Ecology, Morphology, Phylogeny and Taxonomic Revision of Giant Radiolarians, Orodaria ord. nov. (Radiolaria; Rhizaria; SAR)

Yasuhide Nakamura, Akihiro Tuji, Katsunori Kimoto, Atsushi Yamaguchi, Rie S. Hori, Noritoshi Suzuki

Research output: Contribution to journalArticlepeer-review

Abstract

The phylogenetic affiliation of Oroscenidae, a family of Radiolaria possessing large siliceous skeletons, was thoroughly revised in this study. Plankton sampling was conducted over seven years in seven sea areas of the Northern Hemisphere. Molecular analyses on the obtained specimens revealed that living oroscenids are phylogenetically different from hitherto-known radiolarian orders. The detailed examinations by Microfocus X-ray Computed Tomography and Scanning Electron Microscopy clarified that oroscenids and the related family (Thalassothamnidae) have unique skeletal characteristics different from other radiolarian orders. Judging from their phylogenetic distinctiveness and the difference in the morphology and ecology, Oroscenidae and Thalassothamnidae should be classified in a single order distinct from other radiolarian orders, and consequently, a new order, Orodaria, is established.

Original languageEnglish
Article number125808
JournalProtist
Volume172
Issue number3
DOIs
Publication statusPublished - 2021 Jul

Keywords

  • MXCT
  • shell-bearing protist
  • silica
  • single-cell PCR
  • unicellular zooplankton

ASJC Scopus subject areas

  • Microbiology

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