How does the nocturnal sweat bee see?
The nocturnal sweat bee (Megalopta genalis) is a insect in the order Hymenoptera. Its eyes belong to the vision type Colour or navigation at night.
Measured in this species: sharpness. Measured colour or sharpness: a measured receptor set or acuity in this species; other dials come from relatives or group defaults. Every value below carries its evidence level and sources; nothing is typed by hand.
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What stands out
- It has two colour receptor classes (a dichromat): reds and greens fall on one axis, as in red-green colour blindness in people.
- Its sharpest vision resolves 0.3 cycles per degree: the finest stripe pattern it can tell apart from grey.
- It stops seeing flicker at 141.8 Hz, against 60 Hz for people in this dataset, so fast motion looks about 2.4 times slower to it.[8][6]
- Activity pattern: diurnal.
The six dials
Evidence levels: how the tiers work. "Measured" means a value measured in this species; "Estimated" values come from a close relative or an eye-size formula.
| Dial | Value | Evidence | Sources |
|---|---|---|---|
| Colour | Colour receptors 2 receptor classes: 442 nm (SWS (blue)), 528 nm (MWS (green)) receptor set of nearest measured relative Lasioglossum malachurum (same family Halictidae) | Estimated | [1] |
| Sharpness | Acuity 0.3 cycles per degree median of 2 optical rows (method priority rule) | Measured | [2] |
| Angle between facets 1.4° minimum (acute-zone) interommatidial angle over sources; within caves2018: minimum (round-1 rule: mean of horizontal and vertical when both exist) | Measured | [2] | |
| Eye type compound eye | |||
| Field of view | No value in the catalogue. | ||
| Sharp zones (foveas) | Number of foveas 0 median of 91 relatives in class Insecta: Empis prodromus, Rhamphomyia albidiventris, Rhamphomyia breviventris, Rhamphomyia maculipennis, Rhamphomyia marginata, Rhamphomyia murina | Group default | [3] |
| Fovea type none | Group default | [3] | |
| Night vision | Activity pattern diurnal mode of 2 relatives in family Halictidae: Lasioglossum albipes, Lasioglossum malachurum | Estimated | [4] |
| Rods vs cones no rods (invertebrate photoreceptors) | Estimated | [4] | |
| Motion (flicker fusion) | Flicker fusion frequency 141.8 Hz median of 8 relatives in order Hymenoptera: Apis mellifera, Myrmecia croslandi, Myrmecia gulosa, Myrmecia midas, Myrmecia pyriformis, Myrmecia tarsata | Group default | [5][6][7] |
Other senses
- polarisation vision: optional overlay of degree/angle of linear polarisation (Group default)
Related animals
- Tokay gecko same vision type
- Elephant hawk-moth same vision type
- Hummingbird hawk-moth same vision type
- Helmet gecko same vision type
- Inagua least gecko same vision type
- Indo-Pacific gecko same vision type
More insects: all insects with measured vision data.
Sources
- van der Kooi CJ, Stavenga DG, Arikawa K, Belusic G, Kelber A. 2021. Evolution of insect color vision: from spectral sensitivity to visual ecology. Annu Rev Entomol 66:435-461. Supplementary table. doi.org/10.1146/annurev-ento-061720-071644
- Caves EM, Brandley NC, Johnsen S (2018) Visual acuity and the evolution of signals. Trends Ecol Evol 33:358-372. Supplementary Tables S1-S3.. doi.org/10.1016/j.tree.2018.03.001
- Comparative data for dance fly eye morphology and female ornamentation (Empididae). Data: Dryad doi:10.5061/dryad.rr4xgxd5z. doi.org/10.5061/dryad.rr4xgxd5z
- Longcore T. 2023. A compendium of photopigment peak sensitivities and visual spectral response curves of terrestrial wildlife to guide design of outdoor nighttime lighting. Basic Appl Ecol 73:40-50. doi:10.1016/j.baae.2023.09.002. doi.org/10.5281/zenodo.8432720
- Haarlem CS, Hynes C, Jackson AL, Mitchell KJ, O'Connell RG, Healy K. 2026. Pace of ecology drives the tempo of visual perception across the animal kingdom. Nature Ecology & Evolution (doi:10.1038/s41559-026-02994-7). Figshare dataset 10.6084/m9.figshare.30556475. doi.org/10.6084/m9.figshare.30556475
- Inger R, Bennie J, Davies TW, Gaston KJ. 2014. Potential biological and ecological effects of flickering artificial light. PLoS ONE 9(5): e98631. Table 3. doi.org/10.1371/journal.pone.0098631
- Lafitte A, Sordello R, Legrand M, Nicolas V, Obein G, Reyjol Y. 2022. A flashing light may not be that flashy: A systematic review on critical fusion frequencies. PLoS ONE 17(12): e0279718. S10 File (CFF database). doi.org/10.1371/journal.pone.0279718
- Healy K, McNally L, Ruxton GD, Cooper N, Jackson AL. 2013. Metabolic rate and body size are linked with perception of temporal information. Animal Behaviour 86:685-696. Table 1. doi.org/10.1016/j.anbehav.2013.06.018
Every value cites its sources (all sources). Data: catalogue-v1, built 2026-09-29. Accuracy notes: how accurate is this?