FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ovariole ID (Ontology) FBbt:00004893 (Fly Anatomy)
Definition An egg assembly line. Consists of a germarium at the anterior tip connected to a chain of egg chambers, each one more mature than the preceding, more anterior egg chamber in the chain. Each ovariole is encased in an ovarian sheath. A typical ovary contains about 16 ovarioles.[ FlyBase:FBrf0064777 ]
Comment DISAMBIGUATION: The term ovariole is sometimes incorrectly used to refer to individual egg chambers. Please use the term 'egg chamber' for this.
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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
 ovariole (all annotations which use CV term, excluding "NOT" statements)
     ovariole | absent
      --       --
     ovariole | adult stage
      --       --
     ovariole | decreased number
      --       --
      --
     ovariole | germline clone
      --       --
      --
     ovariole | germline clone | maternal effect
      --       --       --       --
     ovariole | heat sensitive
      --       --       --
     ovariole | increased number
      --       --
      --
     ovariole | maternal effect | cold sensitive
      --       --       --       --
     ovariole | non-rescuable maternal effect
      --       --
      --
     ovariole | pupal stage
      --       --
      --
     ovariole | somatic clone
      --       --       --       --
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adult
 |__ovary______________________________
gonad                                  |
 |__ovary______________________________|
female reproductive system             |
 |__ovary______________________________|
anatomical structure                   |
 |__multicellular structure____________|
female organism                        |
 |__female-specific anatomical entity__|
female-specific anatomical entity      |
 |__ovary______________________________|
anatomical entity                      |
 |__female-specific anatomical entity__|
                                       ovariole  6893 rec.
                                        |__basal stalk 72 rec.
                                        |__female germline cyst 5734 rec.
                                        |   |__cyst cell of ovary(+) 85 rec.
                                        |   |__egg chamber(+) 5551 rec.
                                        |   |__female germline 2-cell cyst(+)
                                        |   |__female germline 4-cell cyst(+)
                                        |   |__female germline 8-cell cyst(+) 6 rec.
                                        |   |__female germline 16-cell cyst(+) 28 rec.
                                        |   |__nurse cell ring canal(+) 202 rec.
                                        |__germarium 1818 rec.
                                        |   |__cystoblast 110 rec.
                                        |   |__escort cell(+) 105 rec.
                                        |   |__female fusome(+) 67 rec.
                                        |   |__female germline 2-cell cyst(+)
                                        |   |__female germline 4-cell cyst(+)
                                        |   |__female germline 8-cell cyst(+) 6 rec.
                                        |   |__female germline 16-cell cyst(+) 28 rec.
                                        |   |__follicle stem cell 133 rec.
                                        |   |__germarium region 1(+) 925 rec.
                                        |   |__germarium region 2(+) 128 rec.
                                        |   |__germarium region 3(+) 76 rec.
                                        |   |__prefollicle cell 13 rec.
                                        |   |__terminal filament(+) 124 rec.
                                        |   |__transition cell
                                        |__ovarian basement membrane 35 rec.
                                        |__somatic cell of ovariole 2936 rec.
                                        |   |__escort cell(+) 105 rec.
                                        |   |__follicle cell(+) 2679 rec.
                                        |   |__follicle stem cell 133 rec.
                                        |   |__germarium cap cell 176 rec.
                                        |   |__prefollicle cell 13 rec.
                                        |   |__terminal filament cell 33 rec.
                                        |   |__transition cell
                                        |__vitellarium 8 rec.
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Is a female-specific anatomical entity
multicellular structure
Part of ovary
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