FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

tracheal metamere 4

ID (Ontology)

FBbt:00005029 (Fly Anatomy)

Definition

Segmental unit of the tracheal system that is mainly found in abdominal segment 2.

Also Known As

"Tr4"

Comment

Note that terminal tracheation by each tracheal metamere extends beyond its segment of origin.

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
Insertions (FBti)	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	Insertions
tracheal metamere 4 (all annotations which use CV term, excluding "NOT" statements)
tracheal metamere 4 \| embryonic stage

Spanning Tree (Parents/Children)

tracheal metamere
 |__abdominal tracheal metamere__
ectodermal derivative            |
 |__dorsal ectoderm derivative___|
                                 tracheal metamere 4  16 rec.
                                  |__adult abdominal spiracular tracheal branch 4
                                  |__adult dorsal superficial tracheal branch 4
                                  |__adult ventral superficial tracheal branch 4
                                  |__embryonic/larval dorsal tracheal branch 4 6 rec.
                                  |__embryonic/larval ganglionic tracheal branch 4 7 rec.
                                  |__embryonic/larval spiracular tracheal branch 4
                                  |__embryonic/larval tracheal transverse connective 4 1 rec.
                                  |__larval dorsal group tracheal branch 4
                                  |__larval dorsal tracheal anastomosis 4
                                  |__larval fat body tracheal branch 4
                                  |__larval lateral E tracheal branch 4
                                  |__larval lateral F tracheal branch 4
                                  |__larval lateral G tracheal branch 4
                                  |__larval lateral H tracheal branch 4
                                  |__non-functional pupal spiracle 4
                                  |__pupal dorsal tracheal branch 4
                                  |__pupal spiracular tracheal branch 4
                                  |__pupal tracheal transverse connective 3
                                  |__visceral tracheal branch 4

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	dorsal ectoderm derivative abdominal tracheal metamere
Develops from	abdominal tracheal primordium 2
Part of
Synonyms & Secondary IDs
Synonyms
	"Tr4" EXACT "tracheal hemisegment" RELATED
Secondary IDs

External Crossreferences & Linkouts