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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]
A study on the anatomy of the pectoral region of the skeleton of Doliodus problematicus is published by Maisey et al. (2017). [21] A study on the phylogenetic relationships of the Devonian species "Ctenacanthus" latispinosus is published by Burrow et al. (2017), who transfer this species to the genus Doliodus. [22]
The Climatiiformes is an order of extinct fish belonging to the class Acanthodii.Like most other "spiny sharks", the Climatiiformes had sharp spines. These animals were often fairly small in size and lived from the Late Silurian to the Early Carboniferous period.
L. problematicus Traquair 1898 Lasanius is a genus of basal jawless fish from the Early Silurian , around 443.8 million years ago, known from fossils found near Lesmahagow , Scotland . Specimens range from 13.3 to 74.5 mm in length.
As of July 2016, the International Union for Conservation of Nature (IUCN) lists 2875 data deficient arthropod species. [1] 30% of all evaluated arthropod species are listed as data deficient.
Weigeltisauridae is a family of gliding neodiapsid reptiles that lived during the Late Permian, between 259.51 and 251.9 million years ago.Fossils of weigeltisaurids have been found in Madagascar, Germany, Great Britain, and Russia.