Description of Trichonymphida
provided by BioPedia
Hypermastigids bilaterally symmetrical sometimes with a superimposed tetraradiate symmetry. Body composed of rostral and post-rostral zones. Rostrum divided into two hemi-rostra and terminated by an anterior cap. The internal rostral structures are cleaved or well separated by a band of cytoplasm free of flagella. Each hemi-rostrum comprises a set of privileged basal bodies, a flagellar area, a parabasal lamina and fibres, a set of axostylar fibres, and an atractophore. The post-rostral region is bare or flagellated, and flagella are arranged in meridional lines, concentric circles, or spiral lines. Axostylar and parabasal filaments originating in the rostrum penetrate into the post-rostral part of the cytoplasm. Dictyosomes are generally supported by the parabasal fibres or disseminated in the cytoplasm.
