deuterostomes and chordates 1 biol 1407. deuterostomes phylum echinodermata –sea stars, sea...

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  • Deuterostomes andChordates 1BIOL 1407

  • DeuterostomesPhylum EchinodermataSea stars, sea urchins, sea cucumbers, crinoidsPhylum ChordataTunicates, lancelets, fishes, amphibians, reptiles, birds, mammals

  • Phylum Echinodermata

  • Phylum EchinodermataLarvae: bilateral symmetryAdults: pentaradial symmetryPhoto credit of pluteus larva: NOAA, 2001Photo credit of adult brittle star: Larry Zetwoch, 1989, Florida Keys National Marine Sanctuary, NOAA

  • Water Vascular SystemUniqueHydraulic system used for feeding and locomotionVideo of tube feet: Credit: Dr. James P. McVey, NOAA Sea Grant Program

  • Phylum Chordata

  • Characteristics of ChordatesBilateral symmetryTriploblasticCoelomateSegmented

  • Other Chordate CharacteristicsComplete Digestive SystemClosed Circulatory SystemRespiratory System: Gills or LungsExcretory System: KidneysCentralized Nervous System

  • Unique Chordate Characteristics

  • Phylum Cephalochordata:Lancelets

  • Phylum Urochordata:Tunicates

  • Major Chordate CladesCraniates: CraniumVertebrates + HagfishesVertebrates: Vertebral ColumnGnathostomes: Jaws & Paired AppendagesOsteichthyans: Lung/Lung DerivativesLobe-finned Fishes: Limb Bone PatternTetrapods: Four Well-Developed LimbsAmniotes: Amniotic Egg

  • HagfishesCraniatesHeadSimple craniumNot vertebrates

  • Characteristics of VertebratesVertebral ColumnWell-developed skullPhoto Credit of Hippo skull: Raul654, 2005, Wikimedia Commons

  • Photo Credit for Platypus Skeleton at Melbourne Museum: Peter Halasz, 2006, Wikimedia Commons

  • LampreysVertebratesNo jaws or paired appendages

  • Evolution of Jaws

  • ChondrichthyesCartilaginous skeletonJaws PresentPaired Appendages

  • OsteichthyansBony SkeletonLung and Lung Derivatives Two Main Groups:Ray-finnedLobe-finned

  • Ray-Finned FishesFins are supported by fin raysSwim bladdersLargest vertebrate group

  • Lobe-Finned VertebratesFins and limbs supported by internal bones and muscles

  • Lobe-Fin PatternPhoto Credit: Courtesy of Dennis Murphy, Devonian Times,

  • Video of Fish with Fingers:

  • The EndUnless otherwise specified, all images in this presentation came from:Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.


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