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Spines of individuals with 1-2 dentine layers are likely juveniles and result in the smallest sizes, whereas individuals showing at least 3-4 dentine layers result in two separate size classes. [10] The cross section is oval near the opening of the pulp cavity and circular/subtriangular in the distal part of the non-denticulated region and ...
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]
†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
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.
Doliolidae is a family of tunicates in the order Doliolida.Members of the family are pelagic and often found far away from coastlines. [1]Members of the family are transparent, gelatinous, barrel-shaped or cylindrical marine organisms.
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.
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 .