EESC04H3 Lecture Notes - Lecture 6: Rhizaria, Excavata, Amoebozoa
14 Dec 2016
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Lab 6 summary: kindom: protozoa, supergroup: excavata. Excavata belong to the domain of eukaryota, they are a supergroup of protists that include diplomonads, parabasalids and euglenozoans. Many types of organisms in this supergroup are parasitic, photosynthetic, symbiotic and heterotropic. Excavata are unicellular organisms, many excavata have amoeboid morphology and are anaerobes. Many excavata are amitochondriate, meaning they lack mitochondria, therefore suggesting an archaic premitochondria ancestor of eukaryotes. Excavata has a ventral groove that is supported by complex microtubular roots, which works as a cytostome. Most excavataes have 2 or more flagellas. Excavata are considered to be the oldest members of flagellated organisms. Excavata are classified into 6 major subdivisions at either the phylum or class level: kindom protozoa, supergroup: rhizaria. Rhizaria are a supergroup of protists that are typically amoebas, they are often characterized by the presence of needle-like pseudopodia, that are used for distributing nutrients and oxygen or for locomotion.
