Abstract
A new dinoflagellate species within the benthic, heterotrophic, and thecate genus Amphidiniopsis was discovered in a fixed sediment sample taken at Cap Feret, France, in 1994. The cells within this sample were manually isolated and characterized by light and scanning electron microscopy. The thecal plate pattern and overall ornamentation demonstrate that this taxon is different from all other described species within the genus. Amphidiniopsis aculeata sp. nov. is dorsoventrally flattened, 37.5-40.3 μm long and 31.7-35.3 μm wide. The plate formula is APC 4′ 2a 7″ 3c 5s 5′″ 2″″. The thecal plates possess pores of two different size classes and are ornamented with conspicuous spines of different lengths.
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