Baird first recorded the presence of this ichnotaxon in 1959, identifying it as a "...problematic double-gouge ichnite..." in his field notes (Baird MS, p.
The original diagnosis was revised by Haubold (1971), who described this ichnite as an ectaxonic track, asymmetric, from semiplantigrade to plantigrade.
The Upper Cretaceous and lowermost Paleocene deposits of South-central Pyrenees (Northern Spain) have yielded abundant palynological, macrophytes and vertebrate sites, the latter containing bones, eggs, and ichnite assemblages.
Commingled with the invertebrate trace fossils are abundant vertebrate ichnites, including: Batrachichnus and Characichnos, which were produced by temnospondyl amphibians; Notalacerta, which was produced by diapsid reptiles; and Undichna, which was produced by fish (Getty et al.
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