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Kingdom Animalia. Evolutionary tree of major animal phyla:. X. __. X. Study figure from textbook. Also, study table 22-1. Kingdom Animalia. Evolution of the coelom (body cavity):. Kingdom Animalia – Phylum Annelida.
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Kingdom Animalia Evolutionary tree of major animal phyla: X __ 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 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.
