FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term tracheal primordium ID (Ontology) FBbt:00005037 (Fly Anatomy)
Definition Primordium of a single tracheal metamere of the embryonic/larval tracheal system from its appearance as a placode during stage 11 to the completion of fusion with adjacent tracheal metameres in stage 15/16. There are 10 pairs of tracheal primordia - one pair in each segment from T2 to A8. Each tracheal primordium originates as a slight depression in the lateral ectoderm during stage 10 known as a tracheal placode. During stage 11, these placodes invaginate to form tracheal pits that elongate and branch. These pits close over during stage 13. Fusion of tracheal primordia begins at stage 14 with fusion of the dorsal trunk primordia and is complete by early stage 16.[ FlyBase:FBrf0089570 ]
Also Known As "P2 TrachP"
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Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      28
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       6
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       8
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 tracheal primordium (all annotations which use CV term, excluding "NOT" statements)      30    191      2      6     14
     tracheal primordium | ectopic       7       --       --       --       5
     tracheal primordium | ectopic | germline clone | maternal effect       1       --       --       --       --
     tracheal primordium | embryonic stage       4       --       --       --       --
     tracheal primordium | germline clone | maternal effect       1       --       --       --       --
Spanning Tree (Parents/Children)
Only view relationship: 
embryo
 |__developing embryonic structure________________
developing material anatomical entity             |
 |__developing embryonic structure________________|
 |__primordium____________________________________|
presumptive embryonic/larval system               |
 |__presumptive embryonic/larval tracheal system__|
ectodermal derivative                             |
 |__dorsal ectoderm derivative____________________|
                                                  tracheal primordium  623 rec.
                                                   |__abdominal tracheal primordium 8 rec.
                                                   |   |__abdominal tracheal pit(+) 7 rec.
                                                   |   |__abdominal tracheal primordium 1(+) 5 rec.
                                                   |   |__abdominal tracheal primordium 2(+) 4 rec.
                                                   |   |__abdominal tracheal primordium 3(+) 2 rec.
                                                   |   |__abdominal tracheal primordium 4(+) 2 rec.
                                                   |   |__abdominal tracheal primordium 5(+) 2 rec.
                                                   |   |__abdominal tracheal primordium 6(+) 3 rec.
                                                   |   |__abdominal tracheal primordium 7(+) 5 rec.
                                                   |   |__abdominal tracheal primordium 8(+) 5 rec.
                                                   |__cephalic tracheal branch primordium
                                                   |__mesothoracic tracheal primordium 24 rec.
                                                   |   |__mesothoracic tracheal pit 23 rec.
                                                   |   |__tracheal dorsal trunk posterior branch 1 primordium
                                                   |   |__tracheal lateral trunk posterior branch 1 primordium
                                                   |__metathoracic tracheal primordium 25 rec.
                                                   |   |__metathoracic tracheal pit 24 rec.
                                                   |   |__tracheal dorsal trunk anterior branch 2 primordium
                                                   |   |__tracheal dorsal trunk posterior branch 2 primordium
                                                   |   |__tracheal lateral trunk anterior branch 2 primordium
                                                   |   |__tracheal lateral trunk posterior branch 2 primordium
                                                   |__tracheal pit 429 rec.
                                                       |__abdominal tracheal pit(+) 7 rec.
                                                       |__cephalic tracheal branch primordium
                                                       |__dorsal tracheal branch primordium 79 rec.
                                                       |__ganglionic tracheal branch primordium 83 rec.
                                                       |__mesothoracic tracheal pit 23 rec.
                                                       |__metathoracic tracheal pit 24 rec.
                                                       |__spiracular tracheal branch primordium 2 rec.
                                                       |__tracheal dorsal trunk primordium(+) 184 rec.
                                                       |__tracheal lateral trunk primordium(+) 54 rec.
                                                       |__tracheal transverse connective primordium 21 rec.
                                                       |__visceral tracheal branch primordium 35 rec.
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Is a developing embryonic structure
primordium
dorsal ectoderm derivative
Part of presumptive embryonic/larval tracheal system
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Synonyms
  • "P2 TrachP" EXACT
    "tracheal placode" RELATED
    "TrachP3" RELATED
Secondary IDs
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UBERON:6005037