Fig. 8 in Echinoderes blazeji Grzelak & Sørensen 2022, sp. nov.

Fig. 8. Morphological characteristics of eye development of Sepia pharaonis. (A) Annular optic sac (arrow) is translucent (st. 19). (B) The iris diaphragm (arrow) in the center of the optic sac starts to develop (st. 20). (C) The bean-shaped lens (arrowhead) and the iris (arrow) form (st. 21). (D) A thinly pigmented annular ring (arrow) is present (st. 22). (E) Corneal tissues (arrow) proceed to cover eyes where pigmentation of the retina continues (st. 23). (F) Retina is intensely pigmented, and the cornea (arrow) develops to cover the eyes (st. 24). Inset is the close-up of the cornea layer of the embryo fixed in Bouin's solution. (G) The eyes are enclosed by cornea and become opaque and dark-red (st. 25). Inset is the close-up of the cornea layer of the embryo fixed in Bouin's solution. (H) Lens protrude out toward the orbit, and the eyes appear totally dark (st. 26). Inset is the close-up of the cornea structure of the embryo fixed in Bouin's solution. It is a preliminary form of the W-shaped eye structure. st: stage. Scale bar = 250 nm.