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14 Cards in this Set

  • Front
  • Back
What are the 4 Chordate Characteristics?
1. Notocord
2. Dorsal Hollow Nerve Cord
3. Pharyngeal Gill slits
4. post-anal tail
What is the Chordate Phylogeny?
Comparative anatomy and development. Similar to the Echinoderms
Evolution of a spinal column and braincase began at which stage?
Agnathous stage (jawless fish)
What is unique about the Urochordates (turnicates) larva and adult stages?
The larve ("tadpol") contains all 4 chordate characterists and is motile, whereas the adult is only left with the pharyngeal gills and is sessile.
How do Turnicates feed?
Filter feeding. H20 taken into the incurrent siphon enters the pharynx and passes through gill slits where food particles get trapped. The ENDOSTYLE in pharynx secretes mucus to trap the food particles and convey them to digestive tract.
Gill slits serve what function in turnicates?
Feeding function
What subphylum are Amphixious?
Which class of Chordates is terrestrial adults but aquatic larva? (tadpol)
Class Amphibia
What is true terrestriality?
The reptilian stage and the amniotic egg
how can you distinguish the difference b/t Osteichthyes and Chondrichthyes?
Osteichthyes has a homaceral tail.
Chondrichthyes has heteroceral tail.
How many classes of SubPhylum Vertebrata are there? Name them and the # Chambered heart
1. C. Agnatha (2)
2. C. Chondrichthyes (2)
3. C. Osteichthyes (2)
4. C. Amphibia (3)
5. C. Reptilia (3)
6. C. Aves (4)
7. C. Mammalia (4)
Name the characteristics of Deuterostomes.
Give example of Phyla
*"2nd Mouth": mouth formed by a 2nd opening of the embryo at the opposite end from the blastopore.
* Mesoderm formed by budding of pouches from archenteron.
*Indeterminate development
(cell fate not det. early)
*Radial Cleavage
*Enterocoelous ("intestine coelom")
P. Echinodermata; P. Chordata
Name the characteristics of Protostomes.
Give example of Phyla
*"1st Opening": mouth originates during embryonic development.
* Mesoderm forms from single cell of blastula
* Determinate dev. (cell fate determined early)
* Spiral Cleavage
* Schizocoelous ("Split Coelom")
P. Annelida; P. Arthropoda, P. Mollusca, Lophophorates
What Chordate Characteristics do Cephalochordates (Lancelets) have?
Cephalochordates have a notochord and a nerve cord but no vertebrae