Talking about fauna

Cryofauna[edit]
Cryofauna refers to the animals that live in, or very close to, cold areas.
Cryptofauna[edit]
Cryptofauna are the fauna that exist in protected or concealed microhabitats.^[2]
Epifauna[edit]
Epifauna, also called epibenthos, are aquatic animals that live on the bottom substratum as opposed to within it, that is, the benthic fauna that live on top of the sediment surface at the seafloor.
Infauna[edit]
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This time-lapse movie shows images taken every hour during a two-week period. Worms, bacteria and fish are shown disturbing the sediment as they burrow and move through it.
Infauna are benthic organisms that live within the bottom substratum of a water body, especially within the bottom-most oceanic sediments, the layer of small particles at the bottom of a body of water, rather than on its surface. Bacteria and microalgae may also live in the interstices of bottom sediments. In general, infaunal animals become progressively smaller and less abundant with increasing water depth and distance from shore, whereas bacteria show more constancy in abundance, tending toward one million cells per milliliter of interstitial seawater.
Such creatures are found in the fossil record and include lingulata, trilobites and worms. They made burrows in the sediment as protection and may also have fed upon detritus or the mat of microbes which tended to grow on the surface of the sediment.^[3] Today, a variety of organisms live in and disturb the sediment. The deepest burrowers are the ghost shrimps (Thalassinidea), which go as deep as 3 metres (10 ft) into the sediment at the bottom of the ocean.^[4]
Limnofauna[edit]
Limnofauna refers to the animals that live in fresh water.
Macrofauna[edit]
Macrofauna are benthic or soil organisms which are retained on a 0.5 mm sieve. Studies in the deep sea define macrofauna as animals retained on a 0.3 mm sieve to account for the small size of many of the taxa.