Table 1.

The specimens included in this study, their retinal specialization type, location of specialization on the retina and typical habitat types.

species	pupil shape	type of specialization	position of specialization	typical habitat
S. plangon	‘w’	horizontal band	horizontal equator	seagrass, mudflats, rocky reef, benthic
O. cyanea	horizontal band	horizontal band	horizontal equator	coral reef, rocky reef
S. lessoniana	‘u’	centralized area	centre	seagrass, rocky reef midwater