animal kingdom one of 5 kingdoms …what are the others? invertebrates (8 phyla) vertebrates =...
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Animal KingdomOne of 5 Kingdoms …what are the
others?
Invertebrates (8 phyla)
Vertebrates = Phylum Chordata
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Let’s start at the very beginning . . .
Phylum Chordata is divided into three subphyla:
– Subphylum Urochordata (tunicates)– Subphylum Cephalochordata (lancelets)– Subphylum Vertebrata
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What is a Chordate?
All chordates have 4 basic features that are present at some point during their life cycle
– Hollow Nerve Cord – Nerve cord in which nerves branch out at regular intervals; dorsal nerve cord
– Notochord (backbone) – Long supporting rod that runs throughout body
– Paired structures (gill slits )in throat– Muscular Tail – Extends beyond anus (tailbone)
Only 4-5% of animals are chordates Examples = Fish, Amphibians, Reptiles, Birds
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Section 30-1
Muscle segments
TailAnus
Pharyngeal pouches
Mouth
Hollownerve cord
Notochord
The Generalized Structure of a Chordate
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Subphylum Vertebrates
Can be divided further into 5 classes Classes of Vertebrates include:
– Cold blooded (ectotherm) Reptiles Amphibians Fish
– Warm blooded (endothem) Mammals birds
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Fish – Basic Facts
Fish live in nearly every single aquatic habitat imaginable Fish are aquatic vertebrates characterized by fins, scales, and
gills Fish were the first vertebrates to evolve. Fish bring in Oxygen rich water through gills and remove
oxygen poor water through gill slits Closed circulatory system Four chambered heart Swim bladder controls buoyancy Most are egg laying (external/internal fertilization) Most move by contracting opposite muscles
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Fertilization
Many fish lay eggs– External fertilization
Process in which a sperm joins with an egg OUTSIDE of the body
– Internal fertiliation Process in which sperm join with an egg inside the body
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Groups of Fish
Jawless Fish – – Have mouths of soft tissue with no true teeth.– Have no bones– Only vertebrates with no vertebral column as adults– Lampreys, Hagfish
Chondrichthyes – – Skeleton built entirely of cartilage– Sharks, sea rays
Osteichthyes – – Bony Fish have swim bladders– Majority of fish fall in this order– Carp, sea horse, perch, etc.
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Swim bladders
Bony (Osteichthyes) fish have swim bladders
– Gas-gilled sac that gives fish buoyancy
– What is buoyancy?– What can bony fish do because of the swim
bladder?– Create an analogy with something you may use
and a swim bladder
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Lamprey – Jawless Fish
Catfish - Osteichthyes
Sea Ray - Chondrichthyes
Whale Shark - Chondrichthyes
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Amphibians – Basic Facts
Amphibian = “double life” Live in both water and land Most larvae are fishlike; adults are terrestrial carnivores Larvae respire through skin/gills; Adults use lungs Descendants of ancestral organisms that evolved some, not all,
adaptations for life on land First appeared 360 million years ago External fertilization Closed circulatory system; three chambered heart
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Section 30-3
Adult FrogAdult Frog
Young FrogYoung Frog
Fertilized EggsFertilized Eggs
TadpolesTadpoles
Adults are typically ready tobreed in about one to two years.Adults are typically ready tobreed in about one to two years.
Frog eggs are laid in water andundergo external fertilization.Frog eggs are laid in water andundergo external fertilization.
The eggs hatch into tadpoles a few days to several weeks later.
The eggs hatch into tadpoles a few days to several weeks later.
Tadpoles gradually grow limbs, lose their tails and gills, andbecome meat-eaters as they develop into terrestrial adults.Tadpoles gradually grow limbs, lose their tails and gills, andbecome meat-eaters as they develop into terrestrial adults.
The Life Cycle of a Frog
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that allow for
are
that providethat allow
are
and have special adaptations such as
larvæ they live in adults they live on
Section 30-3
means
as
Efficientmovement
Breathingair
Support andprotection
Bones Lungs Ribs
Amphibians
Water Land
“Double life”
Amphibians
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Groups of Amphibians
Salamanders – – Long bodies and tails– Adults are carnivorous– Usually live in moist woods
Frogs and Toads – – Lack tails– Frogs have long legs and are usually tied to water– Toads have shorter legs and not as closely tied to water
Caecilians –– Legless animals that burrow in moist soil– Have fishlike scales
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Spotted Salamander
Poison Dart Frog
Fire Bellied Toad Caecilian
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Reptiles – Basic Facts
All reptiles have:– Dry, scaly skin – helps prevent loss of body water in dry
environments– Terestrial eggs – first animals to develop amniotic eggs that
didn’t need to be deposited in water Respire using lungs Internal Fertilization; Most are egg-laying Ectotherms – cannot internally regulate body temperature;
cannot live in cold climates Behavior controls body temp. (swimming, burrowing, basking,
etc.) Closed circulatory system; double loop; Heart = two atria/one or two ventricles
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Amniotic Eggs
Top- Embryo
Egg Shell
Chorion
Allantois
Yolk
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Groups of Reptiles
Turtles – Shells– Beaks (no teeth)
Lizards and Snakes (Squamates) – Shed Skin– Jointed jaws/ skulls
Crocodilians– Large Snout- Big teeth– Powerful tail – Semi-aquatic
Tuataras– Only 2 species (New Zealand)- most have become extinct
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Coral Snake Sea Turtle
Galapagos Tortoise
Iguana
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Nile Crocodile
North American Alligator
Tuatara
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Birds – Basic Facts
Nearly 10,000 modern bird species Birds are closely related to reptiles (scales on legs) Have outer covering made of feathers, two legs used for
walking or perching, and forelimbs modified into wings Feathers separate birds from all other animal species Feathers provide insulation for warmth; can generate on body
heat Hollow bones- lighter for flight Beak/Bills adapted to type of food they eat Highly efficient respiratory system; lungs only exposed to
Oxygen rich air Internal fertilization; amniotic eggs; many mate for life
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Bird Groups
Neorinthes (Modern birds) have 27 Orders of different bird groups (ex: ducks, grouse, pigeons, pelicans, hawks, hummingbirds, owls, woodpeckers, and perching birds, etc.)
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Section 31-2
which are that also that power that provide that ensure
have the followingadaptations to flight
Birds
Homologous tofront limbs in other
vertebrates
Providewarmth
Upward anddownward wing
strokes
One-way flowof O2-rich air
O2 distributionto body tissues
Wings FeathersStrong chest
muscles
Efficientrespiratory
system
Efficientcirculatory
system
Bird adaptations
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Wings & Feathers
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Purple Finch
Red-Tailed Hawk
Stork
Emu
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Mammals – Basic Facts
First true mammals appeared 220 million years ago Mammals flourished after dinosaurs became extinct – 65
million years ago Basic characteristics
– Hair– Mammary glands – produce milk to nourish young– Breathe air– Four chambered heart– Endotherms – can generate own body heat– Internal fertilization; care for young
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Mammal Groups
Monotremes– Lay eggs– Duck-billed platypus and anteater
Marsurpials– Birth live young and develop in a pouch– Kangaroos, koalas, opposums, etc.
Placentals– Young fully develop inside mother– Nourished by a placenta
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