Return of the Invertebrates

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  1. phylum Ectoprocta
    • Colonial animals
    • – Encased in exoskeletons
    • – Reef builders
    • – Marine and fresh water
    • – “Bryozoans”
  2. phylum Brachiopoda
    • “Lamp shells”
    • Resemble clams
    • –Shells are dorsal/ventral not lateral like molluscs
    • Marine habitat
  3. phylum Mollusca
    • Mostly marine but also fresh water and terrestrial
    • Most secrete a hard shell made of calcium carbonate
    • –Some have an internal shell
    • –Some have no shell
    • Coelomates
    • Three main body parts
    • muscular foot, mantel- fold of tissue over visceral mass creating the visceral cavity and secretes the shell, radula the rasping feeding organ
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    mollusc body plan
  5. class Polyplacophora
    • Chitons
    • –Shell divided into 8 plates
    • –Intertidal marine habitat
    • –Consume algae with radula
    • scrapes algae off rocks with radula
  6. class gastropoda
    • Largest class of molluscs
    • Marine, freshwater and terrestrial
    • Torsion in development rotates the visceral mass around so the anus is left near the head
    • Many gastropods are hermaphroditic
  7. Class Bivalvia
    • Shell divided in two
    • No distinct head
    • No radula
    • Some have eye spots
    • Gills for gas exchange
    • Filter or suspension feeders
  8. class Cephalopoda
    • Predators
    • –Well developed sense organs
    • –Complex brains
    • Beak-like jaws tear prey
    • –Some are poisonous
    • Closed circulatory system
    • Most do not have shells
    • –Nautilus spp. are the exception
  9. Cephalopods can change?
    • Can change color very quickly by neural control
    • A set of organs control color changes
    • chromatophores are organs that allow the organism to change colors by distorting the cytoelastic sacculus(a sac containing the pigments) changing the translucency or reflectivity of the cell
    • –Photophores .
    • These can be as complex as a mammalian eye
  10. photophores
    are organs that allow bioluminescent light to shine from the organism
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  12. humboldt squid
    • Large squids (up to 2 meters)
    • Swim and hunt in shoals of up to 1200 individuals
    • Attack humans
    • Range expansion all the way to Alaska
  13. phylum Annelida
    • christmas tree worms
    • Segmented worms
    • Marine, freshwater and damp terrestrial habitats
    • Coelomates
  14. class Oligochaeta
    • Oligos–few; chaite–long hair
    • Earthworms and aquatic species
    • Improve soils for farmers
    • Hermaphroditic –cross fertilize
    • Some can asexually reproduce
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    earthworm anatomy
  16. polychaeta
    • –Free living–Mostly marine habitat
    • –Parapodia are ridge
    • -like structures that are used in locomotion
  17. hirudinea
    • –Leeches
    • Parasites, predators and detritivores
    • Mostly freshwater
    • Used medicinally to reduce blood after injuries and surgeries
  18. Ecdysozoa
    • Ecdysozoans are covered by a tough coat called a cuticle
    • The cuticle is shed or molted through a process called ecdysis
    • The two largest phyla are nematodes and arthropods
  19. phylum Nematoda
    • Habitats include water, soil, plant and animaltissues
    • Less than 1mm to more than 1m in length
    • No circulatory system
    • Alimentary canal
    • Most are separate sexes with females able toproduce 100,000 fertilized eggs per day
  20. Caenorhabditis elegans
    • well studies nematode
    • – Small number of cells (about 1000)
    • – DNA completely sequenced
    • Parasitic diseases
    • – Hookworm, Heartworm, Pinworm
    • Crop pests
Card Set:
Return of the Invertebrates
2013-04-01 17:48:04
Life 103

test 3
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