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Abstract
Examination of the interior of the partectal ring of Mastogloia lanceolata with the scanning electron microscope reveals a complex architecture, equivalent to one described two decades ago for Mastogloia grevillei using transmission electron microscopy. Partectal ducts are present in the uppermost portion of the wall of the partectal ring. A finely porous siliceous cylinder runs longitudinally inside the ring, crossing the partitions of the latter in a position close to the partectal ducts; the new term intrapartectal cylinder is suggested for this structure.
