New Zealand Screw Shell

Maoricolpus roseus (Quoy & Gaimard, 1834)

Large brown screw shell with a pointed tip. It was introduced from NZ to Tasmania about 80 years ago with live shipments of oysters and now occurs in massive aggregations. The species now poses a threat to local species, because living and dead shells have carpeted the seabed in places such the D’Entrecasteaux Channel, greatly altering the habitat. The numbers of the native screw shell Gazameda gunnii seem to decline following the arrival of Maoricolpus roseus in an area. Gazameda gunnii is smaller, with a more mottled appearance, and has fine beads forming ridges around the shell

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What habitats does Maoricolpus roseus live in?

Lives on fine silts, muds, and sandy, gravelly or shelly substrates from the low intertidal down to about 200 m

What is the distribution of Maoricolpus roseus?

In Australia from SA to NSW including Tasmania this species is introduced and is native to New Zealand

How big does Maoricolpus roseus grow?

Can grow up to around 90mm

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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 as a result 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 reference's or bibliography I welcome any feedback and comments on the information provided.

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