Dissection of the Crayfish Analysis Questions

flex

What can the crayfish do with the abdomen that it cannot do with the cephalothorax?

the crayfish takes in large amounts of water

how does the crayfish increase in size after a molt?

20

how many pairs of appendages does the crayfish have?

to see predators and prey easily

how might having a wide field of vision be an advantage to crayfish?

Crustacea

to what class class does the crayfish belong?

mandibles

what appendage(s) are used for biting and chewing?

chelipeds

what appendage(s) are used for defense and capturing prey?

maxillae and maxillipeds

what appendage(s) are used for holding food?

uropods and telson

what appendage(s) are used for propelling the crayfish backwards through water?

eyes

what appendage(s) are used for sight?

seimmerets

what appendage(s) are used for swimming and reproduction?

antennules and antennae

what appendage(s) are used for taste, touch, and smell?

walking legs

what appendage(s) are used for walking?

crawdads or crawfish

what are two alternate "local" names for the crayfish?

head and thorax

what are two parts of the cephalothorax?

remove excess water and wastes from the blood

what do the green glands do in a crawfish?

circulate water over fills when it walks

what do the walking legs do for the respiratory system?

feeds on dead/decaying matter, insect larvae, and worms

what does the phrase "cannibalistic scavenger" mean?

chitin

what is the exoskeleton made of in the crustacean?

jointed legs

what is the major characteristic of members of phylum Arthropoda?

Arthropada

what is the phylum to which the crayfish belongs?

molting

what is the process called when a crayfish sheds his exoskeleton?

gills

what organs do crayfish use for breathing?

3/4

what portion of all known species of animals are arthropods?

large, feathery

what's the structure of the gills?