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Rappemonads are haptophyte phytoplankton.

Masanobu Kawachi1, Takuro Nakayama2, Motoki Kayama3

  • 1National Institute for Environmental Studies, Ibaraki 305-8506, Japan.

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|March 27, 2021
PubMed
Summary
This summary is machine-generated.

Marine phytoplankton diversity is vast, with a newly identified group, rappemonads, now classified as Rappephyceae. This discovery clarifies their evolutionary history within Haptophyta and highlights their significant role as primary producers.

Keywords:
environmental DNA sequencesmorphological evolutionorganellar phylogenomicsphytoplankton diversitytransmission electron microscopy

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Area of Science:

  • Marine biology
  • Phycology
  • Evolutionary biology

Background:

  • Environmental DNA sequencing reveals extensive marine phytoplankton diversity.
  • The phenotypic identity of many sequenced organisms, including rappemonads, remains unknown.
  • Rappemonads, identified by environmental DNA, do not fit known algal clades.

Purpose of the Study:

  • To identify the phenotypic identity of the rappemonad lineage.
  • To determine the evolutionary placement of rappemonads within marine phytoplankton.
  • To assess the ecological significance of this newly identified group.

Main Methods:

  • Organellar phylogenomic analyses were used.
  • Environmental plastid 16S rRNA sequences were analyzed.
  • Comparative analysis with known haptophyte species was performed.

Main Results:

  • Rappemonads are closely related to Pavlomulina ranunculiformis, forming a new haptophyte class, Rappephyceae.
  • Phylogenomic data place Rappephyceae as a sister group to Prymnesiophyceae within Haptophyta.
  • Rappephyceae are cosmopolitan and abundant, comparable to major haptophyte species, indicating significant primary production.

Conclusions:

  • The phenotypic identity and evolutionary history of Haptophyta have been clarified.
  • Rappephyceae represent a significant, previously unrecognized component of marine primary production.
  • This finding underscores the importance of integrating environmental DNA data with traditional taxonomic approaches.