class arachnida and class merostomata Flashcards
(7 cards)
1
Q
what organisms are included in the class arachnida?
A
scorpions, spiders, ticks, mites
2
Q
list the 6 pairs of appendages found on these organisms?
A
chelicerae, pedipalps, 4 pair of walking legs
3
Q
what type of birth may spiders give?
A
oviparous or ovoviviparous
4
Q
what are ticks and mites known as?
A
ectoparasites which have the greatest impact on human health
5
Q
what organisms are in the class merostomata?
A
horseshoe crabs
6
Q
what important body structure does a horseshoe crab have and what does it do?
A
telson enables them to flip over
7
Q
what is significant about the evolution of the horseshoe crab?
A
no major changes in body form due to stabilizing selection (no major environment changes)
