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Concept
Protosteliales
Summary
Protosteliomycetes/Protosteliales (ICBN) or Protostelea/Protostelia/Protosteliida (ICZN) is a grouping of slime molds from the phylum Mycetozoa. The name can vary depending upon the taxon used. Other names include Protostelea, Protostelia, and Protostelida. When not implying a specific level of classification, the term protostelid or protosteloid amoeba is sometimes used.
Protosteloid amoebae, also called protostelids, are amoebae that are capable of making simple fruiting bodies consisting of a cellular stalk topped by one or a few spores. All species are microscopic and are typically found on dead plant matter where they consume bacteria, yeasts, and fungal spores. Since protostelids are amoebae that make spores, they are considered to be slime molds.
It includes for example the following genera:
Cavosteliaceae (family)
Cavostelium (genus)
Planoprotostelium (genus)
Ceratiomyxaceae (family)
Ceratiomyxa (genus)
Protosteliaceae (family)
Protostelium (genus)
As a subclass, Protostelia has been described as paraphyletic to the protostelid clade, as Protostelia excludes the clade of myxomycetes, which are embedded in the protostelid clade.
The formal taxonomy of protosteloid amoebae groups them all according to fruiting bodies, mostly leaving out characteristics of the amoebae. Recent studies have shown that all protosteloid amoebae studied to date are probably included in the group known as Amoebozoa or Eumycetozoa. However, protosteloid amoebae are not all closely related and some fall within groups of amoebae in which the other amoebae are nonfruiting. Therefore, it appears that the ability to make fruiting bodies may have evolved more than once.
Protosteloid amoebae are typically found on dead plant matter, including stems and leaves of herbaceous plants, stems and leaves of grasses, bark of living trees, decaying wood and other types of dead plant matter. Protosteloid amoebae are found on dead plant matter that has fallen on the ground, on dead plant parts that are still hanging in the air and on dead parts of plants that are submerged in a pond.
Official source
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