A symbiotic green alga, Pedinomonas symbiotica sp. nov. (Prasinophyceae), in the radiolarian Thalassolampe margarodes

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Abstract
A small green flagellate living in the jelly surrounding the capsule of the radiolarian T. margarodes, is described after a study of its fine structure. It occurs regularly at Villefranche-sur-Mer, on the French Mediterranean coast, constantly associated with Thalassolampe. The characteristic asymmetric body, the single flagellum, the occurrence of a 2nd flagellum before cell division, the bright green chloroplast and the presence of starch around the pyrenoid, allow it to be placed in the genus Pedinomonas (Prasinophyceae) as a new species, P. symbiotica.