Fig. 2. The crustacean burrow Sinusichnus sinuosus Gibert, 1996 in Recurrent constructional pattern of the crustacean burrow Sinusichnus sinuosus from the Paleogene and Neogene of Spain

Fig. 2. The crustacean burrow Sinusichnus sinuosus Gibert, 1996 from the Eocene Vilomara outcrop in the Ebro Basin, Spain. A. System displaying the characteristic sinuous tunnels and Y-shaped branching. Upper part of the burrow is concave as only spreiten are preserved and the final passive infill of the tunnel is lacking. B. Two intersecting burrows. The one on the lower part of the picture displays a typical H-shaped geometry. C. Sinuous tunnel showing retrusive spreiten. Field photographs.