FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

ptilinum

ID (Ontology)

FBbt:00004483 (Fly Anatomy)

Definition

Membranous sac that is part of the front of the head capsule. It is everted at eclosion and serves to break open the operculum at the end of the puparium. Following eclosion, it is withdrawn into the head where it collapses and becomes sclerotized, externally leaving the ptilinal suture.[ FlyBase:FBrf0007310 FlyBase:FBrf0007734 FlyBase:FBrf0031004 ]

Comment

Links to External Ontologies

Annotations

Records annotated with this term OR any of its CHILD TERMS

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Direct annotations: records annotated with this exact term (child terms are NOT included)

Data Class	Field	Direct annotations
Alleles (FBal)	PHENOTYPE_MANIFEST_IN
Insertions (FBti)	EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)	PHENOTYPE_MANIFEST_IN

Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Alleles	Genes	Images	Insertions	Constructs
ptilinum (all annotations which use CV term, excluding "NOT" statements)
ptilinum \| clone of cells		--	--	--	--

Spanning Tree (Parents/Children)

adult external head
 |__adult head capsule_______
integumentary system         |
 |__region of integument_____|
region of integument         |
 |__adult head capsule_______|
organ system subdivision     |
 |__region of integument_____|
ventral ectoderm derivative  |
 |__adult head capsule_______|
                             ptilinum  32 rec.
                              |__ptilinal suture 5 rec.
                              |__shingle cuticle of lateral ptilinum

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	region of integument
Develops from	presumptive ptilinum
Part of	adult head capsule
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts