Description:Thalassinoides is a branching burrow (Y- or T-shaped branches) with either horizontal, oblique, or vertical box-like networks and enlargements at junctions between some branches. Unlike Ophiomorpha, Thalassinoides has smooth walls. Thalassinoides is interpreted as a combined feeding and dwelling burrow, but has been observed as a boring in some cases. The probable tracemaker was an arthropod.
