Stygobromus allegheniensis has continuous light avoidance behavior which does not appear to follow circadian rhythmicity. White boxes indicate illuminated conditions.

 
 
  Part of: Espinasa L, Collins E, Finocchiaro A, Kopp J, Robinson J, Rutkowski J (2016) Incipient regressive evolution of the circadian rhythms of a cave amphipod. Subterranean Biology 20: 1-13. https://doi.org/10.3897/subtbiol.20.10010