Helicoprionidae

Helicoprionidae (sometimes called Agassizodontidae) is an extinct family of holocephalans within the order Eugeneodontiformes. Members of the Helicoprionidae possessed a unique structure called a tooth whorl connected by a single root along the midline of the lower jaw.

The structure of tooth whorls varies, with some having highly specialized, coiling spirals (such as those of the iconic genus Helicoprion), while others such as Sarcoprion and Parahelicoprion possessed shorter whorls.

 Genera 

 Agassizodus
 Arpagodus
 Campyloprion
 Helicoprion
 Hunanohelicoprion
 Karpinskiprion
 Parahelicoprion
 Sarcoprion
 Shaktauites
 Sinohelicoprion
 Toxoprion

 Gallery 


 References 
Category:Cartilaginous fish

 Other websites 

 Palaeos Vertebrates 70.100 Chondrichthyes: Eugnathostomata at paleos.com
 https://www.gbif.org/species/4825206