22 terms

Ch 25: The Origin and Diversification of Eukaryotes

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Terms in this set (...)

Protist
Unicellular Eukaryotes
Plastid
General term for chloroplasts and related organelles
Excavata
One of four supergroups of eukaryotes. Have unique cytoskeletal features, and some species have an "excavated" feeding groove on one side of the cell body.
Diplomonads and Parabasalids
Protists that have reduced mitochondria, and include many parasites such as Giardia and Trichomonas. Subgroup of Excavata.
Euglenozoans
Diverse clade of protists that include heterotrophs, photosynthetic autotrophs, and parasites. Distinguished by the presence of a rod inside their flagella. Subgroup of Excavata
SAR
One of four supergroups of eukaryotes. Contains a large, extremely diverse collection of protists from three major subgroups: stramenopiles, alveolates, and rhizarians.
Stramenopiles
Subgroup of SAR that conduct the most photosynthesis of any protist group. Includes Diatoms and Brown Algae
Diatoms
A unicellular photosynthetic alga with a unique glassy cell wall containing silica. Among the most abundant photosynthetic organisms in oceans and lakes Member of the Stramenopile clade.
Brown Algae
One of a group of marine, multicellular, autotrophic protists, the most common type of seaweed. Includes the kelps. Member of the Stramenopile clade.
Alveolates
Subgroup of SAR that have alveoli (membrane sacs). Includes Dinoflagellates, Ciliates, and Rhizarians.
Dinoflagellates
Plant-like protist that causes red tide. Type of Alveolate.
Mixotrophs
Organisms that combine photosynthesis and heterotrophic nutrition
Ciliates
A group of protists that move by waving tiny, hair-like organelles called cilia. Most are predators. Type of Alveolate.
Rhizarians
Includes many amoebas (protists that use pseudopodia to move and feed).
Forams (foraminiferans)
An aquatic protist that secretes a hardened shell containing calcium carbonate and extends pseudopodia through pores in the shell. Type of Rhizarian.
Cercozoans
Large group of amoebas that feed with thin, thread-like (not thick, tube-like) pseudopodia. Are often parasites or predators. Subclass of Rhizarians.
Archaeplastida
The supergroup that includes red algae, green algae, and land plants
Red Algae
Marine can live at depths over 260 meters. Edible as nori. Member of Archaeplastida.
Green Algae
Photosynthetic protists that include unicellular, colonial, and multicellular species with grass-green chloroplasts; closely related to true plants. Member of Archaeplastida.
Unikonta
One of four supergroups of. Consists of amoebozoans and opisthokonts.
Amoebazoans
Protists that all have lobed or tube-shaped pseudopodia (not thread-like). Usually heterotrophic. Includes slime molds and certain amoebas.
Opisthokonts
Diverse group that include animals, fungi, and several groups of protists. Member of Unikonta.