Table S1. Detailed comparison between features of Ramisyllis multicaudata gen. et sp. nov. and Syllis ramosa. The literature references are abbreviated as follows: I66, Imajima (1966); M79, McIntosh (1879); M85, McIntosh (1885); O95, Oka (1895).

Table S2. Raw morphological and meristic data for the type material, arranged by body width. The primary axis could not be determined on well-branched specimens (specimens 1, 9, and 10). ‘Total chaetigers’ includes tiny developing ones; the measurement of appendages was performed on one from the pair in best condition.

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