crayfish/worm comparative study

Movement:

Crayfish:

• crayfish have jointed appendages
• crayfish have swimmets which allow them to swim 
• legs enable walking on land

Worm:

• worms do not have legs to walk
• every segment on a worm is a muscle
• by contracting and expanding these muscles the worm is able to move

Excretory system:

Crayfish:

• the excretory system is located near the eyes
• have green gland near the base of the large antennae
• have excretory pore

Worm:

• have 2 niphridia in every segment
• these connect to pores which get rid of the waste
• worms have 1 long digestive track which starts at the mouth and goes all the way back to the anus

Reproduction:

Crayfish:

• are either male or female
• gonads are located dorsal side of the thorax

Worm:

• worms are hermaphrodites (have both sexes)
• they cross fertilize
• they mate by attaching clitella and exchanging sperm
• reproductive organs are found in section 9 and 10

Habitat:

Crayfish:

• live in water
• have gills to enable breathing underwater
• have swimmets to enable movement underwater

Worm:

• live in soil
• prostonium at the mouth closes when the worm isnt feeding to prevent soil from entering worm
• have circular muscles to enable movement through soil