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. Author manuscript; available in PMC: 2009 Mar 30.
Published in final edited form as: Photochem Photobiol. 2008 Mar 7;84(4):855–862. doi: 10.1111/j.1751-1097.2008.00310.x

Table 2.

The outer segment size (diameter × length, recorded in μm) of rods and cones in aquatic and terrestrial salamanders.

Aquatic (n = 3†) Terrestrial (n = 3†) P*
Red cone 6.0 ± 0.4 × 8.2 ± 0.2 6.0 ± 0.3 × 8.0 ± 0.2 >0.05
Red rod 12.4 ± 0.5 × 20.0 ± 1.3 11.0 ± 0.7 × 20.6 ± 0.9 >0.05
Green rod 9.8 ± 0.3 × 15.0 ± 0.7 10.2 ± 0.4 × 18.6 ± 0.3 <0.01
UV cone 3.1 ± 0.1 × 5.1 ± 0.2 2.9 ± 0.2 × 4.9 ± 0.3 <0.05

Values are mean ± standard deviation of 60 cells from each quadrant of three retinae in aquatic salamanders or 40 cells from each quadrant of three retinae in terrestrial salamanders.

†

Number of animals examined per category.

*

Statistical significance when comparing aquatic and terrestrial measurements per rod or cone type; significant values are in bold.