Figure 2. Hagfish segmentation. A in Glide-leflection symmetly in deutelostomes: an evolutionaly pelspective

Figure 2. Hagfish segmentation. A* segmental structures of the roof of the abdominal cavity of Myxine glutionosa ZIN 39898 in ventral view. B–E* Eptatretus stoutii ZIN 56859: (B)* (D1)* and (E) belong to the same individual. B* segmental structures of the walls of abdominal cavity dissected along the right side and spread on a plane; C* external orifices of gill sacs and mucous pouches of the left side (skin removed); D1– D3* individual variations of segmentation represented by subcutaneous blood vessels (some marked with arrowheads) on the underside of the skin of the dorsal surface of the cranial part of the body; E* mucous pouches on the ventral side of the tail. GS* gill sac [its orifice in (C)]; MM* myomere; MP* mucous pouch [its orifice in (C)]; NT* notochord; OD* opisthonephric duct (ureter).