vertebrates
DESCRIPTION
Vertebrates. BIO 2215 Oklahoma City Community College Dennis Anderson. The Vertebrates. Subphylum Vertebrata. Vertebrae replace notochord during embryonic development. Fig. 48.8. Superclass Agnatha. No jaws No paired appendages Notochord as adult. Ostracoderms. Earliest vertebrate - PowerPoint PPT PresentationTRANSCRIPT
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Vertebrates
BIO 2215
Oklahoma City Community College
Dennis Anderson
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The Vertebrates
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Subphylum Vertebrata
• Vertebrae replace notochord during embryonic development
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Fig. 48.8
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Superclass Agnatha
• No jaws• No paired
appendages• Notochord as adult
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Ostracoderms
• Earliest vertebrate• Paleozoic era• Filter feeders
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Hagfish and Lamprey
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Class Cephalaspidomorphi
Lamprey
Parasites
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Class MyxiniHagfish
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Superclass Gnathostomata
• Jaws• Paired appendages
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Fig. 48.13
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Class CondrichthyesSubclass Elasmobranchii
• Cartilage skeleton• Notochord• No opercula• No swim bladder
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SqualusDogfish Shark
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DasyatusStingray
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Osteichthyes
• Boney fish• Not a taxon
– Formerly a class
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Class Actinopterygii
• Rays in fins• Bones• Operculum• Swim bladder
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Fish Scales
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Salmon
Pectoral Fin
Pelvic Fin
Anal Fin
Caudal Fin
Dorsal Fin Adipose Fin
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Migration Behavior
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Subclass DipneustiLung Fish
• Breathe air when lake or river dries up
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Class Sarcopterygii
• Coelacanth• Lobed fins
– muscles
Order Crossopterygii
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Gas exchange
• Gills– Ram Ventilation
• Skin• Mouth
– Gulp air
• Lungs
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Buoyancy• Sharks must constantly swim to
keep from sinking
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1% Salt
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Freshwater Fish
1% Salt
0% Salt Water
Salt
UrineAbsorb Salt
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Marine Fish
1% Salt
3.5% Salt Water
Salt
UrineSecrete Salt
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Reproduction
• Lay eggs in water
• Ovoviparous– Egg remains in mother until offspring hatch– The offspring are born alive
• Viviparous– Embryo receives nourishment from mother– The offspring are born alive
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Courtship Behavior
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Oklahoma Fish
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Longnose GarOrder Semionotiformes
Lepisosteus
• Ganoid scale• Long snout
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Channel CatfishOrder Siluriformes
Ictalurus
• Rounded anal fin
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Large Mouth BassOrder PerciformesMicropterus
• Large mouth• Upper jaw extends past the eye
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Small Mouth BassOrder PerciformesMicropterus
• Small mouth
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CrappiesOrder Perciformes
Pomoxis
• White crappie is not as dark as dark as the black crappie
• Eat crustacean and small fish
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Bluegill SunfishOrder Perciformes
Lepomis
• Small mouth• Oval shape• Eat crustaceans and insects
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CarpOrder Cypriniformes
• Large dorsal fin• Arched back• Omnivores
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Tetrapods
• Animals with 4 limbs– Amphibians– Reptiles– Birds– Mammals
• Evolved from fish
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Transition from Sea to Land
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•Coelacanth
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Eusthenopteron
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Panderichthys
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Tiktaalik
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Transitional TetrapodsSkull, teeth, limbs similar to lobe-
finned fish
IchthyostegaAcanthostega
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Amphibians
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Adaptations to live on land
• Gills are usually lost• Lungs function• Breathe through skin• Secrete mucus
– Prevent dehydration– Aids in respiration
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More Adaptations to live on land
• Skeleton – Fins evolve into limbs– Vertebral column
supports body underneath it
• Air is not as buoyant as water
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Evolution of Circulation
Fish Amphibian
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Class Amphibia
• Land and water– Reproduce in water
• Skin with mucoid secretions– Respiration
• No scales, feathers or hair
• Heart with 3 chambers– 2 atria– 1 ventricle
• One cervical vertebra• Ectothermic
(Piokelothermic)
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Order Caudata (Urodela)
• Salamanders• Long tail• Four legs
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Newt – Salamander With Rough Skin
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Paedomorphosis
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Order Anura
• Frogs and toads• No tail in adult• Webbed feet
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Family Plethodontidae
• No lungs• Breathes through skin
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Family Salamandridae
• Has lungs• True salamanders
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Toad
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Mating Calls
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Poison Dart Frogs
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Order Apoda (Gymnophiona)
• Caecilian• No legs• Skin glands• Live in tropics
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The End