A translucent cylinder forming part of the light-sensitive receptor in the eye of an arthropod.
- Postlarvae settling at the vents have reasonably normal ommatidia, with layered rhabdoms, standard crystalline cones, and faceted external corneas reflective of the zoeal apposition eye.
- The receptors have long fused rhabdoms and are surrounded by a tracheal tapetum.
- Thus, in some parts of the retina the larval rhabdoms are incorporated into the receptor array.
Late 19th century: from late Greek rhabdōma, from rhabdos 'rod'.
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