The posteromedian portion of the head lacking 1-3 simple eyes consisting of single beadlike lens. Used in Antkey to distinguish among formicine species. The character is not always reliable, however, and should be used with caution.
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Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith
