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Sampling sites for examined species of Deimatidae in the South China Sea and the Mariana fore-arc area.


Oneirophanta idsseica sp. nov. (Holotype: IDSSE-2018-0612-HS01) A in situ image B holotype in live C dorsal view D ventrolateral view. Scale bars: 5 cm.


SEM images of different tissues from Oneirophanta idsseica sp. nov. (Holotype: IDSSE-2018-0612-HS01) A1–A10 dorsal body wall B1–B10 papillae C tentacles D1–D4 tube feet E1–E5 ventral body wall. Scale bars: 50 μm (A1, A2, A7, B3, B4, D3, D4, E4); 100 μm (A3–A6, A8, A10, B2, B5, B6, E3, E5); 300 μm (A9, B1, B7–B10, C, D1, D2, E1, E2).


Oneirophanta brunneannulata sp. nov. (Holotype: IDSSE-2018-0612-HS01) A dorsal view B ventral view. Scale bar: 6 cm.


SEM images of Oneirophanta brunneannulata sp. nov. (Holotype: IDSSE-2018-0612-HS01) A1–A3 dorsal body wall B1–B6 papillae C tentacles D1–D4 tube feet E1–E2 ventral body wall. Scale bars: 300 μm.


Oneirophanta lucerna sp. nov. (Holotype IDSSE-2023-0208-HS02) A, B in situ images C dorsal view D ventral view. Scale bars: 5 cm.


SEM images of Oneirophanta lucerna sp. nov. (Holotype IDSSE-2023-0208-HS02) A1–A4 dorsal body wall B1–B4 papillae C1–C4 ventral body wall D1–D5 tube feet E1–E5 tentacles Scale bars: 50 μm (A1–A2, B1–B2, C2); 100 μm (C3, D1–E5); 200 μm (A3, A4; B3–C1).


Oneirophanta mutabilis mutabilis Théel, 1879 (IDSSE-2020-1203-HS01) A dorsal view B ventral view. Scale bar: 3 cm.


SEM images of Oneirophanta mutabilis mutabilis Théel, 1879 (IDSSE-20201203-HS01). A1, A2 dorsal body wall B1, B2 dorsal papillae C1–C3 ventral body wall D1–D5 tube feet E1–E5 tentacle. Scale bars: 300 μm (A1–C3); 100 μm (D1–E1, E3–E5); 50 μm (E2).


Deima validum validum (IDSSE-2018-0531-HS02 and IDSSE-2019-0630-HS01) A in situ image (IDSSE-2018-0531-HS02) B in vivo image (IDSSE-2018-0531-HS02) C dorsal view (IDSSE-2019-0630-HS01) D ventral view (IDSSE-2019-0630-HS01). Scale bars: 5 cm.


SEM images of Deima validum validum (IDSSE-2019-0630-HS01). A1–A3 dorsal body wall B1–B3 papillae C1–C4 tube feet D1–D2 ventral body wall. Scale bars: 300 μm (A1–B3); 50 μm (D1, D2)


Maximum likelihood (ML) and Bayesian inference (BI) trees based on concatenated 16S-COI sequences showing phylogenetic relationships among deimatid species. The new sequences provided in this study are in bold A ML tree, with bootstrap replications labeled B BI tree, with posterior probability labeled.