Reconstructing the evolutionary history of the Lorisidae using morphological, molecular, and geological data

Area of Science:

• Primate evolutionary biology
• Molecular systematics
• Primate morphology

Background:

• Lorisid phylogeny and systematics have remained largely unresolved despite numerous studies.
• Previous research utilized diverse data but failed to establish definitive evolutionary relationships.
• This study addresses the need for a comprehensive phylogenetic analysis of all four lorisid genera.

Purpose of the Study:

• To investigate the evolution of the Lorisidae family using combined molecular and morphological data.
• To resolve phylogenetic uncertainties within the genera Arctocebus, Loris, Nycticebus, and Perodicticus.
• To provide taxonomic recommendations based on robust evolutionary insights.

Main Methods:

• Analysis of molecular data (12S rRNA, 16S rRNA sequences) and morphological data (36 craniodental characters).
• Phylogenetic analyses conducted using maximum parsimony and maximum likelihood methods.
• Inclusion and variation of outgroup taxa (galagids and a lemuroid) to test phylogenetic robustness.

Main Results:

• Morphological and initial molecular analyses suggested paraphyletic Lorisidae.
• Exclusion of the lemuroid outgroup resulted in a monophyletic Lorisidae with distinct Asian and African subclades (bootstrap values >90%).
• Estimated genetic distances provided insights into relative divergence times and a potential land bridge explaining lorisid distribution.

Conclusions:

• The study establishes Lorisidae as a monophyletic family, clarifying its evolutionary history.
• Findings support the recognition of distinct Asian and African lorisid clades.
• Results provide a foundation for revised lorisid taxonomy and understanding their biogeography.