Suidae from Kanapoi

Area of Science:

• Paleontology
• Vertebrate Paleontology
• Mammalian Evolution

Background:

• The Pliocene fossil record of African Suidae is crucial for understanding pig evolution.
• Nyanzachoerus and Notochoerus are key genera in Pliocene African ecosystems.
• Previous studies have highlighted taxonomic uncertainties within these genera.

Purpose of the Study:

• To revise the Suidae collection from Kanapoi, Kenya.
• To investigate the systematic relationships and evolutionary history of Nyanzachoerus and related genera in Eastern Africa during the Pliocene.
• To clarify the phylogenetic position of Notochoerus jaegeri and its potential ancestors.

Main Methods:

• Revision of fossil Suidae material from Kanapoi.
• Comparative morphological analysis of dental and cranial remains.
• Phylogenetic inference based on dentition characteristics.
• Examination of comparative collections from Uganda and Ethiopia.

Main Results:

• The Kanapoi Suidae collection comprises two species: Nyanzachoerus kanamensis and Notochoerus jaegeri.
• Premolar morphology shows overlap between the two species, but m3 morphology is distinct.
• Populations from Uganda and Ethiopia exhibit intermediate characters, suggesting Notochoerus jaegeri may be descended from a Nyanzachoerus kanamensis-like ancestor.
• Cranial remains of Notochoerus jaegeri from Kanapoi are limited, hindering definitive affinity assessment.
• Notochoerus euilus may be descended from Notochoerus jaegeri based on dentition.
• The absence of Kolpochoerus at Kanapoi during this period is noted but unexplained.

Conclusions:

• The Pliocene Suidae fauna of Kanapoi is characterized by Nyanzachoerus kanamensis and Notochoerus jaegeri.
• Evidence suggests a potential evolutionary link between Notochoerus jaegeri and Nyanzachoerus kanamensis, supported by East African populations outside Kenya.
• Further cranial evidence is needed to confirm the affinities of Notochoerus jaegeri.
• The phylogenetic placement of Notochoerus euilus is provisionally linked to Notochoerus jaegeri.
• The absence of Kolpochoerus in the Turkana Basin during the Pliocene warrants further investigation.