Our friends the invertebrates

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  2. look at diagram
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    sponge anatomy
  4. most sponges are
    • hermaphrodites 
    • usually sequential Gametes come from choanocytes or ameobocytes
  5. sponge reproduction
    • Eggs stay in mesophyl
    • Sperm are released from sponge and enter other sponges via pores
    • Larvae are free swimming –settling on suitable substrate and then developing into adults
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    • Cnidarians
    • (ignore staurozoa)
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    polyp and medusa
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    Hydro Cnidocyte
  9. hydrozoans
    • –Polyp stage more conspicuous
    • –Fresh water and marine habitats
    • –Can reproduce by budding

  10. scyphozoans
    • –Medusa is the obvious stage
    • –Pelagic species lack a polyp stage
    • –Most are jellies

  11. Portuguese Man o' War
    • Each is composed of 4 types of individuals (both medusa and polyp)
    • –Individual types have specialized functions
    • colony rather than one organism

  12. Cubozoans
    • –Box shaped medusa
    • –Complex eyes
    • –Highly toxic cnidocytes

  13. Anthozoans
    • –Medusa stage is absent
    • –Most are sessile
    • –Sea Anemones and Corals

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    Obelia life cycle
  15. Clade Lophotrochozoa
    • Molecular data distinguished members of the clade
    • Highly diverse body forms
    • Six phyla in the clade
  16. clade Bilateria contains what 3?
    • Lophotrochozoa, Ecdysozoa, and Deuterostomia
    • Some develop a lophophore for feeding, others pass through a trochophore larval stage, and a few have neither feature
  17. phylum Platyheminthes -Flatworms
    • Marine, Freshwater and damp terrestrial
    • Triploblastic acoelomates
    • Water and gas exchange by diffusion
  18. Turbellarians
    • Generally free living and found in marine habitats
    • –Planarians
    • –Some reproduce asexually by fission (split in 2)
    • –Hermaphrodites
    • •Mates fertilize each other
    • ( platyheminthes)
  19. Monogeneans and Trematodes
    • –Parasites (both in and on hosts)
    • –Monogeneans
    • •Most are parasitic on fish
    • –Trematodes
    • •Complex life cycle
    • •Sexual and asexual stages
    • •Some reproduce asexually by fission
    • •Hermaphrodites
    • –Mates fertilize each other
    • (platyheminthes)
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    Planarian anatomy
  21. Cestoidea
    • parasitic
    • tapeworms
    • (platyheminthes)
  22. phylum Rotifera
    • Fresh water, marine and damp terrestrial habitats
    • Alimentary Canal
    • –Separate mouth and anus
    • Many reproduce by parthenogenesis
  23. parthenogenesis
    a form of reproduction in which the ovum develops into a new individual without fertilization
  24. class Bdelloidea
    • Asexual
    • No males
    • –Limits on evolution and adaptations
    • Diverse–400+ species
    • Old–40-80 million years
    • (rotifers)
  25. Rotifers adaptions
    • Adaptations for survival
    • Suspended animation
    • –In harsh conditions the rotifer undergoes anhydrobiosis and becomes encysted
    • Incorporates DNA from the environment
    • –Rotifers have the DNA of bacteria and fungi
    • –May be incorporated during re-animation (repair of cell membranes
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Our friends the invertebrates
2013-04-01 17:11:01
Life 103

test 3
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