Table 1.

Stages of E. scolopes during embryogenesis and corresponding developmental events occurring in eye and light organ (Montgomery and McFall-Ngai, 1993; Arnold et al., 1972; Lee et al., 2009).

Stage	Event in Eye	Event in light organ
17	Eye primordia appear as two bilaterally positioned oval ectodermal thickenings
19	Eye ectodermal placodes internalize as the annular folds thicken around periphery, forming the optic vesicle	Paired lateral mesoderm of hindgut-ink sac complex begins to proliferate
21	Retinas are pigmented; paired optic lobe primordia are evident
22	Lens primordia are visible	Anterior epithelial appendage and first pair of crypts begins to form
23	Folds of iris have formed
24	Pigmentation of retina continues to increase	Anterior and posterior appendages are evident and partially ciliated; epithelial cells of crypts form extensive brush borders; cells toward site of future ducts form cilia; reflector cells begin to differentiate
26		Second pair of crypts begins formation; epithelial cells forming crypts appear fully differentiated; many reflector cells differentiated; ink cells are functional
27	Eyes can move freely in orbits
28	Primary lid covers the eye; patches of iridophores present on the eye	Third pair of crypts begins formation
30		Three crypts are present on each side; entire lateral surface of each side of light organ is ciliated