Reassessment of pore occlusion in some diatom taxa with re-evaluation of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) and description of two new genera
Andrei Mironov,
Anton Glushchenko,
Yevhen Maltsev,
Sergey Genkal,
Irina Kuznetsova,
John Patrick Kociolek,
Yan Liu,
Maxim Kulikovskiy
Affiliations
Andrei Mironov
College of Life Science and Technology, Harbin Normal University, Harbin, Heilongjiang Province, China
Anton Glushchenko
Laboratory of Molecular Systematics of Aquatic Plants, K. A. Timiryazev Institute of Plant Physiology RAS, Moscow, Russia
Yevhen Maltsev
Laboratory of Molecular Systematics of Aquatic Plants, K. A. Timiryazev Institute of Plant Physiology RAS, Moscow, Russia
Sergey Genkal
Papanin Institute for Biology of Inland Waters RAS, Borok, Yaroslavl Region, Russia
Irina Kuznetsova
Laboratory of Molecular Systematics of Aquatic Plants, K. A. Timiryazev Institute of Plant Physiology RAS, Moscow, Russia
John Patrick Kociolek
Museum of Natural History, Boulder, Colorado, United States
Yan Liu
College of Life Science and Technology, Harbin Normal University, Harbin, Heilongjiang Province, China
Maxim Kulikovskiy
Laboratory of Molecular Systematics of Aquatic Plants, K. A. Timiryazev Institute of Plant Physiology RAS, Moscow, Russia
In this article, the history and taxonomy of Placoneis gastrum, the type species of the genus Placoneis, was discussed. We investigated the structure of pore occlusions in Placoneis and related genera. As a result, we propose a new classification for tectulum-like types of pore occlusions. The new classification is congruent with previously-published and newly-constructed phylogenies based on molecular data. Based on the different structures of the pore occlusions, species of Placoneis are transferred to Witkowskia gen. nov. Hence, 168 new combinations are introduced. A new diatom species, with a similar morphology to Placoneis flabellata, was discovered in Bắc Kạn Province, Vietnam. It is described in this article as Chudaevia densistriata sp. nov. Placoneis flabellata is transferred to Chudaevia gen. nov. We also illustrate Placoneis flabellata herein and compare it to Chudaevia densistriata sp. nov. An unknown diatom, similar to Placoneis coloradensis, was discovered in Chukotka, Russia. It is introduced as Placoneis elinae sp. nov. below. Additionally, we discuss the distribution of some species of Witkowskia gen. nov. and Chudaevia gen. nov.
