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Since the inception of behavioural categorization, several other ethological classes have been suggested and accepted, as follows:
* ''Aedificichnia'':<ref>{{cite journal |last1=Bown |first1=T. M. |last2=Ratcliffe |first2=B. C. |year=1988 |title=The origin of ''Chubutolithes'' Ihering, ichnofossils from the Eocene and Oligocene of Chubut province, Argentina |journal=Journal of Paleontology |volume=62 |issue=2 |pages=163–167 |doi=10.1017/S0022336000029802 |bibcode=1988JPal...62..163B |s2cid=20261299 |url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1136&context=entomologypapers |url-access=subscription }}</ref> evidence of organisms building structures outside of the [[infauna]]l realm, such as [[termite]] mounds or [[wasp]] nests.
* ''Agrichnia'':<ref>Ekdale, AA; Bromley, RG; Pemberton, SG (1984) Ichnology: Trace fossils in sedimentology and stratigraphy. Society of Economic Paleontologists and Mineralogists Short Course, no 15, 317 pp.</ref> so called "gardening traces", which are systematic burrow networks designed to capture migrating [[meiofauna]] or perhaps even to culture [[bacteria]]. The organism would have continually inspected this burrow system to prey on any smaller organisms that strayed into it.
* ''Calichnia'':<ref>Genise, JF & Bown, TM (1991) New Miocene scarabaeid and hymenopterous nests and Early Miocene (Santacrucian) palaeoenvironments, Patagonian Argentina. Ichnos, 3: 107–117.</ref> structures that were created by organisms specifically for [[Reproduction|breeding]] purposes, e.g. [[bee]] cells.
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