Finichnus tortus (Rosso, 2008)

Small-sized Leptichnus, usually not exceeding two millimetres in diameter, formed by a group of one to two dozen closely spaced, shallow pits of elliptical to pyriform shape, often irregularly lobate at one or both end(s); lateral walls are abruptly vertical or slightly inclined toward the flat floor. Pits roughly 150-210 µm long by 100-120 µm wide. A larger, more circular pit measuring 280-320 µm by 210-230 µm, is present at the centre of the group. It is surrounded by the other pits, roughly arranged in spirals, marked by the alignment of pits and their slightly inclined long axes, occasionally disrupted by the insertion of isolated pits and new pit rows. Significantly smaller, usually round transverse elliptical pits are rarely interspersed between the larger pits, one or two often placed near the central pit.