Aspinothoracidi

{{Automatic taxobox

| fossil_range = Late Devonian, ~{{Fossil range|382.7|372.2}}

| image = Hadrosteus rapax.jpg

| image_caption = typical aspinothoracid, Hadrosteus

| taxon = Aspinothoracidi

| authority = Stensiö, 1959

| subdivision_ranks = Subgroups

| subdivision =

}}

Aspinothoracidi is a clade of placoderms, extinct armored fish most diverse during the Devonian. The gigantic apex predator Dinichthys, is the best-known member of this group. Many other genera, such as the infamous Dunkleosteus, were previously thought to be close relatives of Dinichthys and were grouped together in the family Dinichthyidae, though more recent studies have restricted that family to only its type species.{{cite journal | author =Carr R. K., Hlavin V. J. | title =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) | journal =Zoological Journal of the Linnean Society | volume =159 | issue =1 | pages =195–222 | year =2010 | doi =10.1111/j.1096-3642.2009.00578.x | doi-access =free }}

Phylogeny

Eubrachythoraci is divided into the clades Coccosteomorphi and Pachyosteomorphi, the latter of which can be further sub-divided into Aspinothoracidi and Dunkleosteoidea, as shown in the cladogram below:{{Cite journal |last1=Zhu |first1=You-An |last2=Zhu |first2=Min |last3=Wang |first3=Jun-Qing |date=1 April 2016 |title=Redescription of Yinostius major (Arthrodira: Heterostiidae) from the Lower Devonian of China, and the interrelationships of Brachythoraci |journal=Zoological Journal of the Linnean Society |volume=176 |issue=4 |pages=806–834 |doi=10.1111/zoj.12356|issn=0024-4082 |doi-access=free }}

{{clade| style=font-size:85%;line-height:85%

|label1=Eubrachythoraci

|1={{clade

|label1=Coccosteomorphi

|1={{clade

|label1=Coccosteoidea

|1={{clade

|label1=Coccosteidae

|1={{clade

|1=Millerosteus minor

|2=Coccosteus cuspidatus }}

|2={{clade