Treptichnus rectangularis Orłowski et Żylińska, 1996

Diagnosis. Horizontal burrows consisting of a system of short units, 3-5 mm in diameter and up to 40 mm long each, emerging alternately or on the same side from the periapertural part of the preceding unit and opening vertically to the surface. Units are irregularly shaped and almost devoid of ornamentation, they were created parallel and right below the water/sediment interface. The walls of burrows were stiffened; the organisms produced faecal pellets 0.3 mm in diameter and up to 1 mm long.