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Style

In a few species of fiddler crab, males may have a style growing out of the eye on the same side as the major claw. Usually the style is fairly short and not all males will have one. In the species Uca stylifera, all males have a long style, about the same length as the eyestalk. The style serves no known purpose, although it may be under sexual selection.

A male Uca stylifera, with a long style (indicated by the arrow) coming out of the left eye (always on the same side as the major claw). Photo by Michael S. Rosenberg. image
A male Uca stylifera, with a long style (indicated by the arrow) coming out of the left eye (always on the same side as the major claw). Photo by Michael S. Rosenberg.