A predatory Rusophycus burrow front the Cambrian of southern New Brunswick, eastern Canada

A specimen of the trilobite-produced trace fossil Rusophycus is intimately associated with the annelid-produced meandering burrow Helminthopsis hierog lyphica on the upper surface of an amalgamated quartz arenite of the King S quare Formation (late Middle - early Late Cambrian), Saint John Group, sout hern New Brunswick. Observations suggest that the rusophycid reflects, and is a rather unusual example of, predatory behaviour. Similar, but rare, exa mples have only occasionally been reported in the geologic record. The occu rrence documented herein is the first from strata of this age and also the first from Canada.