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Download Table One – Invertebrate Characteristics
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Table One – Invertebrate Characteristics Phylum Sponges Cnidarians Flatworms Annelids Arthropods Mollusks Echinoderms Chordates Symmetry Asymmetrical Radial Bilateral Bilateral Bilateral Bilateral 5 part radial Bilateral Locomotion Sessile Slow moving or sessile Longitudinal muscles Longitudinal & circular muscles Muscles attached to exoskeleton Muscular foot Water vascular system Muscles attached to endoskeleton # of body openings Many pores 1 1 2 2 2 2 2 Number of tissue layers One 2 3 3 3 3 3 3 2 nerve cords & ganglia in each segment – ganglia in head Nerve cord w/ ganglia; brain Nerve ring around esophagus & nerve cord Nerve ring plus nerve cords along each arm Nerves & central nervous system with brain Nervous system None Verve net Nerve clusters & ventral nerve cord Digestive system No system but specialized cells called amoebocytes Gastro vascular cavity Gastrovascular cavity Complete digestive tract – mouth & anus Complete digestive tract – mouth & anus Complete digestive tract – mouth & anus Short digestive tract with mouth & anus Digestive tract with mouth & anus Excretory system No system but specialized cells called amoebocytes Expulsion from G. C & simple diffusion Diffusion Nephridia Malpighian tubules Nephridia No special system – diffusion Kidney Circulatory system No system but specialized cells called amoebocytes Distributed to cells that line cavity Distributed to cells that line cavity Closed Open with dorsal heart Open with dorsal heart Fluid filled cavity transports nutrients Closed Respiratory system No system but specialized cells called amoebocytes No special structure diffusion across cell membrane No special structure diffusion across cell membrane Moist skin Gills tracheal tubes book lungs mantal cavity with gills or lung Water vascular system Lungs/gills Skeletal system spicules Fluid filled gastrovascular cavity Fluid filled gastrovascular cavity Hydrostatic skeleton Exoskeleton of protein & chitin Mantle produces shell Endoskeleton with hard plants Bones endoskeleton
