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Kingdom Animalia
Evolutionary tree of major animal phyla:
X
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X
Study figure from textbook.
Also, study table 22-1
Kingdom Animalia
Evolution of the coelom (body cavity):
Kingdom Animalia – Phylum Annelida
Phylum Annelida – segmented worms (~12,000 species) - general characteristics:
Bilaterally symmetrical, segmented worms
Digestive tract complete, usually with regional specializaiton
Closed circulatory system
Nervous system well developed
Marine, terrestrial, and freshwater species exist
Include earthworms, marine polychaetes, and leaches
Kingdom Animalia – Phylum Annelida
Generally speaking, annelids are a very
diverse group, particularly the marine
polychaetes which may have highly
developed appendages.
Kingdom Animalia – Phylum Arthropoda
Phylum Arthropoda – Insects, spiders, crustaceans, etc. (>1,000,000 species – maybe
up to 10,000,000??)
General characteristics:
Body segmented, both internally and externally
Most groups have a strong tendency toward regional body specialization
Cuticle made up of chitin makes up a well developed exoskeleton. In some
groups, the chitinous cuticle is calcified
Most have very efficient and well developed gas exchange, circulatory,
sensory, and nervous systems.
Kingdom Animalia –Arthropod Growth
Kingdom Animalia – Arthropod Diversity
Insects: The most common of all groups in the animal kingdom, insects have
three pairs of legs, and typically two pairs of wings.
Arachnids: include spiders, ticks, mites, and scorpions. Have four pairs of legs,
most carnivorous, they feed on blood or a liquid diet of predigested prey.
They paralyze prey using their sting, then inject them with digestive juices.
Crustaceans: include crabs, lobsters, shrimp, and barnacles. This is a very diverse
group of mostly marine organisms.
Kingdom Animalia – Insect Diversity
Kingdom Animalia – Arachnid Diversity
Kingdom Animalia – Crustacean Diversity