Xenoturbella hollandorum

Description:

a, Dorsal view of the live unrelaxed holotype SIO-BIC BI1036, showing ring furrow (rf). b, Ventral view of the holotype (relaxed) showing mouth (m), ring furrow (rf) side furrow (sf) and epidermal ventral glandular network (vgn). c, Close-up of the anterior end of the holotype, showing mouth (m), ring furrow (rf), side furrow (sf) and the ventral glandular network (vgn) near the anterior tip of the animal. d, Close-up of the diamond-shaped mouth.