Four new Mallomonas species of the Torquatae series (Chrysophyceae)

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Abstract
Four new species of Mallomonas (Chrysophyceae), Mallomonas scrobiculata sp. nov., Mallomonas serrata sp. nov., Mallomonas labrinthina sp. nov., and Mallomonas favosa sp. nov., are described from transmission electron microscopy of silica-scale structure of specimens from lakes and ponds in Ontario, Canada. All four are of the Torquatae series (characterized by the uniquely shaped anterior collar scales with attached bristles and rhomboidal body scales lacking bristles) and are distinguished from others in the series (e.g., M. mangofera Harris & Bradley, M. alveolata Dürrschmidt, and M. pumilio H. & B. em. Asm. Cronb. & Dürrs.) by the distinctive (and constant) structure and ornamentation of their scales.

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