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* ''Domichnia'' are dwelling structures that reflect the life positions of organisms, for example the subsurface [[burrow]]s or [[bioerosion|borings]] of [[suspension feeder]]s, and are perhaps the most common of the established ethological classes.
* ''[[Fodinichnia]]'' are feeding traces which are formed as a result of organisms disturbing the sediment in their search for food. They are normally created by [[deposit feeder]]s as they tunnel through soft sediments, usually producing a 3D structure.
* ''Pascichnia'' are a different type of feeding trace for which the trophic guild responsible are [[grazing|grazer]]s. They create 2D features as they scour the
* ''Repichnia'' are locomotory tracks that show evidence of organisms moving from one station to another, usually in a near-straight to slightly curved line. Most of the very few traces to be verifiably assigned to a specific organism are in this category, such as various [[arthropod]] and [[vertebrate]] trackways.<ref>Seilacher, A (1967) Bathymetry of trace fossils. Marine Geology 5: 413-428.</ref>
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