Table 1.

Troglomorphic traits.

	Constructive traits	Regressive traits
Morphology	Head or limb elongation and flattening, olfactory system, inner ear, taste buds, lateral line system	Eye loss, depigmentation, limb reduction, digit loss, reproductive anomalies
Physiology	Starvation resistance	Weakened circadian rhythm, lower metabolic rate
Behavior	Feeding habits	Loss of aggressive behavior or complex social behaviors
Life history	Increased offspring size, longevity	Reduced clutch or litter size