Extinct Requiem Shark

Abdounia recticona (Winkler, 1873)

Age - Eocene - Commonality - Common

The teeth of Abdounia recticona are small, averaging about 5 mm (less than ¼ inch) with a triangular crown. Cusps number from 2 to 6, are broadly triangular and outwardly directed running up the cutting edge of the crown. The root is beveled with a strong nutrient grove. The crown does not overhang the root.
Abdounia recticona is broken into 2 subspecies based on the number of cusplets:
1. Abdounia recticona recticona (Winkler, 1873) 3-4 serrations per heel. Reported from the early to mid Eocene (Lutetian).      
2. Abdounia recticona. claibornensis, (White, 1956) 5-6 serrations per heel, Reported from the late to mid Eocene (Bartonian).
(Manning pers. com. 2017)
 

Abdounia recticona
Monmouth County, NJ.
 

All my personal finds have been limited to 2-4 cusplets.
 

The root of Abdounia recticona is beveled with a strong nutrient groove.

Some of my Abdounia recticona teeth in a gem jar

Monmouth County, NJ.

References

Cappetta H. 1992. Carcharhiniformes nouveaux (Chondrichthyes, Neoselachii) de l’Yprésien du Bassin de Paris. Geobios 25: 639-646

Kent, B. W. 1994. Fossil Sharks of the Chesapeake Bay Region. Egan Rees and Boyer, Inc., Columbia, MD, 146 pp.

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