FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term sacculus ID (Ontology) FBbt:00004179 (Fly Anatomy)
Definition A three-chambered pit organ on antennal segment 3 that contains many sensilla. It extends ventrodorsally, with an opening to the posterior side of the antennal segment (Shanbhag et al., 1995).[ FlyBase:FBrf0084361 ]
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VFB:FBbt_00004179
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 Alleles Genes Images Insertions Constructs
 sacculus (all annotations which use CV term, excluding "NOT" statements)
     sacculus | ectopic
      --       --       --
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third segment of antenna
 |__antennal segment 3 sense organ__
external sensory organ              |
 |__external compound sense organ___|
adult antennal sense organ          |
 |__antennal segment 3 sense organ__|
compound sense organ                |
 |__external compound sense organ___|
                                    sacculus  35 rec.
                                     |__chamber I of sacculus 4 rec.
                                     |   |__sensillum of sacculus chamber I 3 rec.
                                     |__chamber II of sacculus 8 rec.
                                     |   |__sensillum of sacculus chamber II 2 rec.
                                     |__chamber III of sacculus 1 rec.
                                     |   |__dorsal compartment of chamber III of sacculus(+)
                                     |   |__sensillum of sacculus chamber III(+) 1 rec.
                                     |   |__ventral compartment of chamber III of sacculus(+)
                                     |__sensillum of sacculus 6 rec.
                                         |__sensillum of sacculus chamber I 3 rec.
                                         |__sensillum of sacculus chamber II 2 rec.
                                         |__sensillum of sacculus chamber III(+) 1 rec.
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Is a antennal segment 3 sense organ
external compound sense organ
Develops from presumptive sacculus
Part of
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VFB:FBbt_00004179