Xenoturbella profunda

描述：

b, Ventral view of the holotype SIO-BIC BI1041, a male (relaxed) showing mouth (m), ring furrow (rf), side furrow (sf) and epidermal ventral glandular network (vgn). c, Dorsal view of the holotype showing the ring furrow (rf). The ventral glandular network (vgn) is visible where part of the ventral side is exposed. d, Close-up of the ventral anterior end of female paratype SIO-BIC BI1044, showing mouth (m), ring furrow (rf), side furrow (sf) and beginning of ventral glandular network (vgn) near the anterior tip of the animal. e, Close-up of the dorsal posterior of female paratype SIO-BIC BI1044, showing oocytes of different sizes distributed in the parenchyma