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Excavata. By Max Barsh (not really) Colm O’Toole Mike Maldonado. Cladogram. Excavata’s are put into different subgroups by their differences in the structure and presence of a specific rod inside their flagella. Characteristics. Eukaryote Lacks “classic” mitochondria

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excavata

Excavata

By

Max Barsh (not really)

Colm O’Toole

Mike Maldonado

cladogram
Cladogram
  • Excavata’s are put into different subgroups by their differences in the structure and presence of a specific rod inside their flagella.
characteristics
Characteristics
  • Eukaryote
  • Lacks “classic” mitochondria
    • Could be tubular, discoid, or NONE
  • Have “excavated” groove on one side of cell body
  • Between two, four or more flagella
  • Ventral feeding with characteristic ultra-structure
  • Many are free-living but some are symbiotic or parasitic
euglena
Euglena
  • Photosynthesizes (contains chlorophyll)
  • Found in fresh and salt waters
  • Can vary between parasites (kinetoplastids) or photosynthetic autotrophs (Euglenids!)
  • Can cause Chagas’ disease, which leads to heart failure
diplomonad
Diplomonad
  • Has modified mitochondria
  • Lacks a Golgi Apparatus
  • Causes Giardiasis, a harmful immune-system disease that only inhabits the intestines of mammals
  • Two equal-sized nuclei
  • HARMFUL
oxymonad
Oxymonad
  • Protozoasfound in intestines of termites
  • Have symbiotic bacteria responsible for breaking down cellulose
  • Lack a mitochondria
  • HELPFUL
evolutionary evidence
EVOLUTIONARY EVIDENCE
  • The presence of the modified mitochondria is evidence that evolution took its toll on the Excavatasupergroup
  • Other evidences include:
    • Varying flagella
    • Diplomonads lack an electron transport chain and have two nuclei
    • Parabasalids have a modified organelles that release Oxygen as a byproduct.
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