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Larval Shell Muscles in the Abalone Haliotis kamtschatkana.

The Biological Bulletin

|June 6, 2017

Summary

Larval shell muscles in abalone (Haliotis kamtschatkana) were studied using microscopy. New findings challenge previous theories on gastropod evolution by suggesting a misidentification of larval retractor muscles.

Area of Science:

Marine Biology
Developmental Biology
Evolutionary Biology

Background:

Larval shell muscles are crucial for gastropod development and evolution.
Previous studies, notably by Crofts, have influenced theories on gastropod evolution.
The larval retractor muscle (LRM) and accessory larval retractor muscle (ACC) are key structures.

Purpose of the Study:

To investigate the larval shell-attached muscles in Haliotis kamtschatkana.
To re-evaluate Crofts' (1937, 1955) descriptions in light of new data.
To inform theories on gastropod evolutionary developmental biology.

Main Methods:

Light and electron microscopy were employed.
Detailed observation of muscle differentiation and attachment in Haliotis kamtschatkana larvae.

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Comparison of muscle morphology with existing descriptions.

Main Results:

Larval shell muscles in H. kamtschatkana fall into two categories: striated retractor muscles (LRM, ACC) and nonstriated pedal muscles.
The ACC and parts of the LRM degenerate during metamorphosis.
Two distinct pedal muscles develop after ontogenetic torsion.

Conclusions:

The data necessitate a re-evaluation of ancestral larval shell muscle homologies in abalone.
Crofts may have misidentified the ACC, potentially impacting evolutionary interpretations.
This study refines our understanding of gastropod larval muscle development and evolution.