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8 Cards in this Set

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  • Back
Porifera
SPONGES
-Assymetrical
-Organized as an assemblage of different kinds of specilaized cells, e.g., collar cells
-No tissues
-Skeleton lacking or made of spicules
Cnidaria
JELLYFISH, CORALS, ANEMONES, HYDRA
-2 tissue layers with nerve and muscle tissues
-Nematocysts - conatained in cnidocytes or cnidoblasts used for offense and defense
-2 main life forms: medusa or polyp
Platyhelminthes
FLATWORMS
-Bilaterally symmetrical with a head and a tail
-Centralized nervous system
-3 tissue layers
-No coelom, no circulatory system, and no hard skeleton
Annelida
POLYCHAETES, EARTHWORMS, LEECHES (CAMBRIAN EXPLOSION)
-Elongate & bilateral with segmented true body cavity (coelem)
-Complete circulatory system with capillaries, arteries, and veins
-Body wall made of circular and lengthwise muscles
-Continuous gut running from mouth to anus with own musculature
-Bristle-like structure, (setae) except leeches
Arthropoda
CRUSTACEANS, SPIDERS, MILLIPEDES, CENTIPEDES, INSECTS
-Hard exoskeleton made of chitin and protein
-Possess numerous jointed appendages and a segmented body
-Must molt to grow
Mollusca
CLAMS, SNAILS, SLUGS, NAUTILUS, OCTOPUS
-Rasping organ called a radula except bivalves and Aplacophora
-Muscular foot for locomotion and other tasks
-A mantle that covers body and can secrete the shell
-A mantle cavity that houses the gills or lungs
-A calcium shell in most molluscs, but some have reduced shell or none at all
Echinodemata
SEA STAR, SEA LILIES, SEA URCHINS, SEA CUCUMBERS, BRITTLE STARS
-Internal skeleton made of little calcium plates
-5-part symmetry
-Specail fluid-filled system (water vascular system) that operate the tube feet
Chordata
TUNICATES, LANCELETS, VERTEBRATES(AMPHIBIANS, REPTILES, MAMMALS)
-Notochord
-Dorsal Nerve Cord
-Gill Clefts
-Segmented muscles (except tunicates)
-Post-anal tail