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Related Experiment Video

Updated: Jan 30, 2026

Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit

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Published on: September 2, 2025

Morphological evolution and modularity of the caecilian skull.

Carla Bardua^1,2, Mark Wilkinson³, David J Gower³

¹Department of Life Sciences, Natural History Museum, London, UK. c.bardua@nhm.ac.uk.

BMC Evolutionary Biology

|January 24, 2019

Summary

Caecilian cranial evolution reveals significant modularity shaped by evolutionary history, body size, and lifestyle. Despite complex integration, no direct link exists between cranial module integration and evolutionary rate or disparity.

Keywords:

Amphibia Caecilians Cranial Evolution Evolutionary rate Gymnophiona Integration Macroevolution Modularity Skulls

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Last Updated: Jan 30, 2026

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Area of Science:

Evolutionary biology
Comparative anatomy
Amphibian research

Background:

Caecilians (Gymnophiona) represent an ancient amphibian lineage with diverse skull morphologies.
Quantifying caecilian cranial variation is challenging due to complex structures and evolutionary history.
Understanding cranial modularity is key to deciphering evolutionary patterns in this group.

Purpose of the Study:

To quantify cranial morphological variation across all extant caecilian genera.
To assess cranial modularity and its evolutionary influences (phylogenetic, allometric, ecological).
To investigate the relationship between cranial module integration, evolutionary rate, and disparity.

Main Methods:

Utilized an intensive surface geometric morphometric approach.
Defined 16 cranial regions using 53 landmarks and over 1400 semilandmarks.
Analyzed high-dimensional cranial data for shape, modularity, and evolutionary factors.

Main Results:

Identified a ten-module cranial model with greater posterior skull integration.
Phylogenetic and allometric signals were significant, varying across modules.
Reproductive strategy and fossoriality showed minor but significant effects on cranial morphology.

Conclusions:

Caecilian crania are highly modular, with modules influenced by distinct evolutionary pressures.
Cranial module integration does not correlate simply with evolutionary rate or disparity.
This study provides robust characterization of caecilian cranial evolution and modularity.