Teilhardina

Teilhardina[1][2] Temporal range: 56–47 Ma PreЄ Є O S D C P T J K Pg N Early Eocene - Middle Eocene
Teilhardina belgica
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Suborder:	Haplorrhini
Family:	†Omomyidae
Genus:	†Teilhardina Simpson, 1940
Species
†Teilhardina crassidens †Teilhardina belgica †Teilhardina americana †Teilhardina brandti †Teilhardina demissa †Teilhardina tenuicula †Teilhardina asiatica †Teilhardina magnoliana

Teilhardina was an early marmoset-like primate that lived in Europe, North America and Asia during in the Early Eocene epoch, about 56-47 million years ago.^[1][3] The paleontologist George Gaylord Simpson is credited with naming it after the French paleontologist, Jesuit and philosopher Teilhard de Chardin. It is known from quite a few species:

• †Teilhardina crassidens
• †Teilhardina belgica
• †Teilhardina americana
• †Teilhardina brandti
• †Teilhardina demissa
• †Teilhardina tenuicula
• †Teilhardina asiatica
• †Teilhardina magnoliana

The carbon isotope excursion suggests that the Asian Teilhardina asiatica is the oldest, the youngest is the North American Teilhardina americana and Teilhardina brandti.^[4]

There are four hypotheses that have been proposes to try and explain the geographic distribution:^[4]

1. Africa was the origination of the primates and then they dispersed to Europe- Greenland and finally North America.

2. Primates originated in North America then dispersed to Asia through the Bering route and later passed through Greenland to ` finally reach Europe.

3. Primates originated in Asia or Africa and dispersed through North America and finally reaching western Europe.

4. Asia was the primate’s origination, they then dispersed eastward towards North America and westward to Europe.

At one point a hypothesis arose that the primates may have originated in India prior to Asia plate collision near the Paleocene Eocene boundary and they spread into Asia after it collided.^[4]

These hypotheses were re-evaluated using new morphological evidence and earliest records of Teilhardina species involved from the continents (e.g. Asia, Europe, Africa etc.). The researchers concluded that none of the hypotheses fit the pattern that had emerged from their studies.^[4]

A new hypothesis arose from the research; it is now believed that at the beginning of the Paleocene–Eocene Thermal Maximum the Teilhardina dispersed from east to west near the Northern Hemisphere. The earliest primates migrated via crossing the Turgai Straits from South Asia to Europe. Finally, dispersing to the Northern America through Greenland. In simplest terms, it is as follow: westward Asia-to-Europe-to-North America.^[4]

The placement of this genus is uncertain and it is likely to be polyphyletic.^[5] Two species (T. belgica and T. asiatica) appear to be haplorrhine. The others appear to be anaptomorphine omomyids (and thus more closely related to the tarsiers than to simians) and should have a new genus erected.^[6]

References