A New Member of the Mycetozoa

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Abstract
A new mycetozoan, Cavostelium apophysatum, has been described and is placed in a newly erected family (Cavosteliaceae) of uncertain relationship to other groups of mycetozoa. The vegetative phase alternates readily between amoeboid and flagellate stages. The latter are basically anteriorly uniflagellate, but at times biflagellate cells are common, and cells with three and four flagella have also been found, but without any tendency of flagella to be associated permanently in pairs. Single amoebae produce simple stalked sporangia, typically with one or two spores. The stalk is composed of two membranes, between which a gaseous inflation occurs when the fruiting body is submerged in water. A sexual process was not demonstrated. The organism is believed to have evolved independently from the Protozoa.

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