Diplacanthus
Diplacanthus is an extinct genus of Mid to Late Devonian fish in the class Acanthodii, known as spiny sharks.
Classification
The genus was named by Louis Agassiz in 1843. It was formerly regarded as belonging to the Climatiformes but recently reassigned to the Diplacanthiformes, in which it is united with, amongst others, Rhadinacanthus, Uraniacanthus, and Culmacanthus. Diplacanthiforms were widespread during the Middle and early Late Devonian. They are best represented in the Middle Devonian, by articulated fossils, fin spines, and abundant scales, the latter particularly from northern Europe.In a latest revision of the genus Diplacanthus, a large number of species from Europe were synonymized with earlier Scottish species, and these too were redefined. D. crassisimus was taken to have precedence over D. striatus as the name of the type specimen. Diplacanthus longispinus was reassigned to Rhadinacanthus longispinus, within which were also included Diplacanthus horridus and Diplacanthus ellsi. Diplacanthus tenuistriatus and Diplacanthus kleesmentae were however retained. Non-Laurussian species such as Diplacanthus acus from South Africa were not considered in this review.
In a 2025 paper, the species D. acus was reassigned to the new genus Angelacanthus.
Species
- †D. crassisimus Duff, 1842
- †D. gravis? Valiukevičius, 1986
- †D. kleesmentae? Valiukevičius, 1988
- †D. poltnigi? Valiukevičius, 2003
- †D. solidus? Valiukevičius, 1986
- †D. tenuistriatus Traquair, 1844