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<p>Radiolarians (Infrakingdom: Rhizaria; Phylum: Retaria) are an integral component of marine biogeochemical cycles and are well known for their contribution to the formation of deep-sea siliceous deposits, commonly referred to as radiolarian ooze. With a fossil record dating back to the Cambrian period (~ 530&#xa0;million years ago), they are widely used as proxies in paleoceanographic and paleoclimatic studies. However, giant radiolarians remain rarely encountered, largely due to their fragile nature and the limited understanding of their ecology and distribution. In the present study, the rare radiolarian species <i>Tricranastrum trinibrachium</i> Takahashi, 1991 (syn. <i>Myelastrum trinibrachium</i>) is reported for the first time from the Bay of Bengal (BoB) along the southeast coast of India, representing only the second record from the Indian Ocean. Several individuals were observed in plankton samples collected during 2021, with sizes ranging from 825 to 1455&#xa0;μm. Previously, this species was primarily reported from the Pacific Ocean, with a recent isolated record from the Arabian Sea. The present finding extends the known biogeographical range of <i>T. trinibrachium</i> and highlights the underexplored diversity of radiolarians in the Indian Ocean region.</p>

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First Report of Radiolarian Tricranastrum trinibrachium Takahashi 1991 from the Bay of Bengal, India

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Gouri Sahu,
  • A. K. Mohanty,
  • R. S. Sathishkumar,
  • N. P. I. Das,
  • S. Panigrahi,
  • K. D. Arunachalam,
  • O. Annalakshmi,
  • C. V. Srinivas

摘要

Radiolarians (Infrakingdom: Rhizaria; Phylum: Retaria) are an integral component of marine biogeochemical cycles and are well known for their contribution to the formation of deep-sea siliceous deposits, commonly referred to as radiolarian ooze. With a fossil record dating back to the Cambrian period (~ 530 million years ago), they are widely used as proxies in paleoceanographic and paleoclimatic studies. However, giant radiolarians remain rarely encountered, largely due to their fragile nature and the limited understanding of their ecology and distribution. In the present study, the rare radiolarian species Tricranastrum trinibrachium Takahashi, 1991 (syn. Myelastrum trinibrachium) is reported for the first time from the Bay of Bengal (BoB) along the southeast coast of India, representing only the second record from the Indian Ocean. Several individuals were observed in plankton samples collected during 2021, with sizes ranging from 825 to 1455 μm. Previously, this species was primarily reported from the Pacific Ocean, with a recent isolated record from the Arabian Sea. The present finding extends the known biogeographical range of T. trinibrachium and highlights the underexplored diversity of radiolarians in the Indian Ocean region.