FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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.
Links to External Ontologies
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     319
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       2
Insertions (FBti)  PHENOTYPE_MANIFEST_IN      80
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      77
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
 ovariole (all annotations which use CV term, excluding "NOT" statements)     319     24      1     82     78
     ovariole | absent       5       --       --       2      4
     ovariole | adult stage       6       --       --       1      5
     ovariole | decreased number       1       --       --       1       --
     ovariole | germline clone      62       --       --      13       --
     ovariole | germline clone | maternal effect       2       --       --       --       --
     ovariole | heat sensitive       3       --       --       --       1
     ovariole | increased number       2       --       --       2       --
     ovariole | maternal effect | cold sensitive       1       --       --       --       --
     ovariole | non-rescuable maternal effect       1       --       --       1       --
     ovariole | pupal stage       1       --       --       1       --
     ovariole | somatic clone       5       --       --       --       --
Spanning Tree (Parents/Children)
Only view relationship:
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  6803 rec.
                                        |__basal stalk 68 rec.
                                        |__female germline cyst 5683 rec.
                                        |   |__cyst cell of ovary(+) 84 rec.
                                        |   |__egg chamber(+) 5501 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(+) 201 rec.
                                        |__germarium 1760 rec.
                                        |   |__cystoblast 110 rec.
                                        |   |__escort cell(+) 105 rec.
                                        |   |__female fusome(+) 60 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(+) 878 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 2919 rec.
                                        |   |__escort cell(+) 105 rec.
                                        |   |__follicle cell(+) 2662 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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