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A troglobite (or, formally, troglobiont) is an animal species, or population of a species, strictly bound to underground habitats, such as caves.These are separate from species that mainly live in above-ground habitats but are also able to live underground (eutroglophiles), and species that are only cave visitors (subtroglophiles and trogloxenes). [1]
Troglobite species are true cave dwellers, occurring exclusively in caves and unable to survive in the open. True troglobites among insects include many Coleoptera, some Stenopelmatidae, Diptera, and Zygentoma. Troglophile species sometimes occur outside the cave habitat but typically complete their life cycle in caves.
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Leptodirus hochenwartii is a true troglobite, adapted to subterranean life and unable to survive in the outside environment. As a result, it possesses typical troglobiotic features, such as elongated legs and antennae, the absence of wings, the absence of pigment in the integument, and anophthalmia (absence of eyes).
The species is endemic to granite talus caves in Yosemite National Park in California, United States. [3] The type specimens were found in two caves less than 0.5 kilometres (0.31 mi) within one the single scree.
Troglofauna usually live in moderate cave regions. [3] The overall climates of these caves do not significantly change throughout the year. Humidity in such caves is generally high ranging from 95 to 100 percent; evaporation rates are low.
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Troglomorphism is the morphological adaptation of an animal to living in the constant darkness of caves, characterised by features such as loss of pigment, reduced eyesight or blindness, and frequently with attenuated bodies or appendages.