Shell up to 5 cm long and 2.5 cm in breadth with sharply pointed apex and 8 tumid whorls. Siphonal canal short, open in juveniles but closed by a flat growth of shelly material in mature shells. Outer lip thin and crenulate in juveniles, thick and coarsely denticulate in older specimens. Ridges across whorls (costae) well spaced, 7-8 on last whorl. Aperture oval. Last whorl with 8-9 spiral ridges. Shell yellowish or white in colour, often with brown markings, especially on costae and spiral ridges. Flesh yellow or cream with white markings. Distinct egg capsules are a flattened vase shape and layed in clumps on stones or shells.In populations subject to high tributyltin (TBT) pollution, female Ocenebra erinacea exhibit a characteristic malformation of the oviduct as an effect of advanced imposex.
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