Ch 31 Flashcards
Fossils indicate that Proto zone lineages originated in the
Ocean
What kind of challenges did protosomes Have to overcome to transition to land
The exchange of gases
Avoid drying out
Hold up their bodies under their own weight
The body plan of the mollusk
Foot
Visceral mass
Mantle
The purpose of the foot in the mollusk
It is a large muscle located at base of the animal used in movement
What does the visceral mass do for the mollusks
The visceral mass contained most of the main internal organs and external gill
What was the purpose of the mantle in the mollusk
Growth of the body wall that covers the visceral mass
What are the lineages of the mollusks
Chitons - mollusks
Bivalves - clams
Gastropods - slugs
Cephalopods - squids
The foot of the Bivalves are used to
Dig appendages
Cephalopods use the foot (tentacles) to
Crawl and grasp
The foot of the snail and chitons Are used to
Move by muscle contractions that sweet backward or forward allowing them to crawl along the surface
Anther pods are defined by what three key features
Number one the segmented body (tagmata)
Number two the exoskeleton
Number three jointed appendages
Body of grasshoppers and other insects are divided into
The head the thorax and the abdomen
The body of a spider or crayfish is divided into the Cephalothorax
Meaning Head chest and abdomen
The exoskeleton is primarily made of
the polysaccharide chitin strengthened by calcium carbonate in crustaceans
What do jointed appendages do For Anthropods
Enable the rigid body to move
