Some NorwegianDinophysisspecies (Dinoflagellata)

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Abstract
A revision of most of the classic species of dinoflagellates is urgently needed. In this paper the author carefully studied the following species of Dinophysis: D. odiosa Pavillard, D. acuta Ehren-berg, D. norvegica Claparède & Lachmann, D. acuminata Claparède & Lachmann, D. skagi Paulsen, D. dens Pavillard, and D. rotundata Claparède & Lachmann. It is the first tabular analysis of Norwegian Dinophysis. D. odiosa from Norwegian waters perfectly agrees with the description by Tai & Skogsberg and Norris & Berner, but shows some significant differences from Pavillard's description, which makes the identification dubious. D. acuta and D. norvegica are very close relatives; they differ somewhat in shape, size, and left sulcal list: their most significant tabular differences are in their S.p. plates. The author restores the name acuminata for both D. lachmanni and D. borealis and expresses his belief that D. boehmi from the South Atlantic is the same species. D. skagi is based on very scarce material: it is not separable from D. acuminata on the basis of plate analysis and their differences in shape are small. Typical D. rotundata from North European waters agrees perfectly with the species described by Balech (1971) as D. whittingae which may be different from D, whittingae Balech, 1967 (a name for Phalacroma rudgei Murray & Whitting).

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