Phylum Chordata - PowerPoint PPT Presentation

Phylum chordata l.jpg
Download
1 / 16

  • 591 Views
  • Updated On :
  • Presentation posted in: Pets / Animals

Phylum Chordata. Deuterostome development Dorsal hollow nerve cord from ectoderm Notochord Stiff rod between nerve cord & intestine Support for muscular movements Pharyngeal gill slits Slits allow water to escape before stomach Post-anal tail. Phylum Chordata. Subphylum Urochordata

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Download Presentation

Phylum Chordata

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Phylum chordata l.jpg

Phylum Chordata

  • Deuterostome development

  • Dorsal hollow nerve cord from ectoderm

  • Notochord

    • Stiff rod between nerve cord & intestine

    • Support for muscular movements

  • Pharyngeal gill slits

    • Slits allow water to escape before stomach

  • Post-anal tail


Phylum chordata2 l.jpg

Phylum Chordata

  • Subphylum Urochordata

    • Tunicates (sea squirts)

    • Sessile adults filter water with gill slits

    • Incurrent & excurrent siphons

  • Subphylum Cephalochordata

    • Lancelets

    • Mobile adults bury body in sand w/ mouth out

    • Filter-feed across gill slits


Subphylum vertebrata l.jpg

Subphylum Vertebrata

  • Cranium around brain

  • Cartilaginous or bony vertebrae around nerve cord

    • Except hagfishes

  • Diversity of vertebrates

    • Superclass Agnatha (hagfish & lampreys)

      • Jawless fish

      • Lack paired appendages

      • Cartilaginous skeleton

    • Superclass Gnathostomata (jawed mouth)


Vertebrata l.jpg

Vertebrata

  • Class Chondrichthyes (sharks, rays, & skates)

    • Cartilaginous fishes

    • Some are oviparous (release eggs)

    • Some ovoviviparous (release after hatching)

    • Some are viviparous (nourished by placenta)


Vertebrata5 l.jpg

Vertebrata

  • Class Osteichthyes

    • Bony fishes (ossified skeleton)

    • Ray-finned, Lobe-finned, & lung fishes

    • Ray-finned has most species

    • Gills covered by operculum

    • Swim bladder regulates buoyancy


Terrestrial vertebrates l.jpg

Terrestrial vertebrates

  • Class Amphibia

  • Amniotes

    • Class Reptilia

    • Class Aves

    • Class Mammalia


Class amphibia l.jpg

Class Amphibia

  • Tetrapod vertebrates

  • Ectothermic

  • Developing eggs & larva need aquatic environment

  • Gas exchange through skin, gills, lungs, &/or mouth

  • Orders

    • Order Anura (frogs & toads)

    • Order Urodela (salamanders)

    • Also caecilians


Amniotes l.jpg

Amniotes

  • Amniotic egg contains extra-embryonic membranes

    • Amnion: surrounds embryo

    • Allantois: for waste disposal

    • Yolk sac: stored nutrients for embryonic growth

    • Chorion: surrounds all these (exchanges gases)

  • Allow reproduction away from water


Class reptilia l.jpg

Class Reptilia

  • Internal fertilization

  • Leathery shelled amniotic eggs

    • Some have live birth (ovovivipary & vivipary)

  • No larval stage of development

  • Dry, scaly skin

  • Lung respiration

  • Nitrogenous waste is uric acid

  • Ectothermic


Class reptilia10 l.jpg

Class Reptilia

  • Order Testudines

    • Sea turtles, tortoises, & terrapins

  • Order Squamata

    • Lizards & Snakes

  • Order Crocodilia

    • Crocodiles, caimans, & alligators


Class aves l.jpg

Class Aves

  • Hard-shelled egg

  • Adapted for flight

  • Hollow bones

  • Endothermic

  • Air sacs in addition to lungs

  • No teeth (gizzard does grinding)

  • Feathers

  • Bipedal (forelimbs are wings)


Class aves12 l.jpg

Class Aves

  • 29 (or so) living orders with >8,500 species

  • Order Anseriformes (Ducks, geese, & swans)

  • Order Piciformes (Woodpeckers)

  • Order Falconiformes (Hawks, flacons, eagles)

  • Order Galliformes (Chickens, turkeys, etc.)

  • Order Passeriformes (songbirds)

    • Sparrows, finches, cardinals, mockingbirds, jays, crows, wrens, thrushes, etc


Class mammalia l.jpg

Class Mammalia

  • Endothermic

  • Hair

  • Mammary glands

  • Some oviparous (egg-laying)

    • Monotremes (platypus & echidna)

  • Most viviparous (nourished by placenta)

    • Marsupials

    • Eutherians


Class mammalia14 l.jpg

Class Mammalia

  • About 4,500 species in 20 orders

  • Order Monotremata (platypus & echidnas)

  • Order Marsupialia (opossums, kangaroo, koala, etc)

  • Order Chiroptera (bats)

  • Order Carnivora (lions & tigers & bears!, also weasels, dogs, raccoons, seals, etc)

  • Order Cetacea (whales, dolphins)

  • Order Rodentia (rats, squirrels, beaver, etc.)

  • Order Primates (lemurs, monkeys, apes, & you)


Order primates l.jpg

Order Primates

  • Prosimians (e.g. lemurs)

  • Old-world monkeys (non-prehensile tails)

  • New-world monkeys (prehensile tails)

  • Apes

    • Gibbons

    • Orangutans

    • Chimpanzees

    • Gorillas

    • Humans


Homonid evolution l.jpg

Homonid evolution

  • Bipedalism

  • Brain size

  • Reduction in sexual dimorphism

    • Perhaps with switch to monogamy

    • Extended parental care

  • Tool use

  • Split from other ape ancestor some 5-7 million y.a.

  • Diversified into Australopithecus and Homo


  • Login