†Ptychodus polygyrus concentricus Agassiz 1839 (mackerel shark)
Chondrichthyes - Lamniformes - Ptychodontidae
Full reference: L. Agassiz. 1839. Recherches Sur Les Poissons Fossiles. Tome III (10me, 12me livraison) 141-156
Belongs to Ptychodus polygyrus according to L. Agassiz 1839
See also Herman 1977
Sister taxon: Ptychodus polygyrus marginalis
Ecology: nektonic carnivore
Distribution: there are no occurrences of Ptychodus polygyrus concentricus in the database