FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term tracheolar cell ID (Ontology) FBbt:00005048 (Fly Anatomy)
Definition Specialized cell of the tracheal system that forms the secondary and terminal branches (tracheoles) of the tracheal tree. Each forms a secondary branch of a primary trachea. This secondary branch itself branches into multiple tracheoles within fine cytoplasmic projections that invade (tracheate) target tissues. Tracheolar cells are the main site of respiratory gaseous exchange within the tracheal system.[ FlyBase:FBrf0064787 FlyBase:FBrf0088947 ]
Also Known As"tracheal end cell" ; "tracheoblast"
CommentPresent at all developmental stages.
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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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Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 tracheolar cell (all annotations which use CV term, excluding "NOT" statements)
     tracheolar cell | wandering third instar larval stage
      --       --
     tracheolar cell | wandering third instar larval stage | heat sensitive
      --       --       --
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epithelial cell__
tracheal system__|
                 tracheocyte
                  |__tracheolar cell  104 rec.
                      |__mestracheon 1 rec.
                      |__secondary tracheal branch 43 rec.
                      |   |__embryonic/larval dorsal group tracheal branch(+)
                      |   |__embryonic/larval lateral group tracheal branch(+) 30 rec.
                      |__tracheole 45 rec.
                          |__coiled tracheole 6 rec.
                          |__embryonic tracheole 11 rec.
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Is a tracheocyte
Develops from terminal tracheal cell
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