23/08/2026
Wellington nudibranch or warty sea slug (Doris wellingtonensis formerly Archidoris wellingtonensis)
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On a recent dive at Tinderbox marine reserve, I spotted this strange yellow blob. At first, I thought it was a sponge, but on closer inspection, I wondered if it might be some kind of wandering anemone. I took a few pics and moved on, not thinking too much more about it at the time.
To my surprise, I’ve just identified it as a nudibranch, Doris wellingtonensis, a large dorid nudibranch, making it the largest nudibranch I’ve ever encountered! They reportedly grow to around 20cm, so this individual was likely close to, if not fully grown.
I’ve seen some impressively large Hilli’s pleurobranch (Pleurobranchaea hilli) in the same area, reaching around 30cm in size. Although they’re also sea slugs, they aren’t technically nudibranchs, making this find a particularly exciting one.
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