Key differences & similarities of Tapeworms & Bloodsucking
leeches (Both parasites): o Both composed of repeated
o Tapeworm segments filled with reproductive organs &
shed from posterior end. o Tapeworms are flatworms with
no body cavity, & in parasitic lifestyle have no
o Leeches have a true coelom & complete digestive tract.
Section 20.11 – Arthropods are segmented animals with jointed
appendages & an exoskeleton.
Arthron – joint, Pod - foot
Crayfish, lobsters, crabs, barnacles, spiders, ticks,
Phylum Arthropoda regarded as
most successful animal phylum.
Diversity & success related to their
segmentation, exoskeleton, &
The arthropod body is covered by an exoskeleton
protecting the animal & provides point of attachment
for muscles that move the appendages.
o Appendages adapt for sensory
reception, defence, feeding,
walking, & swimming.
o Exoskeleton is a cuticle, nonliving veering in arthropods is
hardened by layers of protein Exoskeleton is thick around the head where its main function
is to house & protect the brain. It is paper thing &