FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ocellar triangle ID (Ontology) FBbt:00004495 (Fly Anatomy)
Definition Region of the integument of the medial part of the vertex of the adult head, where the ocelli are located (Ferris, 1950). It has a smooth surface, in contrast to the surrounding cuticle (Ferris, 1950).[ FlyBase:FBrf0007734 ]
Also Known As"interocellar cuticle" ; "IOC" ; "vertical triangle"
CommentThe ocellar triangle does not correspond to a separate sclerite (Ferris, 1950).
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
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 Alleles Genes Images Insertions
 ocellar triangle (all annotations which use CV term, excluding "NOT" statements)
     ocellar triangle | pharate adult stage
      --       --
     ocellar triangle | somatic clone
      --       --       --
     ocellar triangle | somatic clone - Minute background
      --       --       --
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adult head capsule
 |__vertex________________
integumentary system      |
 |__region of integument__|
region of integument      |
 |__vertex________________|
organ system subdivision  |
 |__region of integument__|
                          ocellar triangle  597 rec.
                           |__interocellar bristle 38 rec.
                           |__ocellar bristle 165 rec.
                           |__ocellus 469 rec.
                               |__lateral ocellus 14 rec.
                               |__medial ocellus 17 rec.
                               |__ocellus lens(+) 10 rec.
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Is a region of integument
Part of vertex
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https://www.ento.csiro.au/biology/drosophila/melanogaster.html?ocellar%20triangle