FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

pale ommatidium

ID (Ontology)

FBbt:02000002 (Fly Anatomy)

Definition

Ommatidial subtype with stochastic distribution throughout the retina, making up about 30% of all non-dorsal margin ommatidia. This ommatidial subtype is specialized to detect shorter wavelengths (near UV + blue) than yellow ommatidia.[ FlyBase:FBrf0180690 ]

Comment

The pale ommatidium expresses the near ultraviolet-specific opsin Rh3 (FBgn0003249) in photoreceptor R7 cells and the blue-sensitive Rh5 (FBgn0014019) in photoreceptor R8 cells (Wernet and Desplan, 2004).

Links to External Ontologies

VFB:FBbt_02000002

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

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
pale ommatidium (all annotations which use CV term, excluding "NOT" statements)
pale ommatidium \| ectopic
pale ommatidium \| ectopic \| somatic clone
pale ommatidium \| heat sensitive
pale ommatidium \| somatic clone

Spanning Tree (Parents/Children)

retina________________
photoreceptor_________|
external sensillum____|
adult head sensillum__|
                      ommatidium
                       |__pale ommatidium  62 rec.
                           |__photoreceptor cell R7 of pale ommatidium 18 rec.
                           |__photoreceptor cell R8 of pale ommatidium 42 rec.

Spanning Tree View Settings
Parents/Children View Depth	Show hierarchy levels: for parents, for children
Relationships
Is a	ommatidium
Part of
Synonyms & Secondary IDs
Synonyms

Secondary IDs

External Crossreferences & Linkouts
	VFB:FBbt_02000002