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. 2011 Mar 21;108(14):5702–5707. doi: 10.1073/pnas.1013850108

Fig. 1.

Fig. 1.

Pigmentation differences in cave, surface, and backcross individuals of A. aquaticus. (A) Surface male from Planina Polje surface waters. (B) Cave male from Planina cave (Pivka channel). Heads of surface (C), cave (D), and backcross (E–J) animals. Arrows show the eye spots. (E and K) No eye or head pigmentation. Brown dots are debris on the exterior of the animal. (F) Faint red eye and no head pigmentation. (G and L) Red eye and head pigmentation. (H and M) Orange eye and head pigmentation. (I and N) Brown eye pigment and diffuse brown pigmentation. (J) Brown eye pigment and stellate brown pigmentation. (Scale bar: 0.25 mm; applies to C–J). The gut in individuals (E–H and J) is brown from eating decaying leaves.