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stemma, stemmata

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (S)
No Taxon stemma, stemmata
Explanation of Names
From Greek stemma, garland (1).
Identification
stemma noun, plural stemmata - the simple eye of a certain larval insects, also called lateral ocelli, though they are not homologous with ocelli. They are found on the heads of the larvae of most holometabolus insects. Structurally, they resemble individual elements of the compound eye (ommatidia) more than ocelli, and indeed, are found on the area of the head where compound eyes develop in the adult insect. The visual information gathered from the stemmata is used, usually, to detect motion, but (1).

Photos showing stemmata:
Print References
Gordh, entry for stemma (1)
Internet References
Works Cited
1.A Dictionary of Entomology
George Gordh, David H. Headrick. 2003. CABI Publishing.