FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term larval labial organ ID (Ontology) FBbt:00002720 (Fly Anatomy)
Definition Compound external sense organ of the late embryo or larva that is located in the lower lip of the external opening of the atrium (Campos-Ortega and Hartenstein, 1997; Richter et al., 2024). It consists of 3 sensilla, one with 3 neurons and the others with one each (Campos-Ortega and Hartenstein, 1997). Neurons of the labial organ and ventral pharyngeal sense organ form a large cluster flanking the salivary duct (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0034076 FlyBase:FBrf0089570 ]
Also Known As "embryonic/larval labial organ" ; "lbo" ; "lower lip sense organ"
Comment Richter et al. (2024) only find the two mono-innervated sensilla on the external larva.
Links to External Ontologies
VFB:FBbt_00002720
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       5
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       1
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       1
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
 larval labial organ (all annotations which use CV term, excluding "NOT" statements)       5      3      2      1      1
     larval labial organ | heat sensitive       1       --       --       --       1
Spanning Tree (Parents/Children)
Only view relationship:
larval sense organ
 |__embryonic/larval head sense organ__
external sensory organ                 |
 |__external compound sense organ______|
compound sense organ                   |
 |__external compound sense organ______|
                                       larval labial organ  12 rec.
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Is a external compound sense organ
embryonic/larval head sense organ
Part of larval labial sensory complex
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Synonyms
  • "embryonic/larval labial organ" EXACT
    "lbo" EXACT[ FlyBase:FBrf0089570 ]
    "lower lip sense organ" EXACT
Secondary IDs
hide External Crossreferences & Linkouts
VFB:FBbt_00002720