chordata,hemichordata

Card Set Information

Author:
tanyalequang
ID:
311745
Filename:
chordata,hemichordata
Updated:
2015-11-19 01:14:58
Tags:
bio122 bryne
Folders:
biology
Description:
chordates and their kin
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  1. What are the fur traits that all chordates share at some stage in their life?
    • notochord
    • dorsal hollow nerve chord
    • pharyngeal gill slits
    • post anal tail
  2. describe the function of the notochord
    • serves as a point of axis for embryonic development. Made out of tissues from the mesoderm.
    • The notochord is located next to the spinal cord.
    • In humans the notochord developed into the symbiotic disc between vertebrates
  3. Phylum and Organisms
    • Hemichordata
    • Acorn Worm
  4. Why are acorn worms not considered Chordates?
    They do not have a post anal tail. The post anal tail would get in the way when siphoning debris in one end and out the other.
  5. What organism rests in a U-shaped burrow
    Acron worm
  6. Phylum and Organism
    Cephalochordata, Lancelets
  7. What distinguishes a Lancelet?
    Lancelets do not have a skeleton or a skull, they are the first organisms in the Chordata phylum to exhibit muscle segmentation.
  8. Phylum and Organism
    Urochordata, Tunicate
  9. The tunicate does not exhibit these Chordata traits when it reaches adulthood
    • dorsal hollow nerve chord
    • post anal tail
    • notochord
  10. What is the distinguishing feature of Agnathas and name some organisms
    • they are jawless fishes that have no skull.¬†They are also called craniates.
    • Lamreys and Hagfish
  11. What class are hagfish
    Myxini
  12. What class are lamreys
    Petromyzontida
  13. What class are cartilaginous fish
    Chondrichthyes
  14. What class are bony fish
    Osteichythes

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