Domain Eukarya Kingdom Animalia

Coelom? Body cavity - space between digestive tract wall and body wall, surrounded by mesoderm cells, location of organs Phyla: Mollusca, Annelida, Arthropoda, Echinodermata, Chordata

Pseudocoelom? Space around digestive cavity, not surrounded by mesoderm cells Phylum Nematoda

gut

Symmetry Balance or arrangement of parts asymmetry- no symmetry Porifera radial- wheel plan Porifera, Cnidaria, Echinoderm adults bilateral- 2 sided Echinoderm larva, Platyhelminthes, Arthropods, Annelids, Chordata

Protostome? Coelom develops from a solid mass of cells, blastopore becomes mouth Mollusca, Annelida, Arthropoda Mouth

Deuterostome? Coelom forms from outgrowth of digestive tube, blastopore becomes anus Echinodermata, Chordata Anus

Domain Eukarya Kingdom Animalia

Traits Eukaryote Multicellular Heterotroph No cell wall Diploid except for gametes Most internal digestion Most zygotes with developmental stages

Animals probably evolved from colonial protists

Phylum Porifera Traits Radial or asymmetry 3 layers of cells, no tissues or organs No developmental stages or layers Cellular digestion Water dwelling Examples: sponge

Phylum Cnidaria Traits: Radial symmetry Tissues (muscle, nerve) no organs 2 developmental layers (endo & ectoderm) No coelom One opening Tentacles with stinging cells Water dwelling

Phylum Cnidaria Examples: coral, hydra, sea anemone, jellyfish

Phylum Platyhelminthes Traits: Bilateral symmetry Simple organs and systems 3 developmental layers (endo, ecto, mesoderm) No coelom One opening Examples: planaria, flukes, tapeworms

tapeworm

fluke

Phylum Nematoda Traits: Bilateral Organs and systems (no circulatory) 3 developmental layers Pseudocoelom 2 openings Examples: nematodes of soil & water, trichina parasites

Phylum Mollusca Traits: Bilateral, 3 layers, 2 openings, coelom Organs and systems (open circulatory) Coelom (protostome) Examples: snail, slug, oyster, octopus, clam

Phylum Annelida Traits: Bilateral, 3 layers, 2 openings, coelom Systems (closed circ) Segments Coelom (protostome) Examples: earthworms, sandworms, leeches

Phylum Arthropoda Traits: Bilateral, 3 layers, 2 openings Coelom (protostome) Exoskeleton of chitin Jointed appendages Examples: spider, insect, lobster, scorpion, tick

Phylum Arthropoda 5 classes: Horseshoe crabs Arachnids (spiders) Crustaceans (lobsters, crabs) Millipedes and centipedes Insects (grasshoppers, bees, butterflies, ants, mosquitoes)

Phylum Echinodermata Traits: Bilateral larvae, radial adults 3 layers, 2 openings Coelom (deuterostome) Endoskeleton Water vascular system, marine Examples: starfish, sea urchin, sea cucumber

Phylum Chordata Traits: Bilateral, 3 layers, 2 openings Coelom (deuterostome) Dorsal, hollow nerve cord Notochord (cartilage rod in back) Gill structures Post-anal tail Invertebrate examples: tunicates, lancelets

tunicate

Lancelet

Classes Vertebrate chordates Agnatha- Jawless fish- lamprey

Classes Vertebrate chordates Chondrichthyes- cartilage fish, gill slits, no scales- sharks, rays

Ray

Classes Vertebrate chordates Osteichthyes- bony fish, scales, operculum- tuna, trout, koi

Classes Vertebrate chordates Amphibian- no hard shell on eggs, moist skin, reproduce in water- frogs, toads, salamanders

Classes Vertebrate chordates Reptilia- shelled (amniotic) egg, cold blooded (ectothermic), scales- lizards, snakes, alligators, turtles

Classes Vertebrate chordates Aves- shelled amniotic egg, warm blooded (endothermic), scales & feathers birds of all kinds

Classes Vertebrate chordates Mammalia- hair, warm blooded, amniotic egg that developes inside mother, mammary glands – bat, dolphin, kangaroo, human