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Updated: Jun 4, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Evolution: Morphological complexity fuels rapid species turnover.

Kenneth De Baets¹

¹Institute of Evolutionary Biology, Faculty of Biology, University of Warsaw, ul. Żwirki i Wigury 101, 02-089 Warsaw, Poland.

Current Biology : CB

|December 17, 2024

Summary

This summary is machine-generated.

Some animal groups evolve faster than others, but the reasons are unclear. A new study reveals that ammonoids with complex shell decorations had higher rates of species evolution.

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Area of Science:

Paleontology
Evolutionary Biology
Marine Biology

Background:

Certain animal lineages, like mammals and trilobites, exhibit exceptionally high evolutionary rates, characterized by frequent species origination and extinction.
The underlying factors contributing to these elevated evolutionary rates in specific lineages remain largely unknown.
Understanding these factors is crucial for comprehending macroevolutionary patterns.

Purpose of the Study:

To investigate the relationship between morphological complexity and evolutionary rates in fossil ammonoid cephalopods.
To determine if specific traits, such as shell ornamentation, correlate with higher rates of speciation and extinction.

Main Methods:

Analysis of fossil ammonoid specimens, focusing on shell morphology and ornamentation.
Phylogenetic analysis to reconstruct evolutionary history.
Statistical modeling to correlate shell complexity with estimated rates of species origination and extinction.

Main Results:

A significant positive correlation was found between the complexity of shell ornamentation and evolutionary rates in ammonoids.
Ammonoid species with more elaborate shell structures displayed higher rates of both species origination and extinction.
This suggests that morphological innovation may drive evolutionary tempo.

Conclusions:

Shell ornamentation complexity is a significant predictor of evolutionary rates in ammonoid cephalopods.
Morphological complexity, as exemplified by shell ornaments, may play a key role in driving diversification and extinction dynamics in certain lineages.
These findings offer insights into the factors that promote high evolutionary rates in distinct animal groups.