Excavata
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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

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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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