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Knechtel, Johanna; Kretschmann, Juliane; Chacon, Juliana; Gottschling, Marc (2020): Dinastridium verrucosum Baumeister from Bavaria (Germany) is a Borghiellacean Dinophyte (Suessiales). In: Protist, Vol. 171, No. 4, 125741
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Phytodinialean dinophytes are poorly known at present and their phylogenetic relationships largely elusive. Historical names of microscopic species are frequently ambiguous, and a reliable application is impeded although crucial to fully explore the biology of organisms. We collected material close to the type locality of a historical species, namely Dinastridium verrucosum, and established eight strains for morphological and molecular studies. The motile cells showed an obovate shape in outline and were dorso-ventrally slightly flattened. They were orange-brown in colour and had a descending cingulum. In light microscopy, an eyespot was discerned in a few monadoid cells in the central region of the sulcus. Furthermore, a morphologically characteristic, 4-6 mu m long apical furrow was observed on the episome of the cells in SEM. Older cultivated material further exhibited coccoid cells of irregular shape, with wart-like protuberances and covered by a more or less extensive mucilage. This morphology is indistinguishable from the lectotype of D. verrucosum. In a molecular phylogeny, the species was placed in the Borghiellaceae (tSuessiales). As taxonomic result, we epitypify the historical name, D. verrucosum, and perform the necessary combination to Borghiella. (C) 2020 Elsevier GmbH. All rights reserved.