Glossary beginning with O

Illustrated glossary of morphological and biological terms
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O

ocelli absent

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.

ocelli present

The posteromedian portion of the head with 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.

ocellus

[Antwiki.org] (pl. ocelli)
A maximum of three simple, single-faceted eyes, which when present (absent in many worker ant taxa) are located in a triangle on the cephalic dorsum. Morphologically the anterior ocellus marks the posterior limit of the frons, and the posterior pair are on the vertex.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith