Monday, June 13, 2022

Zoomastigophorea

Zoomastigophorea

Zoomastigophorea

A class of protozoa of the subphylum Sarcomastigophora. Zoomastigophorea, also known as Zoomastigina, are flagellates which have few or no characters relating them to the pigmented forms.

Some are simple, some are specialized; some have pseudopodia besides flagella, others have no pseudopodia. One group engulfs solid food at any body point; another shows localized ingestive areas. All are colorless. None produce starch or paramylum, and lipids and glycogen are assimilation products. Cells are naked or have delicate membranes. Colony formation is common. Colonies differ greatly in form and may be amorphous, linear, spherical, arboroid, or plane. Flagella vary from none to many. Nuclei generally have endosomes; frequently a rhizostyle extends from the nucleus to the flagelum base. Nutrition is holozoic, saprozoic, or parasitic, and encystment is common. Ecologically Zoomastigophorea are adapted to waters of relaively high organic content, but they occur in the clearest fresh waters and in the high seas. Nine orders are included in this class: the Choanoflagellda, Bicosoecida, Rhizomastigida, Kinetoplastida, Reortomonadida, Diplomonadida, Oxymonadida, Trichomonadida, and Hypermastigida. See articles on these orders.

See PROTOZOA; SARCOMASTIGOPHORA.

James B. Lackey

 

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