Rough doris (Onchidoris muricata)
|Researched by||Rose Edwards||Refereed by||Admin|
|Authority||(O. F. Müller, 1776)|
|Other common names||-||Synonyms||-|
Onchidoris muricata has a maximum length of 1.4 cm and is usually white in colour but pale yellow individuals have been recorded. Also some rare individuals have been recorded with brown speckling on the mantle. Club-shaped stalked projections (tubercles) are visible on its mantle. Up to 11 gills can also be found at the rear of the mantle. The head is extended to form an oral veil, which lacks tentacles. The eggs are spawned in a ribbon, coiled several times.
Recorded distribution in Britain and IrelandMore common on the west coast of the British Isles particularly in the north. Few recordings on the east coast of the British Isles.
Global distributionThis widespread species has been recorded on both sides of the north Atlantic, and in Alaska, British Columbia and Washington in the north Pacific.
HabitatOnchidoris muricata is found on the lower shore or in sublittoral areas to depths of 15 m.
- Grows up to 1.4 cm.
- White or pale yellow in colour.
- Rounded tubercles with flattened tops.
Likely to be confused with Adalaria proxima, however Onchidoris muricata has club-shaped tubercles whereas Adalaria proxima tentacles are pointed. Also Adalaria proxima is a large species, it can grow to 1.7 cm in length.
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Last Updated: 08/04/2004