Unformatted text preview: Porifera Cnidarians Platyhelminthes (specifically, planarian) Annelida (specifically, earthworm) Mollusca Echinodermata Arthropoda Symmetry radial radial bilateral bilateral bilateral radial, bilateral in larvae bilateral Protostome (mouth first)/Deuterostome n/a n/a n/a Protostome Protostome Deuterostome Protostome Respiratory diffusion diffusion diffusion Ctenidium puts oxygen into the blood diffusion Insects have trachea and spira Circulatory chaonocytes have flagella that beat dorsal blood vessel, ringlike hearts (at esophagus), and a ventral vesse open circulatory system with hemolymph. Most bivalves h very limited (watervascular system) open circulatory system with h Skeletal skeletal fibers often have a calcareous (mineral, not chitin) shell endoskeleton chitinous exoskeleton (must m Coelom no no no yes yes yes, large coelom yes Reproduction sexual and asexual (Hydra have budding) monoecious; sexual or asexual (by regeneration) Hermaphroditic; six seminal vesicles, spermatheca (seminal receptacle dioecious Dioecious (separate sexes) dioecious Segmentation yes some segments may have fused Excretory diffusion Undigested food expelled through mouth; nitrogenous wastes diffuse out of cells; pro Nephridia. nephridia for nitrogenous waste diffusion cockroachmalpighian tubules Metamorphosis Holometabolous vs Hemimeta Cephalization none some "brain" (suprapharyngeal ganglia) some none lots Nervous system primitive nerve net nerve ladder, eye spots suprapharyngeal ganglia, ventral nerve cord w/ ganglia primitive primitive ventral nerve cord with ganglia Germ layers Epidermis and Gastrodermis; mesoglea = gel matrix in between Ectoderm, mesoderm, endoderm Locomotion four pairs (8) setae on each segment watervascular system (also provides some Jointed appendages Digestion Amoebocytes distribute food; GVC GVC, with gastrodermis lining GVC, branched digestive system, extendable pharynx (for Cockroach): crop, gizzard GI tract: pharynx, esophagus, crop, gizzard, intestine, anus GI tract (for starfish) Cardiac stomach > Pyloric stom Level of organization cell level tissue with specialized cells: epithelial, digestive, contractile (musclelike), sensory organ organ organ (Other) sessile polyp/medusa form dorsiventral, longitudinal, and circular muscles 5 Molluscan derived features: Shell, Mantle, Foot, Radula starfish has central disk and five arms, amb crayfish can have a gastrolith cnidocyte cells have stinging nematocyst organelles epithelium has dermal branchiae (extension clitellum adductor muscles specialized cells: epithelial, digestive, contractile (musclelike), sensory Hydra have basal disk Chordata (specifically, the rat) bilateral deuterostome pharynx, larynx, trachea, bronchi, bronchioles, alveoli vena cava, right atrium, tricuspid valve, right ventricle, pulmonary artery, pulmonary veins, left atrium, bicuspid (mitral) valve, le skeleton yes dioecious egments may have fused through GI tract. Also through kidneys to urinary system. Holometabolous vs Hemimetabolous metamorphosis yes brain, spinal cord, nerves Ectoderm, mesoderm, endoderm legs mouth, esophagus, stomach, small intestine (duodenum, jejunum, ileum), large intestine organ 4 chordate features: notochord, dorsal hollow nerve cord, pharyngeal gill slits, postanal tail dermal branchiae (extension of coelom helps respiration), pedicellariae (pincers that clean skin), and calcareous spines um, bicuspid (mitral) valve, left ventricle, aorta, pulmonary artery or other arteries, arterioles, capillary beds, venules, veins, vena cava (infe enules, veins, vena cava (inferior or superior) ...
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- Fall '08
- Biology, Ventral nerve cord, diffusion diffusion diffusion, bilateral bilateral radial, Protostome Protostome Deuterostome Protostome