FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term tracheal metamere 1 ID (Ontology) FBbt:00005026 (Fly Anatomy)
Definition Metameric subdivision of the tracheal system that originates in the mesothoracic segment (T2). As well as tracheating the mesothoracic segment, the major trachea of this metamere extends into all segments anterior to T2.[ FlyBase:FBrf0034081 ]
Also Known As"Tr1"
CommentNote that terminal tracheation by each tracheal metamere extends beyond its segment of origin. According to Whitten (1980), the most anterior tracheal metamere corresponds to the prothoracic segment.
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
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 Alleles Genes Insertions
 tracheal metamere 1 (all annotations which use CV term, excluding "NOT" statements)
     tracheal metamere 1 | embryonic stage
      --
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tracheal metamere
 |__thoracic tracheal metamere__
ectodermal derivative           |
 |__dorsal ectoderm derivative__|
                                tracheal metamere 1  121 rec.
                                 |__adult spiracular tracheal branch 1
                                 |__anterior pupal spiracle 84 rec.
                                 |__cephalic tracheal branch primordium
                                 |__embryonic/larval cerebral tracheal anastomosis 6 rec.
                                 |__larval dorsal tracheal anastomosis 1
                                 |__larval tracheal branch of Tr1 32 rec.
                                 |   |__cephalic tracheal branch(+) 2 rec.
                                 |   |__cerebral tracheal branch 9 rec.
                                 |   |__cerebropharyngeal tracheal branch 2 rec.
                                 |   |__embryonic/larval dorsal tracheal branch 1 8 rec.
                                 |   |__embryonic/larval ganglionic tracheal branch 1 20 rec.
                                 |   |__embryonic/larval spiracular tracheal branch 1
                                 |   |__embryonic/larval tracheal transverse connective 1
                                 |   |__larval dorsal group tracheal branch 1
                                 |   |__larval fat body tracheal branch 1
                                 |   |__pharyngeal tracheal branch 2 rec.
                                 |__larval ventral tracheal anastomosis 1 1 rec.
                                 |__pupal dorsal tracheal branch 1
                                 |__pupal ganglionic tracheal branch 1
                                 |__pupal spiracular tracheal branch 1
                                 |__pupal ventral tracheal anastomosis 1
                                 |__pupal ventral tracheal branch 1
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Is a dorsal ectoderm derivative
thoracic tracheal metamere
Develops from mesothoracic tracheal primordium
Part of
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Synonyms
  • "Tr1" EXACT
    "tracheal hemisegment" RELATED
Secondary IDs
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