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Related Experiment Video

Updated: May 6, 2026

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

Published on: March 15, 2016

Mollusc evolution: seven shells on the sea shore.

Maximilian J Telford¹

¹Department of Genetics, Evolution and Environment, University College London, Gower Street, London WC1E 6BT, UK.

Current Biology : CB

|November 9, 2013

Summary

This summary is machine-generated.

Recent studies link the shelled Polyplacophora and shell-less Aplacophora. Larval muscle rows suggest adult Aplacophora may have lost shell rows found in Polyplacophora.

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Area of Science:

* Molluscan evolutionary biology and comparative anatomy.

Background:

* Phylogenetic analyses are revealing unexpected relationships between diverse mollusc groups.
* The Polyplacophora (chitons) possess multiple shell plates, while Aplacophora are shell-less marine worms.

Purpose of the Study:

* To investigate the evolutionary connection between Polyplacophora and Aplacophora.
* To explore potential shared ancestral traits despite divergent adult morphologies.

Main Methods:

* Comparative analysis of larval development in Polyplacophora and Aplacophora.
* Examination of muscle row development and arrangement in early life stages.

Main Results:

* Larvae from both Polyplacophora and Aplacophora classes exhibit seven distinct muscle rows.
* This shared characteristic suggests a commonality in their developmental plan.

Conclusions:

* The presence of seven muscle rows in larvae supports the recent phylogenetic unification of these classes.
* It is hypothesized that the shell-less state in adult Aplacophora is a derived trait, involving the loss of polyplacophoran-like shell rows during evolution.