FB2026_03 , released September 17, 2026
FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term dorsal appendage ID (Ontology) FBbt:00000046 (Fly Anatomy)
Definition Paired appendage of the eggshell, located on the anterior-dorsal side of the egg, just posterior to the operculum. Functions as a respiratory structure. The dorsal appendages are formed during the final stages of oogenesis, when dorsal appendage forming follicle cells form paired tubular structures and secrete chorion proteins into the tube lumens to create the dorsal appendages. During eggshell maturation the dorsal appendage forming cells slough off, revealing the chorionic dorsal appendages inside.[ FlyBase:FBrf0064777 FlyBase:FBrf0174518 ]
Also Known As "chorionic appendage"
Comment Note that dorsal appendage structure varies considerably between Drosophilid species.
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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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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions Constructs
 dorsal appendage (all annotations which use CV term, excluding "NOT" statements)
     dorsal appendage | absent
      --       --       --       --
     dorsal appendage | cell non-autonomous | ectopic | somatic clone
      --       --       --
     dorsal appendage | cold sensitive
      --       --       --       --
     dorsal appendage | decreased number | germline clone
      --       --       --       --
     dorsal appendage | dorsal | somatic clone
      --       --       --       --
     dorsal appendage | drug conditional
      --       --
     dorsal appendage | ectopic
      --       --
     dorsal appendage | ectopic | cold sensitive
      --       --       --
     dorsal appendage | ectopic | heat sensitive
      --       --       --
     dorsal appendage | ectopic | somatic clone
      --       --       --
     dorsal appendage | egg stage
      --       --       --       --
     dorsal appendage | embryonic stage 12
      --       --
      --
     dorsal appendage | embryonic stage | maternal effect
      --       --       --       --
     dorsal appendage | germline clone
      --       --
     dorsal appendage | germline clone | increased number
      --       --       --       --
     dorsal appendage | germline clone | maternal effect
      --       --
      --
     dorsal appendage | germline clone | non-rescuable maternal effect
      --       --       --       --
     dorsal appendage | heat sensitive
      --       --       --
     dorsal appendage | increased number
      --       --       --
     dorsal appendage | maternal effect
      --       --
     dorsal appendage | maternal effect | heat sensitive
      --       --       --
     dorsal appendage | maternal effect | somatic clone
      --       --
      --
     dorsal appendage | non-rescuable maternal effect
      --       --       --
     dorsal appendage | oogenesis
      --       --       --       --
     dorsal appendage | oogenesis stage S14
      --       --       --
     dorsal appendage | somatic clone
      --       --
     dorsal appendage | somatic clone | ventral
      --       --       --       --
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chorion_________________________
acellular anatomical structure__|
                                chorionic specialization
                                 |__dorsal appendage  1079 rec.
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Is a chorionic specialization
Develops from dorsal appendage forming follicle cell
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UBERON:6000046