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. 2021 Jan;68(1):e12825.
doi: 10.1111/jeu.12825. Epub 2020 Dec 27.

Mediocremonas mediterraneus, a New Member within the Developea

Bradley A Weiler  1 , Elisabet L Sà  2 , Michael E Sieracki  3 , Ramon Massana  2 , Javier Del Campo  1
Affiliations

Mediocremonas mediterraneus, a New Member within the Developea

Bradley A Weiler et al. J Eukaryot Microbiol. 2021 Jan.

Abstract

The stramenopiles are a large and diverse group of eukaryotes that possess various lifestyles required to thrive in a broad array of environments. The stramenopiles branch with the alveolates, rhizarians, and telonemids, forming the supergroup TSAR. Here, we present a new genus and species of aquatic nanoflagellated stramenopile: Mediocremonas mediterraneus, a free-swimming heterotrophic predator. M. mediterraneus cell bodies measure between 2.0-4.0 μm in length and 1.2-3.7 μm in width, possessing two flagella and an oval body morphology. The growth and grazing rate of M. mediterraneus in batch cultures ranges from 0.68 to 1.83 d-1 and 1.99 to 5.38 bacteria/h, respectively. M. mediterraneus was found to be 93.9% phylogenetically similar with Developayella elegans and 94.7% with Develorapax marinus, two members within the class Developea. The phylogenetic position of the Developea and the ability of M. mediterraneus to remain in culture make it a good candidate for further genomic studies that could help us to better understand phagotrophy in marine systems as well as the transition from heterotrophy to phototrophy within the stramenopiles.

Keywords: Bacterivory; TSAR; culturing; heterotrophic nanoflagellates; microscopy; phagotrophy; phylogeny; stramenopiles; taxonomy.

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References

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