Anatomical network analyses reveal evolutionary integration and modularity in the lizards skull.

Area of Science:

• Evolutionary biology
• Comparative anatomy
• Morphological diversity

Background:

• Lizard skull morphology is highly diverse, driven by evolutionary factors.
• Cranial bone interactions reveal integration and modularity, key to understanding skull evolution.
• Analyzing these factors is crucial for understanding lizard adaptation and diversification.

Purpose of the Study:

• To investigate the integration and modularity of lizard and tuatara skulls.
• To explore factors contributing to lizard morphological diversity through comparative analysis.
• To understand how skull structure influences lizard evolutionary success.

Main Methods:

• Utilized Anatomical Network Analysis (AnNA) for skull integration and modularity analysis.
• Compared modular skull structures between lizards and the outgroup tuatara.
• Examined the role of the postorbital bar in skull integration and function.

Main Results:

• Lizard skulls exhibit high integration and generally consistent modular patterns, with some variations.
• The tuatara displays a distinct modular skull pattern compared to lizards.
• The postorbital bar's presence correlates with lower integration, reflecting functional adaptations.

Conclusions:

• Basic skull structures are maintained by functional requirements, while modular integration changes drive diversity.
• Differences in modularity between lizards and tuatara highlight distinct evolutionary pathways.
• Skull integration and modularity are significant factors in lizard morphological diversity and evolutionary prosperity.