Biol. Lett. 10, 20140412. (Published online 1 July 2014) (doi:10.1098/rsbl.2014.0412)
Some of the data were incorrectly entered on the spreadsheets. We have replaced the electronic supplementary material and here we provide a corrected version of table 1. There are also some errors in the text. The first sentence of §2 should read 21 specimens instead of 25. At the end of the first paragraph of §3, R2 = 0.82 for A. cummingsi, not 0.75. In the second paragraph of §3, the number for Limulus is 674 not 680. In the fifth paragraph of §3, the IOA in A. cummingsi ranges from 1.5° not 1.8°; later in the same paragraph, that for Limulus ranges from 1.8° not 1.7° and that for Eurypterus ranges to 1.7° not 1.8°. In the final paragraph of §3, the values of P for A. cummingsi range to 16 not 17 and those for Eurypterus range from 0.5 not 0.4. These errors do not alter the conclusions of the paper.
Table 1.
Data on eyes.
| A. cummingsi | Eurypterus sp. | Limulus | |
|---|---|---|---|
| eye size (mm2) | |||
| range | 153–257 | 4–33 | |
| mean ± s.d. | 198.14 ± 37.00 | 16.14 ± 6.37 | |
| n (eyes, individuals) | 7, 5 | 34, 21 | |
| number of lenses | |||
| range (estimates based on extrapolation) | 1167–1792 | 3156–6733 | 426–944 |
| mean ± s.d. | 1407 ± 226 | 4746 ± 1098 | 674 ± 174 |
| n (eyes, individuals) | 7, 5 | 15, 13 | 8, 7 |
| size of lenses (mm) | |||
| range | 0.27–0.37 | 0.03–0.07 | 0.10–0.26 |
| mean ± s.d. | 0.32 ± 0.04 | 0.05 ± 0.01 | 0.14 ± 0.06 |
| n (eyes, individuals, lenses per eye) | 7, 5, 20 | 15, 13, 20 | 7, 6, 20 |
| interommatidial angle (°) | |||
| range | 1.5–2.9 | 0.9–1.7 | 1.8–3.7 |
| mean ± s.d. | 2.01 ± 0.58 | 1.13 ± 0.27 | 2.87 ± 0.74 |
| n (eyes, individuals) | 5, 5 | 13, 11 | 7, 6 |
| eye parameter (P) | |||
| range | 6–16 | 0.5–1.5 | |
| mean ± s.d. | 9.66 ± 4.18 | 0.79 ± 0.33 | |
| n (eyes, individuals) | 5, 5 | 13, 11 | |