Pycnodontiformes genera

Gyrodus (from , 'curved' and 'tooth') is an extinct genus of pycnodontiform ray-finned fish that lived from the Middle Jurassic (Bajocian) to the Early Cretaceous (Barremian).

Pycnodus (from , 'dense' and 'tooth') is an extinct genus of ray-finned fish from the Eocene period. It is a wastebasket taxon, although many fossils from the Jurassic or Cretaceous are assigned to this genus, only the Eocene species, P. apodus is valid. As its name suggests, it is the type genus of Pycnodontiformes. thumb|left|Proscinetes bernardi, one example of pycnodont that was once assigned as Pycnodus The known whole fossils of Pycnodus are up to long, and have a superficial resemblance to angelfish or butterflyfish. The animals, as typical of all other pycnodontids, had many knob-like

Piranhamesodon pinnatomus is a pycnodontiform fish from the Late Jurassic (ca. ). It was described from the Plattenkalk deposits of the Solnhofen Formation, in Bavaria, Germany. It is notable for having sharp, serrated teeth highly reminiscent of a piranha, a highly unusual trait as most other species in the order Pycnodontiformes were shellfish eaters with flat, crushing teeth. It is also the oldest known bony fish with this trait. This unusual combination is reflected in its genus name, which is a combination of piranha and the frequent pycnodontiform genus suffix Mesodon. Fossils of other f

Mesturus is an extinct genus of ray-finned fish from the Jurassic.

Corusichthys is an extinct marine pycnodontiform that lived during the Late Cretaceous of what is now Lebanon. It contains a single species, C. megacephalus from the late Cenomanian-aged Haqel site of the Sannine Formation.'''' left|thumb|Life restoration C. megacephalus is known from a 34 mm long fossil. It had plates arranged like a helmet around its head, and had a massive, triangular spine on its dorsal side. C. megacephalus is closely related the genera Trewavasia and Hensodon, as well as Coccodus''.

Trewavasia carinata is an extinct pycnodontid fish in the family Coccodontidae that lived during the lower Cenomanian of what is now Lebanon. It had a large, forward-pointing horn-like spine between its eyes, and a massive stump-like spine emanating from the back of its head. T. carinata is closely related the genera Corusichthys and Hensodon, as well as Coccodus. It is named after Ethelwynn Trewavas. thumb|left|Artist's reconstruction

Coccodus is an extinct genus of marine pycnodontid fish that lived during the Late Cretaceous. The various species had a pair of massive, curved spines emanating from the lower sides of the head, and one curved spine on the top of its head. Unlike most pycnodontids (which tend to have short, marine butterflyfish-like bodies), Coccodus species had a comparatively long body, giving the living animals a superficial resemblance to a scaly chimaera.

Palaeobalistum is an extinct genus of prehistoric ray-finned fish which ranged from the Cretaceous to Eocene periods.

Acrotemnus is an extinct genus of marine pycnodontid ray-finned fish known from Europe, North America, and Africa during the Turonian stage of the Upper Cretaceous. North American species could reach comparatively giant sizes for pycnodonts.

Brembodus is an extinct marine pycnodontid fish, the type genus of the family Brembodontidae. It contains a single species, B. ridens, known from the Late Triassic Calcare di Zorzino formation of Cene, Italy.