Extended Data Fig. 2: Specimen of D. tucolus YKLP 11393 preserved in a dwelling tube.

a, Specimen YKLP 11393b, for which the anterior region, dwelling tube and a partial abdomen are preserved. b, Specimen YKLP 11393a, for which the anterior region, dwelling tubes and a partial abdomen are preserved. c, Specimen YKLP 11393b. Magnification of the anterior region (boxed area shown in a). The white arrowheads indicate the tube margins. d, Interpretative drawing of the region shown in c. e, Magnification of the prostomium and palps shown in c. f, Specimen YKLP 11393a. Magnification of the anterior region (boxed area shown in b). The white arrowheads indicate the tube margins. g, Magnification of the same region as in f, imaged using fluorescence microscopy. h, Interpretative drawing of the region shown in f and g. i, Poorly preserved abdominal region, from the region shown in a, imaged using direct light. j, Same region as in i, imaged using fluorescence microscopy. k, Poorly preserved abdominal region, from the region shown in b, imaged using direct light. l, Same region as in k, imaged using fluorescence microscopy. m, Thoracic chaetiger showing parapodia and chaetae from the region shown in b. n, Thoracic chaetiger showing parapodia and chaetae from the region shown in a.