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Related Experiment Video

Updated: Jul 16, 2026

In Vivo Modeling of the Morbid Human Genome using Danio rerio

In Vivo Modeling of the Morbid Human Genome using Danio rerio

Published on: August 24, 2013

Shell composition has no net impact on large-scale evolutionary patterns in mollusks.

Susan M Kidwell¹

¹Department of Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA. skidwell@uchicago.edu

Science (New York, N.Y.)

|February 12, 2005

Summary

Fossil records may not be heavily biased by shell composition. Marine bivalve genus duration shows little relationship with shell composition, suggesting preservability has a weak impact on fossil patterns.

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Area of Science:

Paleontology
Marine Biology
Geochemistry

Background:

The fossil record is crucial for understanding evolutionary history.
Preservability of skeletal remains can introduce bias, particularly in shell composition.
Marine bivalves have undergone significant shell composition changes over 500 million years.

Purpose of the Study:

To investigate the relationship between shell composition and genus duration in marine bivalves.
To assess the potential bias in the fossil record due to shell preservability.
To determine if shell composition influences the perceived evolutionary patterns of marine bivalves.

Main Methods:

Analysis of fossil records of marine bivalves.
Correlation studies between genus duration and shell composition data.
Evaluation of shell reactivity and its impact on fossilization.

Main Results:

Few significant relationships were found between marine bivalve genus duration and shell composition.
Observed relationships were largely contrary to the expected bias from preferential loss of reactive shell types.
Preservability bias appears weak or randomly distributed in the marine bivalve fossil record.

Conclusions:

The fossil record of marine bivalves is likely not significantly distorted by shell composition-related preservability bias.
Observed temporal patterns in marine bivalves probably reflect genuine biological signals.
This finding supports the reliability of fossil data for studying evolutionary trends in shelled organisms.