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The oldest known specimen of Orthacanthus, Diplodus problematicus, was found in New Brunswick, Canada, in the Lower Devonian (Emsian, c. 407 to 393 million years ago). [5] Other specimens have been found in locations including the US, the United Kingdom, Poland, and France.
†Doliodus Traquair, 1893 †Doliodus latispinosus Whiteaves, 1881 †Doliodus problematicus Woodward, 1892 †Doratodus Schmid, 1861 †Doratodus tricuspidatus Schmid, 1861 †Dorsetoscyllium Underwood & Ward, 2004 †Dorsetoscyllium terraefullonicum Underwood & Ward, 2004 †Duffinodus Popov, 2003 †Duffinodus nikolaii Popov, 2003
Burrow et al. 2016 provides vindication by finding chondrichthyans to be nested among Acanthodii, most closely related to Doliodus and Tamiobatis. [2] A 2017 study of Doliodus morphology points out that it appears to display a mosaic of shark and acanthodian features, making it a transitional fossil and further reinforcing this idea. [5]
Tarrasius problematicus (of Mississippian origin, ~ 350 Ma) featured a fully regionalized tetrapod-like spine divided into 5 distinct segments. [ 5 ] [ 6 ] It is not considered a transitional fossil though, but an extreme example of convergent evolution .
The Solnhofen Limestone or Solnhofen Plattenkalk is a collective term for multiple Late Jurassic lithographic limestones in southeastern Germany, which is famous for its well preserved fossil flora and fauna dating to the late Jurassic (Kimmeridgian-Tithonian).
Furthermore, previous models for European ancestry suggested that European populations descended from two ancient populations, but genetic evidence now suggests that a third ghost population, the Ancient North Eurasians, has also contributed to European ancestry.