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Deuterostomes and Digestive Systems Comparison

Explore the number of Deuterostomes, organisms with incomplete digestive systems, and the phyla/classes represented. Study the level of organization, symmetry, and body cavity development. Learn about common structures in different organisms.

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Deuterostomes and Digestive Systems Comparison

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  1. Comparison ?’s A.How many of the following organisms are Deuterostomes? B. Give the Letter(s) of all organism(s) with incomplete digestive systems. C. How many phyla/classes are represented here? Read Q’s carefully Compare traits and group Phyla when studying!!!

  2. Quick Review • Diploblastic- 2 Cell Layers • Triploblastic- 3 Cell Layers

  3. Quick Review • Diploblastic - 2 Cell Layers PhylumCnidaria • Triploblastic- 3 Cell Layers PhylumPlatyhelminthes onward…

  4. Level of Organization Acellular Cellular Unicellular or Multicellular Tissue Organ What level of organization do we see in Kingdom Protista?

  5. Level of Organization Cell(multi) - PhylumPorifera (unicellular) - Kingdom Protista Tissue- PhylumCnidaria Organ - PhylumPlatyhelminthesonward…

  6. Symmetry RadialWhere do we first see this? Bilateral And this? Pentaradial And this?

  7. Symmetry RadialPhylumCnidaria BilateralPhylumPlatyhelminthes onward… PentaradialPhylumEchinodermata except ………Holothuroidea which are secondarily bilaterally symmetrical

  8. Digestive Systems Incomplete (No anus) Can you name 2 phyla? Complete (Have an anus) Can you name 2 phyla?

  9. Digestive Systems Incomplete (No anus) PhylumCnidaria PhylumPlatyhelminthes If Q had been ‘Name 2 classes’….. Ophiuroidea & ? Complete (Have an anus) PhylumNemertina onward… (no anus in C. Ophiuroidea!)

  10. Body Cavity Acoelomates2 phyla Phylum Platyhelminthes Phylum Nemertina Pseudocoelomates2 phyla Phylum Nematoda Phylum Rotifera (Eu)Coelomates6 phlya Phylum Annelida Phylum Arthropoda Phylum Mollusca Phylum Bryozoa Phylum Echinodermata Phylum Chordata

  11. Coelom Development Schizocoelous (BAAM) PhylumBryozoaPhylumAnnelida PhylumArthropoda PhylumMollusca Enterocoelous PhylumEchinodermata PhylumChordata Endoderm, Ectoderm, Mesoderm, Coelom

  12. Protostomes(4 phyla) Protostomes, and Spiral cleavage, Schizocoelous, Determinate B “PaSSeDit!” (BAAM) APhylum Bryozoa MPhylum Annelida Phylum Arthropoda Phylum Mollusca

  13. Deuterostomes(2 Phyla) Radial cleavage, Enterocoelous Deuterostomes, Indeterminate “REDI” for anything! C PhylumEchinodermata PhylumChordata

  14. Study Ideas Make lists of structures for common purposes, and learn which organisms posses which structures: e.g. Book lungs, book gills, trachea, spiracles papulae, lungs & gills. e.g. Malpighian tubules, Renette glands, protonephridia, Flames cells/bulbs etc…. e.g. Statoblasts, gemmules, cryptobiotic eggs

  15. Be able to definethese terms and identify organisms that illustrate them • Cephalization Metamerizism • Tagmatization Homology • Serial Homology Polymorphism • Torsion Detorsion • Ecdysis This list is not exhaustive….add to it yourself!

  16. Memory tip! • Learn the exceptions to the rules, the oddities (I love to test on those!) Make sure you understand why they are tricky though Fire coral is NOT a coral….it has a medusa Turbellaria is the only free-living class in Platyhelminthes; other two are parasitic Ophiuroidea - no anus Holothuroidea - secondarily bilaterally symmetrical

  17. And finally… • Make a list of all of the unusual terms and structures you have come across and make sure you know where they fit in the “big picture.” Respiratory tree, mastax, trophi, trochus, septa, annulus, typhlosole, avicularia, crop, clitellum, gizzard, parapodia, acicula, proglottid, carapace, trochophore, ….. Sounds like a song from Nemo!

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