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Deep-sea holothurian specimens were collected during five scientific expeditions (2018–2023) using the submersible vehicle ‘Shenhaiyongshi’. Our examination of specimens of   Deimatidae   from the South China Sea and the Mariana fore-arc area revealed three new species, which were described as    Oneirophanta   idsseica    sp. nov. ,    Oneirophanta   brunneannulata    sp. nov. , and    Oneirophanta   lucerna    sp. nov.  These species were distinguished from each other and from congeners by the arrangement, and number of ventrolateral tube feet and ossicle types. We also reported    Oneirophanta   mutabilis   mutabilis    Théel, 1879 for the first time from the Mariana fore-arc area, and we recorded    Deima   validum   validum    for the second time from the South China Sea. The taxonomy of these new species and new records is discussed, and a phylogenetic analysis based on a concatenated dataset of 16S and  COI  genes was conducted. Additionally, the inter- and intraspecific genetic divergences we calculated among deimatid species. The results support the assignment of these new species to the genus    Oneirophanta    and their separation from congeners. A description of the main morphological characters of    Oneirophanta    species is also provided. The data were collected from geographically diverse areas and suggest that species of   Deimatidae   were abundant in the Pacific Ocean and occupied a wide range of depths.

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﻿Three new species and one new record of   Deimatidae   (  Echinodermata  ,   Holothuroidea  ,   Synallactida  ) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods

﻿Three new species and one new record of Deimatidae ( Echinodermata , Holothuroidea , Synallactida ) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods

Three new species and one new record of Deimatidae ( Echinodermata , Holothuroidea , Synallactida ) discovered in the South China Sea and the Mariana fore-arc area using integrative taxonomic methods