March Through the Animals
Porifera - Sponges Pores Collar cells Amebocytes Spicules Sessile
Cnideria hydra, jellyfish, coral, anemone Nematocysts Gastrovascular cavity Tentacles Sessile or free living
Platyhelminthes (Flatworm) Tapeworm, Planaria Gastrovascular Cavity Pharynx Eyespots Cephalization Hermaphroditic
Nematoda – Roundworms Vinegar Eel, Hookworm Complete digestive system Parasitic & free-living Different sexes
Mollusca Snails, Clams, Octopus, Squid All organ systems present Mantle – secretes shell Radula – scraping/cutting mouth part
Annelida Earthworm, Leech, Marine Worms Body segmented Setae – 4 pairs of bristles/segments Closed circulatory system Primitive brain Nephridia – excretion hermaphroditic
Arthropoda Chelicerata Spiders, Ticks, Scorpions Exoskeleton Specialized appendages Chelicera – sting prey Head thorax – abdomen Book lungs 8 legs 8 eyes Open circulatory system
Arthropoda Crustacea Crayfish, Lobster, Crabs, Daphnia, Barnacle Exoskeleton Specialized appendages Mandables – specialized mouth parts Head, thorax, abdomen Gills Compound eyes Ventral nerve cord Open circulatory system
Arthropoda Uniramia Insects, Centipedes, Millipedes Insects – 6 legs Exoskeleton Head, thorax, abdomen Segmented – centipede & millipede Ventral nerve cord Open circulatory system
Echinodermata Starfish, Sea Urchin Calcareous skeleton Water vascular system Gas exchange, feeding, movement Tube feet Complete digestive system Open circulatory system Regeneration