A light and electron microscopic study of Scherffelia dubia, a new member of the scaly green flagellates (Prasinophyceae)

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<jats:p>In clonal culture <jats:italic>Scherffelia dubia</jats:italic> (Perty) Pascher shows a considerable range of morphological variation, with different cell shapes being produced including those typical for three other species of <jats:italic>Scherffelia</jats:italic> Pascher (<jats:italic>S. opisthostigma</jats:italic> Skuja, <jats:italic>S. ovata</jats:italic> Pascher, <jats:italic>S. pelagica</jats:italic> Skuja) and one species of <jats:italic>Tetraselmis</jats:italic> Stein (<jats:italic>T. bichlora</jats:italic> Ettl & Ettl). It is concluded these taxa should be reduced to the synonymy of <jats:italic>S. dubia</jats:italic>, the type species of <jats:italic>Scherffelia.</jats:italic> The general cell morphology of <jats:italic>S. dubia</jats:italic> is described in detail, including a serial section and absolute configuration analysis of the flagellar apparatus. <jats:italic>S. dubia</jats:italic> is compared with species of <jats:italic>Tetraselmis</jats:italic> of which ultrastructural details are known and it is shown that both genera are very similar but the generic distinction is nevertheless justified. Main features of distinction include the pyrenoid (present in <jats:italic>Tetraselmis</jats:italic> but lacking in <jats:italic>Scherffelia</jats:italic>) and the chloroplast (single and more or less cup‐shaped in <jats:italic>Tetraselmis</jats:italic>, two separate lateral chloroplasts in <jats:italic>Scherffelia</jats:italic>). Both genera are accommodated in the same family, the correct name being Chlorodendraceae and not Tetraselmidaceae or Platymonadaceae which have often been used.</jats:p>

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