Glyptonotus antarcticus
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Glyptonotus antarcticus is a benthic marine isopod crustacean in the suborder Valvifera. This relatively large isopod is found in the Southern Ocean around Antarctica. It was first described by James
Glyptonotus antarcticus
Ommatidium
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The compound eyes of arthropods like insects, crustaceans and millipedes are composed of units called ommatidia. An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and
Glyptonotus antarcticus
…in) in rare cases; this is large for an isopod, most of which are between 0.5 and 1.5 cm (0.2–0.6 in) in length. Glyptonotus antarcticus has only five ommatidia, which is unusual for crustaceans and insects. These are clustered into two pairs of compound eyes, a large pair on the dorsal surface and a smaller…
Ommatidium: A – cornea, B – crystalline cone, C & D – pigment cells, E – rhabdom, F – photoreceptor cells, G – membrana fenestrata, H – optic nerve
Ommatidia of a krill
Astronotus ocellatus closeup