Cruziana dispar (Linnarsson, 1869)

Emended diagnosis. – High, oval, symmetric hypichnion with a narrow, more or less distinct median furrow, which separates two lobes. The lobes are covered by distinct V-shaped ridges, which meet in the median furrow at an angle of 60–180°. The width of the ridges in the front and rear of the lobes can be different. The V-shaped patterns formed by the ridges are usually directed in oppo site directions at the front and rear of the traces.

Description. – Oval or slightly elongate, bilobate convex hypichnion, 70–120 mm long, 40–60 mm wide, 20–40 mm high, without distinct margins. On the surface of the lobes, distinct, regular ridges (interpreted as moulds of scratch marks), 1–3 mm wide, 3–4 mm apart, which meet in the median furrow at an angle of 60–100° and form a V-shaped pattern, oriented in one direction or in opposite directions in the front and rear parts of the oval. Generally, the ridges are thick, showing different widths in the front and rear parts of the lobes. Some of the specimens display thinner, second-order ridges on the margin of the hypichnion