A review of the glacial environment arthropod trace fossils Umfolozia and Warvichnium with the description of new ichnotaxa

Trace fossils are important records of the presence and behaviour of animals in the past, especially in deposits where few body fossils are preserved. They tend to provide the main palaeobiological record for past glacial environments and are thus very important for understanding the ecology of these palaeoenvironments. Two ichnogenera are common from past glacial environments: Umfolozia and Warvichnium. Both Umfolozia and Warvichnium are attributed to arthropods, and the former occurs across the Late Palaeozoic Ice Age (LPIA) and the latter occurs during both the LPIA and the Quaternary glacial event. Here, we review the stratigraphic record, ichnotaxonomy, palaeoecology, palaeoenvironments, and likely tracemakers of these two ichnogenera. In addition to assessing morphological ichnotaxobases, we use multivariate morphometric analysis and inferential statistical tests to support our ichnotaxonomic revisions. The diagnosis of Umfolozia is revised, with the description of a new ichnospec...