Protista

-Unicellular, includes protozoa

Metazoa

-Multicellular, no “true” tissue: parazoa (sponges)

True tissue: Eumetazoa

  1. Diploblastic (mostly radially symmetric)
  2. Triploblasic (mostly bilaterally symmetric)

-Acoelomate

-Pseudocoelomate

-Coelomate (1.Protostomes 2.Deuterostomes)

 

Cladogram:
Screen Shot 2017-09-06 at 11.26.56 AM.png

Pleisomorphic (Primitive condition, ancestral state)

Apomorphic (derived condition, advanced character state)

Syanpomorphy (shared derived character)

In Cladistics, all members of a group (clade) should be monophyletic

Monophyletic-

  • All members of a taxonmic group are derived from a single ancestral form
  • the group that shares a common ancestor but does not contain all the descendants

Paraphyletic:

  • A group containing members that don’t share a common ancestor

Polyphletic:

  • A group containing members that dont share a common ancestor

Cladograms–

-lacks absolute time axis, cant tell what year things happened

-cant tell speciation events

-is a HYPOTHESIS, ideas amount evolutionary history change

-A PHYLOGENY DOES have a time axis

Parsimony-

-smallest # of evolutionary transformations

-least complex way of explaining relationships

-not a lot of losses and re-gaining characteristics

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