FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

Nebenkern derivative

ID (Ontology)

FBbt:00004951 (Fly Anatomy)

Definition

Structure that develops from the Nebenkern during spermatid elongation. During late onion stage, the Nebenkern begins to unfurl and elongate. At comet stage it splits into two mitochondrial derivatives, which elongate and become unequal in size during mid elongation stage. The mitochondrial derivatives assume a characteristic position to a plane that splits the central pair of axoneme microtubules which changes slightly through elongation.[ FlyBase:FBrf0064778 ]

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)	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
Nebenkern derivative (all annotations which use CV term, excluding "NOT" statements)

Spanning Tree (Parents/Children)

elongation stage spermatid
 |__axial complex____________________
individualization stage spermatid    |
 |__axial complex____________________|
anatomical structure                 |
 |__cell component___________________|
male organism                        |
 |__male-specific anatomical entity__|
cell component                       |
 |__axial complex____________________|
male-specific anatomical entity      |
 |__axial complex____________________|
anatomical entity                    |
 |__male-specific anatomical entity__|
                                     Nebenkern derivative  37 rec.
                                      |__major mitochondrial derivative
                                      |__minor mitochondrial derivative

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	cell component male-specific anatomical entity
Develops from	Nebenkern
Part of	axial complex
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts