Material presented in class on Friday, 4/7/00 and Monday 4/10/00.
Quiz # 7 given Mon 4/10 is at bottom of this page

Try filling in this chart; practice making charts like this and filling them in to study in a comparative way.

However, don’t stop after ‘memorizing’ information in a table like this.

•  Ask yourself if the characteristics allow the animals to do something different than other
        animals, or live somewhere that other animals cannot live (especially compared to
        ancestral forms).

•  Ask if the characteristics are found in ancestral forms or not.

•  Be able to explain what animals are more closely related to one another - and why

Included in this table are only a few of the many categories you might use for comparisons - add more to help you study (you might add modes of reproduction, for example).

	|--------------	Bilateral	Coelomates	---------------	------------	--------------->
	|--------------------	--------------	Protostomes	----------------------	--------------|	Deuterostomes
	Mollusca	Annelida	|--------------	-----Arthropoda---	-------------|	Echinodermata
			Chelicerata	Crustacea	Uniramia
SYMMETRY	bilateral	bilateral	bilateral	bilateral	bilateral
BODY FORM  /CAVITY?	coelomate - schizocoelom	coelomate	coelomate	coelomate	coelomate
embryonic TISSUE LAYERS	3 layers	3 layers	3 layers	3 layers		3 layers
DIGESTION	complete digestive tract
CIRCULATION			open
RESPIRATION
MOVEMENT		circular & longitudinal muscles		jointed appendages
NERVOUS SYSTEM		cerebral ganglia, ventral solid n.c.	cerebral ganglia, ventral solid n.c.
HABITAT	aquatic (marine & fresh) & terrestrial	aquatic (marine), damp soils	aquatic (marine) & fully terrestrial			aquatic (marine),
EXCRETION	excretory tubes
SKELETON						endoskeleton
SPECIALTIES?

Quiz #7

1. Which of the following is not associated with a parasitic lifestyle as seen in Cestoda and Trematoda?
    a. complex digestive systems
    b. flattened body
    c. extensive reproductive organs
    d. life cycles with multiple hosts
    e. reduced gastrovascular cavity

2. The presence of a true coelom is advantageous because  …
    a. it is the third germ layer.
    b. it permits development of open circulatory systems
    c. it provides a space for the development of internal organs.
    d. it is necessary for a digestive system.
    e. it functions in performing excretion.

3. Write one main idea about invertebrate biology you learned about today. (2 pts)