Ribbed Top Shell Austrocochlea constricta
The Ribbed Top Shell has a shell which is thick, rounded, and cone shaped with a sharp apex.
The shell height is equal to its width.
The shell aperture is rounded and ridged.
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The colour of the Ribbed Top Shell is a uniform dull grey to off-white.
The Ribbed Top Shell ranges from Coffs Harbour, in northern New South Wales, around southern shores to Albany, southern Western Australia.
It is abundant at mid tide levels on exposed rock surfaces on medium to low-energy coasts. This very common mollusc is found in a variety of habitats.
The Ribbed Top Shell feeds by scraping algae from the rock surface. It leaves distinctive trails in loose sand in rock pools.
For many years this Top Shell was clumped together with the Zebra Top Shell, A. porcata, which is more common along the New South Wales coast. Recently, the two forms have been considered to be separate species.
The Ribbed Top Shell is eaten by the predatory molluscs, the Cart Rut Shell, Dicathais orbita and the Wine-mouthed Lepsiella, Lepsiella vinosa, a southern species.
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