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Fossils from Monmouth County, New JerseyThresher (Paranomotodon angustidens)
Age – Late Cretaceous; Commonality – Uncommon; Size – ¼ – ¾ inches
Thresher shark teeth are somewhat ignored by collectors, probably because their features are worn down easily by stream action, which causes them to be mistaken for a worn goblin, porbeagle, or sand tiger. Nice threshers are hard to come by. The crown is similar to Archaeolamna kopingensis teeth. The thresher crown is less robust and is thinner on the carinae. Thresher teeth have small vestigial cusplets, which look like small bumps on the shoulders of the tooth. They are almost like extensions of the crown. The thresher roots are slightly porous and have a large nutrient groove. The anterior tooth crowns are straight and the laterals are angled distally. The upper teeth are generally flatter and less robust than the lowers.
Symphyseal Tooth
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
This is a rather strange tooth. It is possibly a symphyseal P. angustidens. There is also the chance that it is a positional variation of a Protolamna borodini. In my opinion it matches better with this species.
Anterior Teeth
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
This tooth is most likely an upper anterior.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Here is another anterior; it is probably an upper.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
This tooth is most likely a lower anterior.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
This tooth is either an upper first anterior or a lower anterior.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Another lower anterior.
Lateral Teeth
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
Lateral teeth are much more slanted than the anteriors. This one is most likely an upper.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
Here is another possible upper lateral with a different shape.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
Another upper lateral similar to the one above.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
Lower laterals are more erect than the upper laterals.
Posterior Teeth
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
Posteriors are slanted like the upper laterals, but have a narrower root. This one is probably an upper.
Lingual View
Labial View
Profile View of Mesial Side
Profile View of Distal Side
Basal View
Occlusal View
This one has a somewhat unusual shape.