Treptichnus

Treptichnus; Temporal range:
	Burrows viewed from the side
	Burrows viewed obliquely
Trace fossil classification
Ichnogenus:	Treptichnus; Miller, 1889
Type ichnospecies
	Treptichnus bifurcus; Miller, 1889
Ichnospecies
	†T. apsorum Rindsberg & Kopasa-Merkel, 2005; †T. aequalternus Schlirf, 2000; †T. apsorum Rindsberg et Kopaska-Merkel, 2005; †T. arcus Wang et Wang, 2006; T. bifurcus Miller, 1889; †T. coronatum (Crimes et Anderson, 1985); †T. lublinensis Paczesna, 1986; †T. meandrinus Uchman, Bromley et Leszczyński, 1993; †T. pedum (Seilacher, 1955); †T. pollardi Buatois et Mángano, 1993; †T. rectangularis Orłowski et Żylińska, 1996; †T. streptosus Chen et Liu, 2025; †T. taijiangensis Wang et Wang, 2006; †T. triplex Palij, 1976; †T. vagans (Książkiewicz, 1977);
Synonyms
	Plangtichnus Miller, 1889; Manykodes Dzik, 2005; Affinovendia Sokolov, 1984;

Treptichnus is a genus of trace fossils (with modern analogues) representing a three-dimensional burrow. These fossil traces are known from marine, brackish, and freshwater deposits from the Ediacaran (550 million years ago) to the Upper Oligocene (24 mya).

Treptichnus represents the oldest known example of a complex, three-dimensional burrow. One of its ichnospecies, Treptichnus pedum, is of major paleontological importance as it defines the global boundary between the Ediacaran and Cambrian periods (539 mya).