arthropoda : remaining groups 2

Question 1

myriapoda

Answer 1

4 groups :
• chilopoda - centipedes 
• diplopoda - millipeded 
•pauropoda 
•symphyla 

14000 described species

origin in cambrian - 520 MYA
- many early terrestiral taxa were large

almost all modern taxa are terrestrial

Question 2

myriapoda : chilopoda

Answer 2

• centipedes - largely active predators
• one pair of legs per segment

scutigera and relatives have evolved the most rapid gait :

• long legs
• leg length increases down trunk
• dorsal cuticle plates overlap segments
• compound eyes ( indpendent origin to those in insects )
• tracheal ‘lungs’ connected to the pericardum - unique organs

Question 3

geophilomorpha

Answer 3

( chilopod )

largely burrowers - have ventral glue glands for defence

Question 4

lithobiomorpha

Answer 4

( chilopod )

active predators - well developed eyes, serrated bases to poison claws

Question 5

scolopendromorpha

Answer 5

( chilopod )

active predators - well developed eyes, larger species often have very painfull bite

Question 6

myriapoda : diplopoda

Answer 6

• millipedes - mostly detritivores
• burrowers in soil and litter
• two pairs of limbs per (visable) body segment

Question 7

diplopoda : polyxenida

Answer 7

sister to all other extant millipedes - soft bodies, bristly, sperm deposited as spermatophores