d: Eye diameter (μm) | a: Om-matidia size (μm) | Ommatidia shape | Approximation of eye geometry used | n: Longest row of ommatidia | Opening angle of ommatidia (degree) | se: Surface of eye (μm²) | so: surface of one ommatidium (μm²) | Number of ommatidia | |||
---|---|---|---|---|---|---|---|---|---|---|---|
Formula applied → | Measured | Flat | \( \frac{d}{a} \) | nul, by definition | \( \pi \times {\left(\frac{d}{2}\right)}^2 \) | Quadrate: | a² | \( \frac{se}{so} \) | |||
Age | Species ↓ | Specimen ↓ | Hemispheric | \( \frac{\pi \times d}{2\times a} \) | \( \frac{180}{n} \) | \( 2\pi \times {\left(\frac{d}{2}\right)}^2 \) | Hexagonal: | \( \begin{array}{l}3\sqrt{3}\hfill \\ {}2\hfill \end{array}\times {\left(\begin{array}{l}a\hfill \\ {}2\hfill \end{array}\right)}^2 \) | |||
Late Jurassic | Rosenfeldia oppeli | SMNS 66004 | 3,400 | 53 | Hexagonal | Flat | 64 | 0.00 | 9,079,203 | 1,824 | 4,976 |
Hemispheric | 101 | 1.79 | 18,158,406 | 9,953 | |||||||
Palaeopentacheles roettenbacheri | SMNS 67903 | 1,100 | 35 | Quadratic | Flat | 31 | 0.00 | 950,332 | 1,225 | 776 | |
Hemispheric | 49 | 3.65 | 1,900,664 | 1,552 | |||||||
Palaeopolycheles longipes | SMNS 63724 | 4,200 | 50 | Quadratic | Flat | 84 | 0 | 13,854,424 | 2,500 | 5,542 | |
Hemispheric | 132 | 1.36 | 27,708,847 | 11,084 | |||||||
Knebelia totoroi | SMNS 67916 | 7,200 | 67.5 | Quadratic | Flat | 107 | 0 | 40,715,041 | 4,556 | 8,936 | |
Hemispheric | 168 | 1.07 | 81,430,082 | 17,872 | |||||||
Middle Jurassic | Proeryon giganteus | FSL 170603 | 9,100 | 90 | Quadratic | Flat | 101 | 0 | 65,038,822 | 8,100 | 8,029 |
Hemispheric | 159 | 1.13 | 130,077,644 | 16,059 | |||||||
UJF-ID 11547 | 11,000 | 88 | Quadratic | Flat | 125 | 0 | 95,033,178 | 7,744 | 12,272 | ||
Hemispheric | 196 | 0.92 | 190,066,356 | 24,544 | |||||||
UJF-ID 14020* | 11,600 | 78.8 | Quadratic | Flat | 147 | 0 | 105,683,177 | 6,209 | 17,020 | ||
Hemispheric | 231 | 0.78 | 211,366,354 | 34,040 | |||||||
UPMC-248 | NA | 77 | Quadratic | Flat | NA | NA | NA | 5,929 | NA | ||
Hemispheric | NA | NA | NA | NA | |||||||
Hellerocaris falloti | FSL 710108 | 1,900 | 62 | Quadratic | Flat | 31 | 0 | 2,835,287 | 3,844 | 738 | |
Hemispheric | 48 | 3.74 | 5,670,575 | 1,475 | |||||||
MNHN.F.A50709* | 850 | 24.25 | Quadratic | Flat | 35 | 0 | 567,450 | 588 | 965 | ||
Hemispheric | 55 | 3.27 | 1,134,900 | 1,930 | |||||||
Willemoesiocaris ovalis | MNHN.F.A29521* | 7,000 | 68.83 | Quadratic | Flat | 102 | 0 | 38,484,510 | 4,738 | 8,122 | |
Hemispheric | 160 | 1.13 | 76,969,020 | 16,245 | |||||||
Early Jurassic | Gabaleryon sp. | SMNS 67631 | 1,850 | 55 | Quadratic | Flat | 34 | 0 | 2,688,025 | 3,025 | 889 |
Hemispheric | 53 | 3.41 | 5,376,050 | 1,777 | |||||||
Coleia viallii | MSNM.i3368 | 5600 | 82 | Quadratic | Flat | 68 | 0 | 24,630,086 | 6,724 | 3,663 | |
Hemispheric | 107 | 1.68 | 49,260,173 | 7,326 | |||||||
Coleia barrovensis | NHMUK.I6589 | 4100 | 66 | Quadratic | Flat | 62 | 0 | 13,202,543 | 4,356 | 3,031 | |
Hemispheric | 98 | 1.84 | 26,405,086 | 6,062 |