FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ocellus ID (Ontology) FBbt:00004505 (Fly Anatomy)
Definition A simple visual organ on the top of the adult head (Jean-Guillaume and Kumar, 2022). There are three of these per head, arranged in a triangle with one on the midline and the others slightly posterior and lateral (Jean-Guillaume and Kumar, 2022). They develop from the eye discs (Jean-Guillaume and Kumar, 2022).[ FlyBase:FBrf0166419 FlyBase:FBrf0255165 ]
Comment
Links to External Ontologies
VFB:FBbt_00004505
Annotations
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Direct annotations: records annotated with this exact term (child terms are NOT included)
Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 ocellus (all annotations which use CV term, excluding "NOT" statements)
     ocellus | absent
      --       --
      --
     ocellus | absent | pharate adult stage
      --       --
      --
     ocellus | anterior
      --       --       --       --
     ocellus | ectopic
      --       --
     ocellus | ectopic | somatic clone
      --       --       --       --
     ocellus | heat sensitive
      --       --       --       --
     ocellus | pharate adult stage
      --       --
      --
     ocellus | somatic clone
      --       --       --       --
     ocellus | somatic clone - Minute background
      --       --       --       --
     ocellus | somatic clone | increased number
      --       --       --       --
Spanning Tree (Parents/Children)
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adult head
 |__adult head sensillum__
head sensillum            |
 |__adult head sensillum__|
sense organ               |
 |__photoreceptor_________|
external sensory organ    |
 |__external sensillum____|
sensillum                 |
 |__external sensillum____|
adult sensillum           |
 |__adult head sensillum__|
region of integument      |
 |__ocellar triangle______|
visual system             |
 |__photoreceptor_________|
vertex                    |
 |__ocellar triangle______|
                          ocellus  469 rec.
                           |__lateral ocellus 14 rec.
                           |__medial ocellus 17 rec.
                           |__ocellus lens 10 rec.
                               |__ocellus cornea 2 rec.
                               |__ocellus corneagenous cell 2 rec.
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Is a photoreceptor
external sensillum
adult head sensillum
Develops from presumptive ocellus
Part of ocellar triangle
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Synonyms
Secondary IDs
hide External Crossreferences & Linkouts
https://www.ento.csiro.au/biology/drosophila/melanogaster.html?ocellus
UBERON:0003161
VFB:FBbt_00004505