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Table 2.

Parameters used to calculate the optical sensitivity of Caligo memnon and Morpho peleides

SymbolParameterUnitCaligo memnonMorpho peleides
Δρ Acceptance anglea rad 0.036 0.028 
D Facet diameter μm 48 34 
l Rhabdom lengthb μm 902 860 
k Absorption coefficientc μm–1 0.0067 0.0067 
S Optical sensitivity μm2sr 1.3 0.4 
SymbolParameterUnitCaligo memnonMorpho peleides
Δρ Acceptance anglea rad 0.036 0.028 
D Facet diameter μm 48 34 
l Rhabdom lengthb μm 902 860 
k Absorption coefficientc μm–1 0.0067 0.0067 
S Optical sensitivity μm2sr 1.3 0.4 

The eye of C. memnon has an optical sensitivity S* (from Eqn 1) that is 3.3 times as high as that in the eye of M. peleides

a

The factor (d/f) in the original formulation of the sensitivity equation has been replaced by Δρ in our calculations

b

We used double rhabdom lengths in the calculations to account for the presence of a tapetum lucidum

c

k measured by Bruno et al.(Bruno et al., 1977)

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