FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term ocellar retinula cell ID (Ontology) FBbt:00004242 (Fly Anatomy)
Definition Photoreceptor cell of an adult ocellus. It expresses the violet-sensitive Rh2 (Jean-Guillaume and Kumar, 2022). Its axons are found proximal to its nucleus, and they target their corresponding ocellar ganglion (Caldwell et al., 2007). The lateral ocelli each have around 100 photoreceptor cells, whereas the medial one has around 75 (Dorkenwald et al., 2024). Some of these cells directly target the lobula or lobula plate (Jean-Guillaume and Kumar, 2022). These cells aid flight stabilization and augment the phototactic response (Jean-Guillaume and Kumar, 2022). They form simpler circuits with fewer connections before reaching the central brain, resulting in faster transmission of information (Jean-Guillaume and Kumar, 2022).[ FlyBase:FBrf0050358 FlyBase:FBrf0200339 FlyBase:FBrf0255165 FlyBase:FBrf0260546 ]
Also Known As"ocellar photoreceptor cell" ; "ocellus photoreceptor" ; "ocellus retinula cell"
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VFB:FBbt_00004242
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 ocellar retinula cell (all annotations which use CV term, excluding "NOT" statements)
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light-sensitive neuron
 |__rhabdomeric photoreceptor cell__
sensory neuron                      |
 |__adult sensory neuron____________|
adult neuron                        |
 |__adult sensory neuron____________|
somatic cell                        |
 |__sensory organ cell______________|
                                    ocellar retinula cell  112 rec.
                                     |__lateral ocellar retinula cell
                                     |__medial ocellar retinula cell
                                     |__ocellus pigment granule 64 rec.
                                     |__ocellus rhabdomere 19 rec.
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Is a sensory organ cell
rhabdomeric photoreceptor cell
adult sensory neuron
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Synonyms
  • "ocellar photoreceptor cell" EXACT[ FlyBase:FBrf0255165 ]
    "ocellus photoreceptor" EXACT
    "ocellus retinula cell" EXACT
Secondary IDs
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VFB:FBbt_00004242