''Nihilichnus'' is an ichnogenus of trace fossil. It was first described from bite traces in 2006. The ichnogenus contains two ichnospecies, ''Nihilichnus nihilicus'' and ''Nihilichnus mortalis.'' The ichnogenera '' Brutalichnus'' and ''

Machichnus ''Machichnus'' is an ichnogenus. It was erected by Mikuláš et al. (2006) for shallow, thin, discrete, parallel to subparallel, smooth-bottomed scratches, occurring on bone tissue in small groups or series. According to modern analogues, the se ...

'' were described in the same paper.

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