The wellington nudibranch is the largest nudibranch found in New Zealand. It is covered in round pustules, and is stiff and slimy to touch. It ranges in colour from yellow green to pale purple. Unlike other nudibranchs it's gills cannot be retracted. It lays large spawn masses that look like thin yellow roses. Wellington nudibranchs are very commonly found at the entrance area of the Oatgo harbour.
May grow up to 30cm, but a length of 10cm is more common for adults.
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