Abstract
Using electron microscopy we describe an accessory lateral eye for Cylindroiulus, a diplopod. The accessory eye is situated at the cell body rind of the optic lobes, deep inside the head, and is composed of six R-cells; a dioptric apparatus is absent. Comparison reveals that many arthropods possess accessory lateral eyes in addition to the compound eyes or lateral ocelli. Their homology and distribution among the arthropod main lineages is discussed along with characters that may be useful for reconstructing phylogeny.
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