Millipedes are wormlike terrestrial creatures that eat
decaying matter. Only 2 pairs of short legs per body segment.
Centipedes are terrestrial carnivores with poisonous claws used
in defence & to paralyze prey (cockroaches & prey). Each body
segment bear single pair of long legs.
Nearly aquatic. (Lobsters , crayfish, crabs, & fish)
Barnacles – with cuticle that Is hardened into shell containing
calcium carbonate. Jointed appendages project from shell to
strain food from water. Most anchor to objects. They produce
adhesive stronger than any glue.
Copepods & Krill – serve as food sources for fish & whales.
Characteristics Arthropods have in common:
o Specialized jointed appendages
Section 20.12 – Insects are the most successful group of animals.
Characteristics for success of insects:
Similar to Arthropods – body segmentation, exoskeleton, &
jointed appendages. Flight, waterproof coating on the cuticle,
& complex life cycle.
Short generation & large offspring’s. Natural selection acts
rapidly, & alleles offer reproductive advantage can be
quickly established in population.
Metamorphosis – animal takes on