FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term labrum ID (Ontology) FBbt:00004522 (Fly Anatomy)
Definition A small, sclerotized, apically pointed flap, distal to the clypeus. It lies in a groove along the median region of the haustellum. The oral opening is behind and at the base of this flap.[ FlyBase:FBrf0007734 ]
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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      20
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       4
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 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Images Insertions
 labrum (all annotations which use CV term, excluding "NOT" statements)      20      7     11      5
     labrum | absent | embryonic stage       1       --       --       --
     labrum | embryonic stage       3       --       --       --
     labrum | larval stage       4       --       --       1
Spanning Tree (Parents/Children)
Only view relationship:
ectodermal derivative
 |__anterior ectoderm derivative__
 |__ventral ectoderm derivative___|
anatomical entity                 |
 |__integumentary specialization__|
                                  labrum  44 rec.
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Is a integumentary specialization
anterior ectoderm derivative
ventral ectoderm derivative
Develops from clypeo-labral disc
Part of adult maxillary segment
haustellum
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Synonyms
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UBERON:0005905