Marine Life › Shellfish
A recent study by Taylor, Glover and Williams (2026) found that specimens previously identified as Laternula recta and Laternula marilina in Australia belong to Laternula gracilis.
However, the distinction between L. gracilis and Laternula tasmanica remains unresolved. This is particularly relevant when identifying specimens from Tasmania, where both names have been used historically
Like other bivalves, it feeds by filtering tiny food particles from the surrounding seawater through specialised tubes known as siphons
Although the animal generally remains hidden beneath the sediment, its delicate shells may occasionally be found washed ashore or exposed during low tide
At a glance
Laternula gracilis has a thin, delicate shell that is elongated and oval in shape, with broadly rounded ends. The two halves of the shell are similar in size and shape, and it generally grows to around 50 mm in length.
The outer surface is whitish to pale cream, sometimes covered by a thin, transparent to light brown outer layer. Fine, rounded growth ridges run across the shell, following its outline, and become more noticeable towards the rear. Under magnification, the surface has a finely grainy appearance, with tiny, short, bristle-like projections.
The raised hinge area, known as the umbo, is low and positioned near the middle of the upper edge. Unlike some related species, the shell lacks a prominent pointed extension at either end.
The inside of the shell is smooth and pearly, with a small, spoon-shaped structure beneath the hinge that supports the internal ligament.
The combination of its elongated oval shape, delicate shell, fine growth ridges and pearly interior provides useful features for identification. However, examination of the internal shell structures may be needed to distinguish it from closely related species.
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Distribution provided by The Atlas of Living Australia
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Disclaimer: A lot of work goes into trying to identify and ensure accurate identifications are made, and that the listed Descriptions, Sizes, Habitats and Distribution information is as accurate and valid as possible. Unfortunately, information in this arena is ever changing and as such no guarantee can be offered that it is correct or currently valid — the information is provided as a guide, and it is always suggested that you do a little research to ensure you have the latest and most accurate information. View the references or bibliography. Feedback and comments on the information provided are always welcome.
From Our Tasmania · https://ourtasmania.au/species-guide/view-species/laternula-laternula-gracilis/