Warvichnium ulbrichi Walter, 1985

Description. Warvichnium ulbrichi Walter (1985) (Figs. 5C, 6A–D) is a complex, variably preserved structure. It is composed of a central straight to winding part and side parts, which may be symmetric or asymmetric. The central part, which is 2–7.5 mm wide, can be preserved as a single row of imbricated, concordantly open arcs (Fig. 6D). The arcs are about 0.5–2 mm wide and located 3–9 mm apart. In some cases onlytips of the arcs are seen. The central part can be also preserved as a double row of small pits, located 3–4 mm apart on each side of the row (Fig. 6E), or a double row or short, slightly arcuate bars, parallel or subparallel to the course of the trace fossil (Figs. 5C, 6B, C). The pits or bars are located along the boundaries of the central part. The side parts are preserved only in some specimens. Theyare composed of oblique bars, 10 mm long, 27 mm apart located at 2–5 mm aside from the centralpart (Fig. 6AD).,