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Is Chromista a polyphyletic Kingdom?
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Chromista is a proposed but polyphyletic biological kingdom, refined from the Chromalveolata, consisting of single-celled and multicellular eukaryotic species that share similar features in their photosynthetic organelles . It includes all eukaryotes whose plastids contain chlorophyll c and are surrounded by four membranes.
The name Chromista means "colored", and although some chromists, like mildews, are colorless, most are photosynthetic. Even though they are photosynthetic, chromists are not at all closely related to plants, or even to other algae. Unlike plants, the Chromista have chlorophyll c, and do not store their energy in the form of starch.
Sep 5, 2017 · Chromista is one of five eukaryotic kingdoms recognised in a comprehensive seven-kingdom classification of life (Ruggiero et al. 2015). As here critically reassessed, Chromista comprise eight distinctive phyla, not just three as in the first substantial systematic treatment 30 years ago (Cavalier-Smith 1986 )—5 years after Chromista was ...
- Thomas Cavalier-Smith
- 2018
overview. data. media. articles. names. English. Chromista. provided by wikipedia EN. Chromista is a proposed but possibly polyphyletic [1] [2] biological kingdom consisting of single-celled and multicellular eukaryotic species that share similar features in their photosynthetic organelles ( plastids ). [3] .
The seventh kingdom: Chromista The brown algae are a member of the kingdom Chromista. By 1981, Cavalier-Smith had divided all the eukaryotes into nine kingdoms. In it, he created Chromista for a separate kingdom of some protists. Most chromists are photosynthetic. This distinguishes them from most other protists which lack photosynthesis.
Life History and Ecology. Members of the Chromista are almost all aquatic organisms. These may occur, however, in both freshwater and marine environments. The Phaeophyta, for example, are primarily known for their large marine kelps, but the group also includes microscopic freshwater species. Likewise the diatoms have many marine and freshwater ...
The Chromista appear to represent an independent evolutionary line that diverged from the same common ancestor as plants, fungi, and animals. It was for this reason that the new kingdom Chromista was proposed. The precise relationship of the chromists to the other eukaryotes is not yet known, but they appear to be part of the so-called "crown ...
