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Mediocremonas mediterraneus, a New Member within the Developea.

Bradley A Weiler1, Elisabet L Sà2, Michael E Sieracki3

  • 1Department of Marine Biology and Ecology, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida, 33149, USA.

The Journal of Eukaryotic Microbiology
|September 3, 2020
PubMed
Summary
This summary is machine-generated.

A new aquatic stramenopile, Mediocremonas mediterraneus, was discovered. This heterotrophic predator offers insights into marine phagotrophy and the evolution of stramenopiles.

Keywords:
BacterivoryTSARculturingheterotrophic nanoflagellatesmicroscopyphagotrophyphylogenystramenopilestaxonomy

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Area of Science:

  • Microbiology
  • Eukaryotic diversity
  • Marine biology

Background:

  • Stramenopiles are a diverse eukaryotic group with varied lifestyles.
  • They form the supergroup TSAR along with alveolates, rhizarians, and telonemids.
  • Understanding stramenopile diversity is crucial for marine ecosystem studies.

Purpose of the Study:

  • To introduce a new genus and species of aquatic stramenopile.
  • To characterize Mediocremonas mediterraneus as a heterotrophic predator.
  • To explore its phylogenetic placement and potential for genomic research.

Main Methods:

  • Isolation and culturing of a novel nanoflagellated stramenopile.
  • Morphological characterization of cell size and flagella.
  • Phylogenetic analysis based on genetic similarity to known species.
  • Measurement of growth and grazing rates in batch cultures.

Main Results:

  • A new genus and species, Mediocremonas mediterraneus, was identified.
  • Cells are small (2.0-4.0 μm), oval-shaped, and possess two flagella.
  • Growth rate ranged from 0.68 to 1.83 d⁻¹, and grazing rate was 1.99 to 5.38 bacteria/h.
  • Phylogenetic analysis showed high similarity to members of the class Developea.

Conclusions:

  • Mediocremonas mediterraneus is a free-swimming heterotrophic predator.
  • Its phylogenetic position and culturability make it valuable for studying phagotrophy.
  • It can aid in understanding the heterotrophy-to-phototrophy transition in stramenopiles.