FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term Wheeler's organ ID (Ontology) FBbt:00004807 (Fly Anatomy)
Definition A chordotonal organ associated with the anterior of abdominal sternite 2. It is visible externally as a raised patch of smooth cuticle without trichomes or bristles. It consists of two clusters of scolopidia (FBbt:00005217), one on either side of the ventral midline (Smith and Shepherd, 1996). The sensory neurons of Wheeler's organ project through the second segmental nerve of the abdomen and then through the abdominal neuromeres via dorso-lateral tract of the ventral fasciculus (DLV), to terminate in the prothoracic neuromere (Smith and Shepherd, 1996).[ FlyBase:FBrf0032262 FlyBase:FBrf0042053 FlyBase:FBrf0085956 ]
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VFB:FBbt_00004807
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
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 Wheeler's organ (all annotations which use CV term, excluding "NOT" statements)
     Wheeler's organ | ectopic
      --       --
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adult abdominal segment 2
 |__abdominal sternite 2_____
adult sense organ            |
 |__adult chordotonal organ__|
abdominal sternite           |
 |__abdominal sternite 2_____|
chordotonal organ            |
 |__adult chordotonal organ__|
                             Wheeler's organ  6 rec.
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Is a adult chordotonal organ
Part of abdominal sternite 2
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VFB:FBbt_00004807