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This article introduces the taxonomy and classification of animals based on characteristics and adaptations for survival. Learn about the six kingdoms, symmetry types, and key terminology such as Phylum Porifera, Cnidaria, Ctenophora, Platyhelminthes, Nematoda, Rotifera, and Annelida, with details on their species, habitat, and traits.
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Classification Domain Kingdom Phylum Class Order Family Genus species
Symmetry • Radial- 2 axis • Bilateral- 1 axis • Spherical- 3 axis • Pentaradial- fives • Asymmetrical- none
Adaptation-survival traits that are genetic Nocturnal Diurnal Sessile Parasite Mutualist Commensalist Terrestrial Arboreal Aerial fossorial Aquatic Marine Freshwater Brakish Needed terminology
Phylum Porifera • Sponges (10,000 spp) • All sessile, filter feeders • Mostly marine • Asymmetrical • Hermaphroditic or asexual • Specialized cells called choanoflagellates • No tissue layers
Choanoflagellates Specialized cells working together
Spicule skeleton made of SiO2 • As big as a meter • Gemmules for asexual reproduction
All have nematocysts Mostly marine, some sessile, some drifters Radial symmetry True tissue: dermis with mesoglea Have a central digestive compartment gastrovascular cavity (process food and gases) Simple nerve net All Carnivorous Phylum Cnidaria (coelenterata)
2 basic forms MEDUSA-umbrella shaped drifters POLYP-cylindrical mostly sessile
3 classes • Hyrdrozoa-hydras and fire coral • Both polyp and medusa, asexual budding and sexual reproduction • Anthozoa-anemones, coral • All polyp, solitary or colonial, sexual reproduction, symbiotic protists and algae • Scyphozoa-jellyfish • All medusa
Phylum Ctenophora- “comb jelly” • Close relatives of cnidaria • Nematocysts present in retractable tentacles • Radial symmetry • Largest organism to use cilia for locomotion • Sexual reproduction • Bioluminescent
Phylum Platyhelminthes-flatworms • Free-living (planarians) or parasitic (flukes, tapeworms) • Acoelomates (no true body cavity) • Aquatic or terrestrial • Bilateral symmetry • Nervous system with bundles (ganglia) • Eye spots • Small but as long as 35 ft
3 classes • Turbellaria-planarians • Free-living, carnivorous or scavengers, hermaphroditic, regeneration capabilities • Trematoda-flukes • All parasitic, attach with hooks/suckers, have microvilli on surface for absorbing food through skin • Cestoda-tapeworms • All parasitic, also have microvilli for direct absorption
Phylum Nematoda-roundworms • Hookworms, lungworms, pinworms, trichina (in pork), schistosome, heartworms • Free-living or parasitic • Separate sexes (females can lay 200,000 egg/day) • One way digestive tract • Some have teeth/hooks • Muscles are longitudinal moving/bending/flipping
Phylum Rotifera- “wheeled” • Microscopic • Common in freshwater • One way digestion • Bilateral symmetry • Knots of nerves form primitive brain • Only females lay eggs (parthenogenesis)
Phylum Annelida- segmented worms • Annulus=ring • Aquatic and terrestrial • Scavengers, some active predators (leeches) • Complex muscle system-longitudinal and radial muscle contraction • One way digestion • Have circulatory system, primitive heart • Complex nervous system-brain/often eyes • Sexual-hermaphroditic • Some regeneration
3 classes • Polychaeta • Paddle-footed and has bristles called SETAE, marine (hairy sea mouse) • Oligochaeta • Terrestrial and freshwater, few bristles (earthworms) • Hirudnea • Blood suckers (leeches) • Free-living or predators