Muensteria is the ichnogenus of a type of trace fossil that is found in sedimentary rocks, and is thought to represent the horizontal burrow of a marine invertebrate organism. It is a horizontal, non-branching, unlined, tube-like burrow characterized by menisci, which are concave to flat laminae within the burrow created as the organism packs sediment and fecal material behind it when moving forward in the burrow. Muensteria is one example of a meniscate burrow.^[1][2]

Muensteria
Muensteria trace fossil from the Temblor Formation (Lower Miocene) of Kern County, California. Note the menisci (back-filling structures) in the burrow.
Trace fossil classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Annelida
Clade:	Pleistoannelida
Clade:	Sedentaria
Order:	Sabellida
Family:	Sabellidae
Ichnogenus:	†MuensteriaSternberg, 1833 html.skin-theme-clientpref-night .mw-parser-output .infobox.biota tr{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .infobox.biota img{background:white}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox.biota tr{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .infobox.biota img{background:white}} See also edit Trace fossil Ichnology References edit   Wikimedia Commons has media related to Muensteria. ^ Chamberlain, C. K. (1978). "Recognition of trace fossils in cores". In Basan, P.N. (ed.). Trace Fossil Concepts - SEPM Short Course No. 5. Oklahoma City: Society of Economic Paleontologists and Mineralogists. pp. 133–162. ^ Howard. J. D. & Frey, R. W. (1984). "Characteristic trace fossils in nearshore to offshore sequences, Upper Cretaceous of east-central Utah". Canadian Journal of Earth Sciences. 21 (2): 200–219. Bibcode:1984CaJES..21..200H. doi:10.1139/e84-022.