Ecdysozoa. Protostomes are divided into two large groups the Lophotrochozoa and the Ecdysozoa. The molluscs are the last group of the Lophotrochozoa we will deal with this semester. The Ecdysozoa includes two major groups the Nematoda and the Arthropoda. Ecdysozoa.
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Male (top) and female Ascaris lumbricoides
Section through hookworm
attached to dog intestine
Hookworm life cycle
a serious bacterial
Interestingly, the traditional symbols for medicine
and healing the staff of Asclepias (showing a
snake entwined around a staff) and the caduceus
(which shows two snakes entwined about
a winged staff) very likely are derived from the
Guinea worm removal technique.
Trichinella life cycle in humans
Elephantiasis of leg
caused by filarial worms