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Stygobites are thought to be wider ranging than troglobites in the contiguous 48 United States. This assumption is confirmed by showing that stygobite species are recorded from more counties than troglobite species (Mann Whitney U = 80189, Z = −6.781, P < 0.0001). The properties of water flow through caves may allow greater dispersal opportunities for stygobites above the normal water table during floods and could be one reason for the larger ranges of these species.
Journal of Cave and Karst Studies, Vol. 66, no. 1 (2004).
1 online resource
Lamoreux, John, "Stygobites Are More Wide-ranging than Troglobites" (2004). KIP Articles. 5286.