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Subterranean fauna
Subterranean fauna are animals that have adapted to live underground. Troglofauna and stygofauna are the two types or groups of subterranean fauna (based on life-history). Both are associated with subterranean environments – troglofauna are associated with caves and spaces above the water table and stygofauna with groundwater or aquifers. Adaptations to the subterranean environment include a heightened sense of hearing, touch and smell or swimming-like appendages for aquatic animals and loss of under-used or unnecessary senses, apparent in the lack of pigmentation and eyesight of most subterranean fauna.
==Environment==
Subterranean fauna are found worldwide and include representatives of many animal groups, namely invertebrates. However, there are a number of vertebrates although they are less common.
Approximately 90% of caves worldwide remain undiscovered due to lack of visible entrances and more habitat exists in fissures, vugs and other spaces. Consequently, many species are yet to be discovered.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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