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Rediscovery of the gonyaulacoid dinoflagellate Schuettiella

Rediscovery of the gonyaulacoid dinoflagellate Schuettiella The Gonyaulacales includes some of the most intensely investigated genera of harmful dinoflagellates. The knowledge of the evolutionary relationships is necessary, but incomplete because genera such as Schuettiella have not been studied by contemporary methods. The morphology and molecular phylogeny of type species of the genus Schuettiella, S. mitra, have been investigated from Brazil. The first scanning electron micrographs reveal a distinctive thecal ornamentation with sunken stripes and rows with exclamation mark‐shaped pores in the postcingular plates. The Kofoidean plate formula Po, 2′, 1a, 6″ is re‐interpreted as Po, 3′, 1a, 5″, after considering the narrow mid‐ventral plate as homologous to the first apical plate, although it does not reach the apex. In the rRNA gene phylogenies, the sequences of S. mitra clustered as an independent lineage closely related to the globular and planktonic Protoceratiaceae (Ceratocorys, Pentaplacodinium, Protoceratium) and the laterally compressed benthic genus Carinadinium (formerly Thecadinium). Schuettiella and Carinadinium are considered members of the Protoceratiaceae. The possession of a single anterior intercalary plate is an apomorphic trait of this family. This reinforces the value of the number of intercalary plates as a diagnostic character for the classification of the gonyaulacalean families despite the differences in the general appearance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Eukaryotic Microbiology Wiley

Rediscovery of the gonyaulacoid dinoflagellate Schuettiella

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References (34)

Publisher
Wiley
Copyright
© 2022 International Society of Protistologists
ISSN
1066-5234
eISSN
1550-7408
DOI
10.1111/jeu.12920
Publisher site
See Article on Publisher Site

Abstract

The Gonyaulacales includes some of the most intensely investigated genera of harmful dinoflagellates. The knowledge of the evolutionary relationships is necessary, but incomplete because genera such as Schuettiella have not been studied by contemporary methods. The morphology and molecular phylogeny of type species of the genus Schuettiella, S. mitra, have been investigated from Brazil. The first scanning electron micrographs reveal a distinctive thecal ornamentation with sunken stripes and rows with exclamation mark‐shaped pores in the postcingular plates. The Kofoidean plate formula Po, 2′, 1a, 6″ is re‐interpreted as Po, 3′, 1a, 5″, after considering the narrow mid‐ventral plate as homologous to the first apical plate, although it does not reach the apex. In the rRNA gene phylogenies, the sequences of S. mitra clustered as an independent lineage closely related to the globular and planktonic Protoceratiaceae (Ceratocorys, Pentaplacodinium, Protoceratium) and the laterally compressed benthic genus Carinadinium (formerly Thecadinium). Schuettiella and Carinadinium are considered members of the Protoceratiaceae. The possession of a single anterior intercalary plate is an apomorphic trait of this family. This reinforces the value of the number of intercalary plates as a diagnostic character for the classification of the gonyaulacalean families despite the differences in the general appearance.

Journal

The Journal of Eukaryotic MicrobiologyWiley

Published: Jul 1, 2022

Keywords: Carinadinium; Ceratocorys; Dinophyceae; Gonyaulacales; molecular phylogenetics; Pentaplacodinium; Protoceratium

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