In the case of N. fissuratus, the perpetuator was likely sparassodont metatherians, one of the few compelling evidence of this kind of predator-prey in the South American fossil record.

These large punctures on the symphiseal part of the jaws are consistent with predation by metatherians, as practiced by living didelphids

We describe a new ichnospecies, Nihilichnus fissuratus isp. nov., which are constituted of symmetrical marks on the mandibles, likely from antagonistic teeth.

I'll make a presentation on #SVP2025 about what may be the first indications of predation by sparassodonts, an extinct group of South American metatherian predators.

I will present today about the geographic and sexual skull variation in yellow-throated martens (subgenus Charronia) at the "General Morphology and Morphological Evolution 1" session of #ICVM2025

I will be talking about cranial evolution in martens, wolverines, and tayras tomorrow at the "Macroevolução 2" session of the I Congresso Brasileiro de Biologia Evolutiva, in Curitiba, Brazil! #SBBE #SBBE24 #biologiaevolutiva