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<p>During the expedition to an unnamed seamount of Caroline Ridge in the northwest Pacific Ocean, one <i>Thalassometra</i> specimen was sampled, and careful morphological assessment suggested that this specimen represents a new species within the genus <i>Thalassometra</i>: <i>Thalassometra brachia</i> sp. nov. This new species was collected at a depth of 688 m and is characterized by the dome-like centrodorsal, large number of arms (43 in total), irregularly arranged sockets with three per radial area, P2 and P3, similar in size and character and smaller than P1, spinous median carination on the first and second ossicles of the division series and on the first two brachials, and dense spicules in brachial bases.</p>

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A new species of genus Thalassometra AH Clark, 1907 (Crinoidea: Tropiometroidea: Thalassometridae) from a seamount on the Caroline Ridge in the northwest Pacific

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Shao’e Sun,
  • Zijie Mei,
  • Zhongli Sha

摘要

During the expedition to an unnamed seamount of Caroline Ridge in the northwest Pacific Ocean, one Thalassometra specimen was sampled, and careful morphological assessment suggested that this specimen represents a new species within the genus Thalassometra: Thalassometra brachia sp. nov. This new species was collected at a depth of 688 m and is characterized by the dome-like centrodorsal, large number of arms (43 in total), irregularly arranged sockets with three per radial area, P2 and P3, similar in size and character and smaller than P1, spinous median carination on the first and second ossicles of the division series and on the first two brachials, and dense spicules in brachial bases.