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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

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Published on: August 22, 2022

Hypercanines: Not just for sabertooths.

Lars Werdelin¹

¹Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.

Anatomical Record (Hoboken, N.J. : 2007)

|May 31, 2024

Summary

This summary is machine-generated.

Hypercanines, or enlarged canine teeth, evolved for specific functions in mammals and their ancestors. This study reviews their occurrence, growth, and diverse roles, noting unique adaptations in sabertooth felids and mobile hypercanines in ruminants.

Keywords:

Synapsida function hypercanine mammalia sabertooth

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Area of Science:

Paleontology
Evolutionary Biology
Comparative Anatomy

Background:

Hypercanines are defined as hypertrophied caniniform teeth, elongated for specialized functions in mammals and their synapsid ancestors.
Understanding the evolution and function of these specialized teeth provides insights into mammalian adaptation and diversification.

Purpose of the Study:

To provide an overview of the occurrence, growth, and function of hypercanines across a wide range of mammalian and synapsid clades.
To highlight unique evolutionary pathways and convergent adaptations related to hypercanines.

Main Methods:

Literature review and comparative analysis of fossil and extant taxa exhibiting hypertrophied canine teeth.
Examination of functional morphology and growth patterns associated with hypercanines.

Main Results:

Hypercanines are observed across diverse mammalian clades and their synapsid ancestors, serving various functions.
Sabertooth felids and related taxa display unique determinate growth of hypercanines, a trait possibly shared by some Dinocerata.
In herbivores, hypercanines commonly function in sexual display and male-male competition.
Convergent evolution has led to mobile hypercanines within the sockets of three distinct small ruminant clades.

Conclusions:

Hypercanines represent a significant evolutionary adaptation with diverse functional and developmental strategies across the synapsid lineage.
The convergent evolution of mobile hypercanines in ruminants warrants further investigation into the underlying genetic and developmental mechanisms.
The study underscores the varied roles of dental morphology in mammalian evolution, from predation to social signaling.