ACTINOPTERYGII COPE, 1881

Sallan, Lauren Cole & Coates, Michael I., 2013, Styracopterid (Actinopterygii) ontogeny and the multiple origins of post-Hangenberg deep-bodied fishes, Zoological Journal of the Linnean Society 169 (1), pp. 156-199 : 158

ACTINOPTERYGII COPE, 1881

EURYNOTIFORMES (NOV.)

Type genus: Eurynotus Agassiz, 1833 –1844.

Included genera: Eurynotus Agassiz, 1833 –1844, Styracopterus Traquair, 1890 , Fouldenia White, 1927 , Benedenius Traquair, 1878 , Amphicentrum Young, 1866 , Cheirodopsis Traquair, 1881 , Paramesolepis Moy-Thomas & Bradley Dyne, 1938 , Wardichthys Traquair, 1875 , Proteurynotus Moy-Thomas & Bradley Dyne, 1938 , Mesolepis Young, 1866 .

Diagnosis: Actinopterygians with tall rectangular trunk scales bearing central pointed pegs at least 50% height of scale; jaw margins covered with thick ganoine and without visible teeth; premaxilla edentulous; dentary edentulous; maxillary dentition mesial to jaw margin and obscured laterally by dermal bone; palatal and mandibular tooth plates with denticles; maxilla with triangular posterior expanded portion and thick anterior ramus; mandible robust with acute symphysis in lateral aspect; snout blunt in lateral profile; preoperculum tall with horizontal pit line; suboperculum with anteroventral process; dorsal ridge scales prominent and acuminate, running from skull to dorsal fin origin; basal fulcra erect and pointed; median fins with longest fin ray more than fourth in position from leading edge; primary median fin lepidotrichia spine-like and without clear segments; fringing fulcra prominent, pointed, and overlapped distally on all fins. Symplesiomorphies: antorbitals absent; single median rostral; single nasal in contact with frontal and dermosphenotic; frontals longer than parietals; dermopterotic present; uninterrupted contact between preopercular and infraorbitals; supraorbitals absent; dermohyal present; single postcleithrum; axial lobe extending beyond caudal fin and axial fulcra with micromeric elliptical scales; epichordal fin present and distinct from caudal fin.