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The boreal Atlantic Ocean is characterized by its limited number of Polycystine radiolarian species, about 70 in total. The taxonomy and ontogeny of all the Actinommida species in these waters are discussed and the following species illustrated: Actinomma boreale, Actinomma leptoderma leptoderma (emended), A. leptoderma longispina n. subsp., A. trinacria (emended) and Drymyomma elegans. A key to the boreal Atlantic Ocean Actinommida is provided.
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Cortese et al. (1998) studied this question.
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