Benthic organisms that live on or attached to rocky areas and firm sediments are collectively called epifauna, whereas animals that live buried in the substrate and are associated with soft sediments, such as mud or sand, are collectively called infauna.
Benthic is a term that refers to anything that belong to the bottom like that of the sea, ocean, lake, etc. There are various species of plants and animals that reside in the benthic region of the waterbodies. These organisms are termed as benthos.
Soft sediments are the structures formed due to the deformation of the solid particles like rocks. These include mud, silt, and sand. The soft sediments are the benthic region of the waterbodies where various organism reside.
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