Dinichthys

Dinichthys (from Greek: δεινός deinós, 'terrible' and Greek: ἰχθύς ichthys 'fish') is an extinct monospecific genus of large marine arthrodire placoderm from the Late Devonian (Famennian stage) measuring around 3 metres (9.8 ft) long.[1] Fossils were recovered from the Ohio Shale Formation along the Olentangy River in Delaware County, Ohio.

Dinichthys
Temporal range: Late Devonian: Famennian,
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Placodermi
Order: Arthrodira
Clade: Phlyctaenioidei
Suborder: Brachythoraci
Clade: Eubrachythoraci
Clade: Pachyosteomorphi
Clade: Aspinothoracidi
Genus: Dinichthys
Newberry, 1868
Species
  • Dinichthys herzeri Newberry, 1868 (type)
Synonyms
  • Ponerichthys Miller, 1892

Classification History

Dinichthys was originally described in 1868 by John Newberry on the basis of an incomplete skull roof and mandibles (holotype AMNH 81). Subsequently, many unrelated large arthrodires were originally classified together within this genus, including species now assigned to Dunkleosteus, Eastmanosteus, and Titanichthys. Notably, the type species of Dunkleosteus was originally described as Dinichthys terrelli by Newberry in 1873, and was later separated into Dunkleosteus by Jean-Pierre Lehman in 1956. Dunkleosteus was still thought to be closely related to Dinichthys, and they were grouped together in the family Dinichthyidae. However, in the 2010 Carr & Hlavin phylogenetic study, Dunkleosteus and Dinichthys were found to belong to two separate clades. Carr & Hlavin resurrected the family Dunkleosteidae and placed Dunkleosteus, Eastmanosteus, and a few other genera from Dinichthyidae within it.[2] Dinichthyidae, in turn, is left a monospecific family[3] and dismissed as a family grouping,[4] and the genus Dinichthys is now considered a monotypic genus, containing only the type species, D. herzeri.[2]

Phylogeny

Dinichthys is a member of the clade Aspinothoracidi, which belongs to the clade Pachyosteomorphi, one of the two major clades within Eubrachythoraci. The cladogram below shows the phylogeny of Dinichthys:[5]

Eubrachythoraci 

Coccosteomorphi

 Pachyosteomorphi 

Rhachiosteus pterygiatus

Dunkleosteoidea 

Eastmanosteus calliaspis

Eastmanosteus pustulosus

Kiangyousteus yohii

Golshanichthys asiatica

Westralichthys uwagedensis

Dunkleosteus raveri

Dunkleosteus terrelli

Dunkleosteus amblyodoratus

 Heterostiidae 

Heterosteus ingens

Yinosteus major

Aspinothoracidi

Tapinosteus heintzi

Bullerichthys fascidens

Kendrickichthys cavernosus

Bruntonichthys multidens

Dinichthys herzeri

Hadrosteus rapax

Gorgonichthys clarki

 Selenosteidae 

Heintzichthys gouldii

Pachyosteus bulla

Gymnotrachelus hydei

Stenosteus angustopectus

Brachyosteus dietrichi

Melanosteus occitanus

Rhinosteus parvulus

References

  1. Bashford Dean (1895). Fishes, Living and Fossil: An Outline of Their Forms and Probable Relationships. Macmillan and Company. p. 130. Retrieved 2022-08-28.
  2. Carr, R.K.; Hlavin, W.J. (2010). "Two new species of Dunkleosteus Lehman, 1956, from the Ohio Shale Formation (USA, Famennian) and the Kettle Point Formation (Canada, Upper Devonian), and a cladistic analysis of the Eubrachythoraci (Placodermi, Arthrodira)". Zoological Journal of the Linnean Society. 159 (1): 195–222. doi:10.1111/j.1096-3642.2009.00578.x.
  3. Carr, Robert K.; William J. Hlavin (September 2, 1995). "Dinichthyidae (Placodermi):A paleontological fiction?". Geobios. 28: 85–87. doi:10.1016/S0016-6995(95)80092-1.
  4. You-An Zhu; Min Zhu (2013). "A redescription of Kiangyousteus yohii (Arthrodira: Eubrachythoraci) from the Middle Devonian of China, with remarks on the systematics of the Eubrachythoraci". Zoological Journal of the Linnean Society. 169 (4): 798–819. doi:10.1111/zoj12089.
  5. Zhu, You-An; Zhu, Min; Wang, Jun-Qing (1 April 2016). "Redescription of Yinostius major (Arthrodira: Heterostiidae) from the Lower Devonian of China, and the interrelationships of Brachythoraci". Zoological Journal of the Linnean Society. 176 (4): 806–834. doi:10.1111/zoj.12356. ISSN 0024-4082.


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