Machichnus fatimae Araújo-Júnior, Barbosa et Silva, 2017

Description: Traces occur on the lateral and medial surfaces of the diaphysis. In the former, the grooves are positioned near the distal end; while they are distributed along the central part of the diaphysis in the latter (Fig. 4A). In the lateral surface, there are four grooves parallel each other. The average length of the grooves is around 1.97 cm and the average width is 0.4 cm. In the medial surface, there are five grooves parallel each other (Fig. 4B). The average length of the grooves is around 3.58 cm and the average width is 0.26 cm. Differently from the features assigned to M. bohemicus above, the grooves of MCC 491-V are arcuate (Fig. 4B, D). Furthermore, one of the traces of the medial surface presents branching (Fig. 4C). Notably, striae are visible in the inner part of the traces (Fig. 4C), however, they are also visible on the bone surface unaltered by traces, revealing that striae are a natural characteristic of the megamammal bone substrate, that is, they are not ichnological structures.