Three new species of the diatom genus Hannaea Patrick (Bacillariophyta) from the Hengduan Mountains, China, with notes on Hannaea diversity in the region

Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the...

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Bibliographic Details
Published in:Diatom research 2021-01, Vol.36 (1), p.23-36
Main Authors: Luo, Fen, You, Qingmin, Zhang, Lixuan, Yu, Pan, Pang, Wanting, Bixby, Rebecca J., Wang, Quanxi
Format: Article
Language:English
Subjects:
biogeography
diatom
Diatoms
Fragilariaceae
Geographical distribution
Hannaea
Hengduan Mountains
Morphology
Mountains
New species
Scanning electron microscopy
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Summary:Three new species of Hannaea Patrick from the Hengduan Mountains in China are formally described herein, based on light and scanning electron microscope observations. Hannaea yalaensis sp. nov. has three continuous inflations along the ventral margin, resulting in an undulate outline compared to the outline of the most commonly reported Hannaea species. The valve of Hannaea hengduanensis sp. nov. is narrower, asymmetrical about the apical axis with capitate apices, dorsal and ventral sides almost parallel. On the ventral side of valve is an unornamented central area. The valve of Hannaea clavata sp. nov. is clavate. Valve margin is straight or slightly curved. The apices of the valve constrict sharply to form the capitate ends. In addition, we also briefly described other Hannaea from this region. Here, we document the morphologies of these new species and discuss the biogeographic distribution of the genus Hannaea in Asia.
ISSN:0269-249X
2159-8347
DOI:10.1080/0269249X.2021.1873193