Teichichnus rectus Seilacher, 1955

Remark. T. rectus has been the most common ichnospecies of Teichichnus since the early Cambrian (e.g.Orłowski, 1989; Pacześna, 1996; McIlroy and Brasier, 2017) and has a global record throughout the Phanerozoic (Fig.7,8).Although also known from the Holocene (Wetzel, 1981; Corner and Fjalstad, 1993; Werner, 2002), noconclusion about its trace makers has been reached and producers of several phyla are likely in light of its long age range (Häntzschel, 1975)-

Diagnosis Vertical bladelike spreiten structures consisting of several closely concentric, horizontal or inclined, longitudinally nested individual burrows adjoining single parent tninks; burrows within the spreite are displaced upward (retrusive).

Diagnosis Long, straight, planar to slightly irregular, retrusive spreiten structures oriented at various angles with respect to bedding.

Irregularly arranged, densely crowded, mutually cross-cutting spreiten-structures resembling troughs filled up in a vertical plane. These are preserved in full reliefs, partly weathered-out, on an upper bedding plane of the sandstone slab. The troughs are straight; preserved parts are 1–7 cm long and ca 4 mm wide. The trace is composed usually of a small number (2–4) of troughs. In vertical plane, all traces probably show a shape of a very broad “U” letter.