Animal Characteristics• Multicellular,

heterotrophic eukaryotes

• No cell walls• Nervous & muscle

tissue present in most• Sexual reproduction,

diploid life cycle is dominant

• All have similar developmental stages

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Our Ancestor

mesoderm

Porifera• No true tissues• Choanocytes• Amoebacytes• Sessile• Reproduction

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Cnidaria

• Jellyfish,hydra• Gastrovascular cavity• Nerve net• cnidocytes• Medusa/polyp

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Platyhelminthes-flatworms

• Planarians, tapeworms• Protonephridia• Clear CNS• Eye spots

Nematoda• Roundworms

– Trichinella– C.elegans

Mollusca• Gastropoda, bivalvia

– Radula– Muscular foot, visceral mass, mantle– Complete dig., open circulatory

• Cephalopoda(squid)– Closed circ., well developed senses, intelligent

Annelida

• Segmented worms• Closed circ., complete

dig.• Metanephridia(excretion)

Arthropoda

• Insecta(terrestrial), crustacea(marine)

• Exoskeleton, molting, compound eyes,

• Malphigian tubules• Spiracle/tracheae

Echinoderms

• Seastars• Tube feet• Water vascular

system• Deuterostomes• Radial symmetry• Nerve nets

Chordata• Notohord-precursor to vertebrae

Subphylum-vertebrates

All have1. Vertebral column2. Closed circulation3. cephalization

• Chondrichthyes• Osteichthyes• Amphibia

• Reptile• Aves(birds)

mammals• Characteristics

– Mammary glands (milk)– Hair– Endothermic– Well developed respiratory

& circulatory systems– Internal fertilization

• Monotremes(egg laying)• Marsupials(pouches)• Placental