Carpodaptes
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| Carpodaptes | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Plesiadapiformes |
| Family: | †Carpolestidae |
| Genus: | †Carpodaptes Matthew & Granger, 1921 |
Carpodaptes ("fruit eater" from Ancient Greek κᾰρπός (karpós), "fruit, grain" + δᾰ́πτης (dáptēs), "eater, consumer")[1] was a genus that encompassed small, insectivorous animals that roamed the Earth during the Late Paleocene. Specifically, Carpodaptes can be found between the Tiffanian and Clarkforkian periods of North America.[2] Although little evidence, this genus may have made it through to the early Eocene. They are known primarily from collections of jaw and teeth fragments in North America, mainly in southwestern Canada and northwestern America.[3] Carpodaptes are estimated to have weighed approximately 53-96 grams which made them a little bigger than a mouse. However small, Carpodaptes was a placental mammal within the order Plesiadapiformes that appeared to have a high fiber diet. This insect-eating mammal may have been one of the first to evolve fingernails in place of claws. This may have helped them pick insects, nuts, and seeds more easily off the ground than with paws or claws. Carpodaptes was thought to only exist in North America but recent discoveries of dentition fragments have been found in China.[4]
The fossil record of Carpodaptes is relatively sparse excluding jaw and teeth fragments. However, much can be concluded off of these few fragments. Their upper jaw had a dental formula of 2:1:3:3 and 2:1:2:3 on their lower jaw. Carpodaptes are characterized by their plagiaulacoid dentition seen on their first lower premolar. Their p4 had 5-7 apical cusps depending on the specimen.[3] This enlarged p4 would have potentially allowed the mammal to have crack open nuts and seeds as well as act as a slicing function on invertebrates. Their p3 is characterized by lingual apical cusps that are flattened and sometimes even concave.[4] In some species of Carpodaptes, their upper M1 indicates a specialized wedging function that acts in accordance with their p4. The varying development of dentition between Carpodaptes species indicates they were adapting their teeth to conform with a high fiber diet. However, their teeth are still rather primitive in comparison to other early-diverging primatomorpha of this era. Carpodaptes are also recognized by the loss of their p2, and some species even show to have a shortening of their mandible to potentially exert a greater biting force. Finally, their upper molars are studded and file-like which would have assisted with breaking open nuts and seeds.[3]
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