the animal kingdom bio 100 tri-county technical college pendleton, s. c. 29670
TRANSCRIPT
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The Animal Kingdom
Bio 100
Tri-County Technical College
Pendleton, S. C. 29670
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General Features of Animals
• Movement of the entire animal or movement of a part of the animal.
• Heterotrophic mode of nutrition
• Soft Bodies
• Respond quickly and appropriately to changes in their environment
• Sexual reproduction
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• Some few animals reproduce asexually and sexually.
• Eucaryotic cells
• No cell walls
• Multicellular forms organized into tissues, organs, and organ systems
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Asexual vs. Sexual Reproduction
• Asexual reproduction– some part of the animal body detaches and
grows into an exact duplicate of the parent– no variation
• Sexual reproduction– union of egg and sperm results in an organism
that is similar to parents but not exactly like them
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Temperature Regulation
• Ectotherms– body temperature varies– “cold-blooded”– reptiles
• Endotherms– maintain a constant body temperature– “warm-blooded”– mammals
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Body Symmetry
• Asymmetry– no regular body form– sponges
• Radial symmetry– “pie” symmetry
• Bilateral symmetry– one plane divides the body into two halves that
are mirror images of each other
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Tubular Bodies
• Most animals with bilateral symmetry– body structure composed of 3 layers– tube within a tube– outer tube
• muscles and nerves
– inner tube• digestive system with a mouth at one end and an
anus at the other
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Coelomate vs. Acoelomate
• coelom– body cavity between the two tubes
• coelomate animals have a coelom– advanced animals: earthworms, insects,
reptiles, birds, and mammals
• acoelomate, pseudocoelomate– do not have coelom– simple animals: jellyfish and flatworms
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Vertebrate vs. Invertebrate
• Invertebrate– don’t have a backbone– invertebrate phyla: Porifera, Cnidaria,
Platyhelminthes, Nematoda, Annelida, Arthropoda, Mollusca, Echinodermata
• Vertebrate– have a back bone (vertebral column– vertebrate phylum: Chordata (Vertebrata)
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THE ANIMAL KINGDOM
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Phylum Porifera
• the sponges
• water circulates through the body
• marine and freshwater forms
• adults are anchored to something– sessile pattern of existence
• most exhibit radial symmetrical
• no true tissues
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Phylum Cnidaria
• hydras, jellyfish, sea anemones, and coral reef
• radial symmetry
• tentacles and stinging cells
• marine mostly
• incomplete digestive tract
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Phylum Platyhelminthes
• flatworms--prefix “platy” means flat
• bilateral symmetry
• no body cavity
• incomplete digestive system
• planaria, tapeworms, and flukes
• some cause human disease: tapeworms and flukes
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Phylum Nematoda
• roundworms
• cuticle covered body
• pseudocoelom
• complete digestive tract-mouth and anus
• some parasites and some free-living
• pinworm disease in humans
• plant root nematodes
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Phylum Mollusca
• muscular foot for locomotion
• many have a calcium carbonate shell
• complete digestive tract
• have a true body cavity
• body is not segmented
• clams, squids, snails
• many use gills for respiration
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Phylum Annelida
• segmented worms
• body segmentation
• complete digestive tract
• true body cavity
• bilateral symmetry
• earthworms and leeches
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Phylum Arthropoda
• bilateral symmetry
• tough exoskeleton
• segmented: head, thorax, and abdomen
• joint-legged
• insects, spiders, crustaceans, centipedes, and millipedes
• tremendous numbers
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Phylum Echinodermata
• spiny-skinned animals
• no body segmentation
• larval stages bilaterally symmetrical
• adults radially symmetrical
• water vascular system--tube feet
• endoskeleton under spiny skin
• starfish and sea urchins
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Phylum Chordata
• bilateral symmetry
• segment body with endoskeleton
• well-developed body cavity
• single, dorsal nerve cord
• enlarged anterior end of nerve cord (brain)
• tail at some stage of development
• complete digestive system
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Subphylum Vertebrata
• vertebral column to protect spinal cord
• movement by muscles attached to endoskeleton
• complete digestive system with large digestive glands
• ventral heart with 2-4 chambers
• blood with RBC’s and WBC’s
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• well-developed body cavity
• paired kidneys with drainage to exterior
• general body plan– head– trunk– 2 pairs of appendages– postanal tail
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Classes of Vertebrates
• Class Agnatha -- jawless fishes
• Class Chondrichthyes -- cartilaginous fishes
• Class Osteichthyes -- bony fishes
• Class Amphibia -- amphibians
• Class Reptilia -- reptiles
• Class Aves -- birds
• Class Mammalia: mammals
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Class Agnatha
• “Jawless” fish
• Hagfish and lampreys
• Some are parasites that suck the blood out of host
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Class Chondrichthyes
• cartilaginous skeleton
• sharks, rays, and skates
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Class Osteichthyes
• skeleton made of bone similar to ours
• bony fishes
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Class Amphibia
• frogs, newts, and salamanders
• made a partial break from water
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Class Reptilia
• turtles, snakes, lizards
• made a complete break from water
• have lungs and water proofed skin
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Class Aves
• birds
• only vertebrates with feathers
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Class Mammalia
• have hair over most of the body
• have mammary glands that produce milk
• specialized teeth
• feed newborns with milk
• hair modified to spines in some mammals
• 4 chambered heart
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Mammals, ctd.
• Monotremes are egg-laying mammals– Duck-bill platypus one of three existing species
– Females do not have nipples
• Marsupials are the pouched mammals– Kangaroos, koalas, opossums
– Deliver offspring that complete development in pouch
• Eutherians (placental mammals…but)– Deliver well-developed offspring