Cheatopterus, and Eudistyla

What are the major body plan features of Class Polychaeta?

1. true coelomate

2. contain chaeta

3. coeleum is organized into segments separated by septa

4. contain parapodia on each segment

5. little tagmosis

6. cephalized

7. have head magma, eyes, palms, cirri, and tentacles

What is the function of circular muscles? Where are they located?

1. constrict to reduce diameterr

2. outerrmost layer near epidermis

What is the function of longitudinal muscles? Where arer they located?

1. contract to lengthen the body

2. beside circular muscles

What is the Ecology of Class Polychaeta?

1. aquatic; mainly marine, some freshwater

2. some free moving, some sessile

What is the genus name of Class Oligochaete

Lumbricus Terrestris (earthworm)

What are the major body plan features of class Olgiochaeta?

1. uniform segments

2. small lateral chaeta

3. no parapodia

4. movement through peristalis

5. citellium on mature males; secretes mucous and egg cocoon

What is the ecology of class Olgiochaeta?

1. mainly freshwater, come marine

2. hermaphroditic

What is the group of Class Hirudinomorpha ?

the leech

What are the major body plan features of Class Hirudinomorpha?

1. no chaeta

2. anterior and posterior sucker

3. 34 segments; superficial annuli

4. invisble citellum

5. inchworm movement by suckers

6. dorso ventrally flattened

What is tagmatization?

specialization of regions of the body for specific functions

What are parapodia?

paired lateral extensions on each segment; used for swimming, crawling, and burrowing

What are chaetae?

bristles made of chitin

What are annuli?

superficial external rings on a leech

What are cirri?

The stiff joining together of cilia to form leg-like structures for walking-like locomotion

What is a coelom?

A fluid-filled cavity that is completely lined by mesoderm tissue.

What is the chaeta made up of in Lumbricus terrestis?

Calcium carbonate; bifringent

What are chaetal retractor muscles?

Protractor (circular) and retractor (longitudinal) muscles used for protruding and withdrawing the chaetae in Class Oligochaete

What is the purpose of fans in Chaetopterus?

modified parapodia to pump water into the anterior end

What do the lighter stained cells in the clitellum of Lumbricus secrete? What is its purpose?

1. Albumin

2. Food for the egg

Label Lumbricus terrestris

Locate the hearts, dorsal blood vessels and ventral blood vessels, mouth, and pharynx in the Lumbricus Terrestris

What is acicula?

Chitinous rods aiding in structural support and digging

Class Polychaeta

Nereis

What Class and Genus is this?

Class polychaeta

Chaetopterus

What Class and Genus is this?

Class Polychaeta

Eudistylia

What Class and Genus is this?

albumin in lumbricus

light stained cells secrete this for food for the developing embryos in cocoon