Until recent interest in and comprehensive collection of stygofauna (Eberhard et al., 1991; Eberhard & Spate, 1995), few stygobiont amphipods were known, although there was suggestion of greater numbers than had been described (Knott, 1983, 1985; Williams, 1986).
Source: wiktionary
For example, stygobiont diving beetles (Dytiscidae) breath at the water surface while stygobiont crustaceans in the same system respire within the water; so the crustaceans, but not beetles, could potentially disperse through subterranean water lacking contact with the air. Conversely, stygobiont species, typically long-lived and lacking resting stages, are dependent on the permanent presence of groundwater.
Source: wiktionary
The stygobiont anthurids are only present in the tropics.
Source: wiktionary
Stygobionts overwhelmingly comprise crustaceans belonging to many higher taxa, including those with broad ecological and geographical distributions (such as Copepoda, Ostracoda, Amphipoda, Isopoda, and Decapoda).
Source: wiktionary
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