FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term dorsal margin ommatidium ID (Ontology) FBbt:02000000 (Fly Anatomy)
Definition An ommatidial subtype located in a single row at the dorsal margin of the eye. This ommatidial subtype is specialized to detect the angle of polarized light.[ FlyBase:FBrf0051852 FlyBase:FBrf0180690 ]
Also Known As"dorsal rim ommatidium"
CommentThe dorsal margin ommatidium expresses the opsin Rh3 (FBgn0003249) that detects polarized light in both photoreceptor R7 and R8 cells (Fortini and Rubin, 1990).
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VFB:FBbt_02000000
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 dorsal margin ommatidium (all annotations which use CV term, excluding "NOT" statements)
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retina
 |__ommatidium________
 |__dorsal rim area___|
photoreceptor         |
 |__ommatidium________|
portion of tissue     |
 |__dorsal rim area___|
external sensillum    |
 |__ommatidium________|
adult head sensillum  |
 |__ommatidium________|
                      dorsal margin ommatidium  52 rec.
                       |__dorsal margin photoreceptor cell 52 rec.
                           |__dorsal margin photoreceptor cell R7 13 rec.
                           |__dorsal margin photoreceptor cell R8 16 rec.
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Is a ommatidium
Part of dorsal rim area
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VFB:FBbt_02000000