Figure I. Additional Vetulicolians.

a,b, Didazoon haoae, a, ELI-0000197, two superimposed specimen s, upper with intestine in posterior section showing spiral arrangement of contents, lower with excavated anterior section showing gills and possible endostyle; b, ELI-0000199, with incompletely preserved anterior section and recurved posterior.

c,d, Xidazoon stephanus, c, Specimen ELI-0000206, anterior section with mouth region. d, Specimen ELI-0000205A, ventral view of anterior section showing mouth cone and possible endostyle.

e,f, Vetulicola cuneata, e, ELI-0000214, entire specimen with prominent gills. f, ELI-0000485, entire specimen with prominent gill-tubes.

g,h, Vetulicola rectangulata, g, ELI-0000306B, complete specimen; h, ELI-0000318, complete specimen.  Scale bars millimetric

Figure II. Gill structures of Vetulicola cuneata (c,g;d,h;i,m;k,o;q,u;t,x) and V. rectangulata (a,e;b,f;j,n;l,p;r,v;s,w).

a,e, specimen ELI-0000317A; b,f, specimen ELI-0000306B; c,g, specimen ELI-0000207; d,h, specimen ELI-0000215; i,m, specimen ELI-0000207; j,n, specimen ELI-0000337B;

k,o, specimen ELI-0000274; l,p, specimen ELI-0000338A; q,u, specimen ELI-0000214;

r,v, specimen ELI-0000306A; s,w, specimen ELI-0000270; t,x, specimen ELI-0000256.

Scale bars millimetric

Figure III. Coiled gut of Vetulicola cuneata.

a,b, specimen ELI-0000309A; c,d, specimen ELI-0000255.

Scale bars millimetric

Figure IV. Surface membranes (see arrows) of Vetulicola cuneata (a,g,h,k-n,p-r) and

V. rectangulata (b-f,i,j,o).

a,b, anterior of specimens ELI-0000346 and ELI-0000264;

c-i, posterior and ventral margins of the anterior section of specimens, ELI-0000317A, 317A, 322, 380, 255,320, 260 respectively;

j, membrane along the lateral mid-line tube and gills of specimen ELI-0000338A;

k-o, dorsal °∞fin°± and dorso-posterior margins of specimens ELI-0000320, 319,338A, 261,210 respectively;

p-r, membranes along margins of posterior section of specimens ELI-0000302A, 313, 312B respectively.

Scale bars millimetric