FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term embryonic/larval posterior spiracle ID (Ontology) FBbt:00000424 (Fly Anatomy)
Definition The main spiracle of the larva on the dorsal side of the eight (last) abdominal segment. During the first larval instar it is the only functional spiracle of the larva. A bilateral pair of these spiracles is housed in a bilateral pair of integumentary specializations - the stigmatophores. Each consists of a plate containing the spiracular openings. These connect to a spiracular chamber which in turn connects to the posterior end of the dorsal trunk. In the second instar there are three ovoid openings on the stigmatic plate and four alternating tufts of slightly branched hairs. In the third instar, the spiracles are somewhat larger and the hairs more markedly branched.[ FlyBase:FBrf0034081 FlyBase:FBrf0064787 ]
Also Known As "larval posterior spiracle"
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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 Images Insertions Constructs
 embryonic/larval posterior spiracle (all annotations which use CV term, excluding "NOT" statements)
     embryonic/larval posterior spiracle | ectopic
      --       --       --
     embryonic/larval posterior spiracle | embryonic stage
      --       --       --       --
     embryonic/larval posterior spiracle | embryonic stage | maternal effect
      --       --       --       --
     embryonic/larval posterior spiracle | first instar larval stage
      --       --       --       --
     embryonic/larval posterior spiracle | germline clone
      --       --
      --
     embryonic/larval posterior spiracle | heat sensitive
      --       --       --
     embryonic/larval posterior spiracle | larval stage
      --       --
     embryonic/larval posterior spiracle | late embryonic stage
      --       --       --       --
     embryonic/larval posterior spiracle | maternal effect
      --       --       --       --
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abdominal segment 8
 |__stigmatophore______________
larval tracheal system         |
 |__embryonic/larval spiracle__|
spiracle                       |
 |__embryonic/larval spiracle__|
integumentary specialization   |
 |__stigmatophore______________|
                               embryonic/larval posterior spiracle  793 rec.
                                |__spiracular chamber 330 rec.
                                |   |__filzkorper 317 rec.
                                |__spiracular filament
                                |__spiracular plate 22 rec.
                                    |__posterior spiracular gland(+)
                                    |__posterior spiracular scar
                                    |__spiracular hair(+) 20 rec.
                                    |__spiracular opening 2 rec.
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Is a embryonic/larval spiracle
Develops from posterior spiracle primordium
Part of stigmatophore
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Synonyms
  • "larval posterior spiracle" EXACT
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