Exsert
From dinoflaj2
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A term for the plate configuration in gonyaulacaleans where the first apical homologue (1u) does not contact the apical pore complex and where the fourth and second apical homologues (A/B) and the fourth apical homologue and the first precingular plate (A/2) are in contact. Refer to Text-Figure 63. See also insert and metasert.