FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term surstylus ID (Ontology) FBbt:00004843 (Fly Anatomy)
Definition Paired hook-shaped sclerotized lobe that extends ventrally from the subepandrial sclerite and surrounds the phallus. It contains 25 thorn-like bristles (surstylar teeth) in a curved band and one long surstylar bristle at the end.[ FlyBase:FBrf0029539 FlyBase:FBrf0244105 ]
Also Known As "clasper" ; "coxopodite" ; "forceps" (for all, see Synonyms field below)
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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      32
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       3
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       5
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN       7
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 Images Insertions Constructs
 surstylus (all annotations which use CV term, excluding "NOT" statements)      35      2      8     10
     surstylus | cell autonomous | somatic clone       1       --       --       --
     surstylus | ectopic | female limited       2       --       --       1
     surstylus | heat sensitive       1       --       --       1
     surstylus | somatic clone       6       --       1      1
Spanning Tree (Parents/Children)
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sclerite
 |__abdominal tergite____________
dorsal ectoderm derivative       |
 |__abdominal tergite____________|
region of integument             |
 |__periphallic sclerite_________|
male-specific anatomical entity  |
 |__periphallic sclerite_________|
                                 surstylus  63 rec.
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Is a abdominal tergite
periphallic sclerite
Develops from presumptive surstylus
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Synonyms
Secondary IDs
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https://www.ento.csiro.au/biology/drosophila/melanogaster.html?surstylus