Order Peridiniales diagnosis
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| Citation: Peridiniales Haeckel 1894b. Diagnosis:Peridiniphycideans whose tabulation exhibits, or derives from, a pattern in which one or both of the following arrangements occurs: (a) the first apical plate is symmetrical, the left lateral triple junction or pair of left lateral triple junctions being essentially level with the right lateral triple junction or pair of right lateral triple junctions; (b) there are two antapical plates, placed more or less symmetrically about the midventral ( middorsal) plane. |