Heimdallia

"Heimdallia" is an ichnogenus comprising a strange planar trace that does not have a circular cross-section; its maker may have been fed upon by "Beaconella".cite journal
author = McNamara, K.J.
coauthors = Trewin, N.H.
year = 1993
title = A euthycarcinoid arthropod from the Silurian of Western Australia
journal = Palaeontology
volume = 36
pages = 319-335]

The trace was probably made by a small crustacean.cite journal
author = Bradshaw, M.A.
coauthors = Harmsen, F.J.
year = 2007
title = The paleoenvironmental significance of trace fossils in Devonian sediments (Taylor Group), Darwin Mountains to the Dry Valleys, southern Victoria Land
journal = Antarctica: A Keystone in a Changing World--Online Proceedings of the 10 thISAES X, edited by AK Cooper and CR Raymond et al., USGS Open-File Report
volume = 1047
url = http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea133.pdf
accessdate = 2008-04-22]

References