FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term ommatidium ID (Ontology) FBbt:00004510 (Fly Anatomy)
Definition One of the facets of the compound eye. It is composed of eight light-sensing photoreceptor cells (photoreceptor cell R1-R8) and accessory cells. There are around 800 ommatidia in each compound eye.[ FlyBase:FBrf0166419 FlyBase:FBrf0180690 ]
Comment
Links to External Ontologies
VFB:FBbt_00004510
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    2350
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       4
Insertions (FBti)  PHENOTYPE_MANIFEST_IN     287
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN    1044
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
 ommatidium (all annotations which use CV term, excluding "NOT" statements)    2350     11      3    291   1044
     ommatidium | adult stage     125       --       --       5    103
     ommatidium | adult stage | conditional       9       --       --       1      4
     ommatidium | adult stage | decreased number       3       --       --       --       1
     ommatidium | adult stage | increased number       2       --       --       --       --
     ommatidium | adult stage | light conditional       8       --       --       --       7
     ommatidium | adult stage | progressive       4       --       --       --       3
     ommatidium | adult stage | progressive | conditional       3       --       --       1      2
     ommatidium | adult stage | somatic clone      16       --       --       3      7
     ommatidium | adult stage | somatic clone - tissue specific       5       --       --       1      4
     ommatidium | adult stage | somatic clone | conditional       1       --       --       --       --
     ommatidium | cell autonomous       1       --       --       1       --
     ommatidium | cell autonomous | somatic clone      15       --       --       3       --
     ommatidium | cell non-autonomous       1       --       --       --       --
     ommatidium | cell non-autonomous | somatic clone      21       --       --       1      7
     ommatidium | cold sensitive       5       --       --       --       3
     ommatidium | conditional      13       --       --       --      14
     ommatidium | decreased number       9       --       --       1      9
     ommatidium | drug conditional       3       --       --       --       5
     ommatidium | ectopic      12       --       --       --      14
     ommatidium | ectopic | heat sensitive       1       --       --       --       --
     ommatidium | ectopic | somatic clone       2       --       --       --       1
     ommatidium | female       3       --       --       3       --
     ommatidium | female | germline clone       1       --       --       --       --
     ommatidium | heat sensitive      41       --       --       2     26
     ommatidium | increased number       7       --       --       1      8
     ommatidium | increased number | heat sensitive       1       --       --       --       --
     ommatidium | larval stage       3       --       --       --       2
     ommatidium | larval stage | somatic clone       2       --       --       1       --
     ommatidium | light conditional       4       --       --       1      3
     ommatidium | male       1       --       --       --       --
     ommatidium | maternal effect       7       --       --       1      2
     ommatidium | maternal effect | somatic clone       1       --       --       --       --
     ommatidium | P-stage      28       --       --       1     14
     ommatidium | P-stage | ectopic       2       --       --       --       4
     ommatidium | P-stage | ectopic | somatic clone       1       --       --       --       --
     ommatidium | P-stage | parental effect       2       --       --       1       --
     ommatidium | P-stage | somatic clone       3       --       --       --       3
     ommatidium | paternal effect       1       --       --       --       --
     ommatidium | pharate adult stage       2       --       --       1       --
     ommatidium | pharate adult stage | increased number       2       --       --       --       --
     ommatidium | pharate adult stage | somatic clone       1       --       --       --       --
     ommatidium | posterior       1       --       --       --       1
     ommatidium | progressive      24       --       --       1     25
     ommatidium | progressive | conditional       1       --       --       --       --
     ommatidium | pupal stage      14       --       --       1     12
     ommatidium | pupal stage P6       2       --       --       2       --
     ommatidium | pupal stage P7       5       --       --       2      2
     ommatidium | pupal stage | somatic clone       5       --       --       --       1
     ommatidium | RU486 conditional       2       --       --       --       2
     ommatidium | somatic clone     247       --       --      43     41
     ommatidium | somatic clone - Minute background       6       --       --       --       --
     ommatidium | somatic clone - tissue specific       2       --       --       --       --
     ommatidium | somatic clone | drug conditional       5       --       --       --       --
     ommatidium | somatic clone | heat sensitive       1       --       --       --       --
     ommatidium | somatic clone | increased number       5       --       --       --       --
     ommatidium | somatic clone | nutrition conditional       1       --       --       --       --
     ommatidium | somatic clone | third instar larval stage       2       --       --       --       --
     ommatidium | temperature conditional       7       --       --       --       9
     ommatidium | third instar larval stage      10       --       --       --       9
Spanning Tree (Parents/Children)
Only view relationship:
adult head
 |__adult head sensillum_________
head sensillum                   |
 |__adult head sensillum_________|
eye                              |
 |__retina_______________________|
sense organ                      |
 |__photoreceptor________________|
external sensory organ           |
 |__external sensillum___________|
adult peripheral nervous system  |
 |__retina_______________________|
portion of tissue                |
 |__retina_______________________|
sensillum                        |
 |__external sensillum___________|
adult sensillum                  |
 |__adult head sensillum_________|
visual system                    |
 |__photoreceptor________________|
                                 ommatidium  5748 rec.
                                  |__cone cell 494 rec.
                                  |   |__anterior cone cell(+) 2 rec.
                                  |   |__cone cell pigment granule(+)
                                  |   |__equatorial cone cell(+) 4 rec.
                                  |   |__polar cone cell(+) 4 rec.
                                  |   |__posterior cone cell(+) 2 rec.
                                  |__dorsal margin ommatidium 52 rec.
                                  |   |__dorsal margin photoreceptor cell(+) 52 rec.
                                  |__eye photoreceptor cell 2910 rec.
                                  |   |__dorsal margin photoreceptor cell(+) 52 rec.
                                  |   |__eye photoreceptor cell stalk(+) 80 rec.
                                  |   |__inner photoreceptor cell(+) 1247 rec.
                                  |   |__outer photoreceptor cell(+) 607 rec.
                                  |   |__rhabdomere of eye photoreceptor cell(+) 399 rec.
                                  |__lens 164 rec.
                                  |   |__cornea 28 rec.
                                  |   |__pseudocone 13 rec.
                                  |__pale ommatidium 62 rec.
                                  |   |__photoreceptor cell R7 of pale ommatidium 18 rec.
                                  |   |__photoreceptor cell R8 of pale ommatidium 42 rec.
                                  |__primary pigment cell 155 rec.
                                  |   |__primary pigment cell pigment granule 7 rec.
                                  |__yellow ommatidium 61 rec.
                                      |__photoreceptor cell R7 of yellow ommatidium 23 rec.
                                      |__photoreceptor cell R8 of yellow ommatidium 34 rec.
Spanning Tree View Settings
Parents/Children
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Is a photoreceptor
external sensillum
adult head sensillum
Develops from ommatidial precursor cluster
Part of retina
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Synonyms
Secondary IDs
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UBERON:0000971
VFB:FBbt_00004510