FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term second segment of antenna ID (Ontology) FBbt:00004514 (Fly Anatomy)
Definition Second segment of the antenna located ventrolaterally to the first segment. It is larger than the first segment and somewhat swollen. It has on average 25 bristles of various sizes. The Johnston's organ is contained in this segment.[ FlyBase:FBrf0007734 FlyBase:FBrf0031004 ]
Also Known As"antennal segment 2" ; "pedicel"
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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
 second segment of antenna (all annotations which use CV term, excluding "NOT" statements)
     second segment of antenna | cell autonomous | ectopic | somatic clone
      --       --       --       --
     second segment of antenna | heat sensitive
      --       --       --
     second segment of antenna | increased number
      --       --       --       --
     second segment of antenna | pharate adult stage
      --       --       --       --
     second segment of antenna | posterior
      --       --
      --
     second segment of antenna | somatic clone
      --       --       --       --
     second segment of antenna | somatic clone - tissue specific
      --       --       --       --
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antenna____________
appendage segment__|
                   segment of antenna
                    |__second segment of antenna  182 rec.
                        |__antennal segment 2 sense organ 118 rec.
                        |   |__antennal segment 2 microchaeta(+) 2 rec.
                        |   |__Johnston organ 115 rec.
                        |__second antennal segment muscle 4 rec.
                            |__second antennal segment muscle 14(+) 2 rec.
                            |__second antennal segment muscle 15(+) 3 rec.
                            |__second antennal segment muscle cell(+) 4 rec.
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Is a segment of antenna
Develops from presumptive second segment of antenna
Part of
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Synonyms
Secondary IDs
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https://www.ento.csiro.au/biology/drosophila/melanogaster.html?pedicel