NJfossils.comFossils from Monmouth County, New Jersey
Mackerel (Archaeolamna kopingensis aka Cretodus arcuatus aka Cretodus arcuata)
Age – Late Cretaceous; Commonality – Common; Size – average: ¾ inch, max: 9/8 inches
These teeth have a distinct look even when they are worn. They have a relatively robust triangular crown. They normally have a robust triangular cusplet on each side of the crown. The cusplets are rather massive for the size of the teeth and are thick at the base. They can sometimes have little secondary cusplets. The roots are bilobate. The lingual protuberance on these teeth juts out well on anterior teeth and diminishes a little in laterals and posteriors. The nutrient groove is missing on these teeth; instead, these teeth possess a nutrient pore. Some posterior teeth have ridges on the bottom of the labial face (these may not be present in all teeth). Laterals and posteriors are more curved distally than anteriors. This shark possessed two symphyseal/parasymphyseal teeth. It also had small intermediate teeth. The anteriors and laterals are enlarged in comparison to teeth of other positions. This shark had a crushing type of dentition.