FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN     338
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION      22
Insertions (FBti)  PHENOTYPE_MANIFEST_IN      19
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      25
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 ocellus (all annotations which use CV term, excluding "NOT" statements)     340     22      6     40     45
     ocellus | absent       1       --       --       1       --
     ocellus | absent | pharate adult stage       2       --       --       1       --
     ocellus | anterior       1       --       --       --       --
     ocellus | ectopic      11       --       --       1      2
     ocellus | ectopic | somatic clone       2       --       --       --       --
     ocellus | heat sensitive       3       --       --       --       --
     ocellus | pharate adult stage       3       --       --       1       --
     ocellus | somatic clone       7       --       --       --       --
     ocellus | somatic clone - Minute background       1       --       --       --       --
     ocellus | somatic clone | increased number       1       --       --       --       --
Spanning Tree (Parents/Children)
Only view relationship:
head sensillum
 |__adult head sensillum__
sense organ               |
 |__photoreceptor_________|
external sensory organ    |
 |__external sensillum____|
sensillum                 |
 |__external sensillum____|
adult sensillum           |
 |__adult head sensillum__|
                          ocellus  469 rec.
                           |__lateral ocellus 14 rec.
                           |__medial ocellus 17 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