The Compound Eyes of Fiddler Crabs: A Tutorial (page 3)

Elongated Eyes

Fiddler crab compound eyes are not round, but vertically elongated (not quite as extreme as the eye of a ghost crab shown here).

The angle between the directions of view of neighbouring ommatidia depends on the local radius of the eye:

Large eye radius = small interommatidial angles = better resolution.

Image gallery

Updated:  20 November 2019/Responsible Officer:  Director RSB/Page Contact:  Webmaster RSB