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Description of SticholoncheCircumscription: Marine protists with four rows of flattened mobile axopodia, which insert in ball and socket joints in the nucleus. Rowing motion of axopodia propels the cell. Also referred to as taxopodids. Ultrastructural identity: Mitochondria probably tubulocristate. Microtubules of axopodia with hexagonal packing, and with electron-dense basal ball located in a socket created of electron-dense material attached to outer face of nuclear envelope. Synapomorphy: Tubulocristate (?) eukaryotes with mobile axopodia with ball and socket insertion in nucleus. Composition: Two species.