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Dictyocha fibula Ehrenberg, 1839. Silicoflagellate with siliceous skeleton (basal ring) with four sides, but without the apical ring. Spines project from the corners of the outer hexagon, internal projections form irregular connections. Bars also arise inwards and may fuse to form a central arch. The cytoplasm extends over the skeleton, fine pseudopodia usually project from the tops of the spines. Many small plastids, single emergent flagellum. Mostly 30-80microns Marine
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Dictyocha fibula longispina Lemmermann, 1901. Silicoflagellate with siliceous skeleton (basal ring) with four sides, but without the apical ring. Spines project from the corners of the outer hexagon, internal projections form irregular connections. Bars also arise inwards and may fuse to form a central arch. The cytoplasm extends over the skeleton, fine pseudopodia usually project from the tops of the spines. Many small plastids, single emergent flagellum. Radial spines of the basal ring of equal length, approx. 12-15 microns long. Basal ring 23-27 microns Marine.
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Dictyocha fibula messanensis (Haeckel) Lemmermann, 1901. The silica skeleton consists of a four-side basal ring (20-30 microns) with a tapered radial spine (15-22 microns) at each of the angles. On the sides of each strut forming the basal ring are small abapically directed protuberances. Four supporting bars project from the basal ring and join with a short bar. Marine.
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Dictyocha fibula hexagona Marshall, 1934. Silicoflagellate with siliceous skeleton (basal ring) with six major sides like Distephanus, but without the apical ring. Spines project from the corners of the outer hexagon, internal projections form irregular connections. Bars also arise inwards and may fuse to form a central arch. The cytoplasm extends over the skeleton, fine pseudopodia usually project from the tops of the spines. Many small plastids, single emergent flagellum, reported from the Great Barrier Reef, maximum width 86 microns
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A silicoflagellate & its skeleton: from a Lugol's-fixed sample taken in the NW Med in October.