The as a shallow mole-tunnel-like burrow produced just below the sediment surface and consists of a series of horizontal tubular segments where one end connects to the previous segment, and the other is oriented upwards, providing an opening to the surface. The segments can be straight or curved, and arranged in a linear or zigzagging pattern. Fossil traces from continental freshwater deposits, known from the
Carboniferous to the Oligocene, most likely belonged to
insect larvae, analogous to modern burrows produced by
chironomids larvae. ==References==