adrianashley's picture

Sea Slug

Observed: 27th April 2013 By: adrianashleyadrianashley’s reputation in Invertebratesadrianashley’s reputation in Invertebrates
Nudi 290413
Description:

Seen Sunday on wreck in12.5m of water. Approx 1.5cm long. Other, smaller individuals also present. Had initially identified it as Coryphella Browni, but I’m now thinking Coryphella Gracills Smargdina due to the grey-green colour of the cerata.

Identifications
  •  
    Likely ID
    Sea slug (Coryphella Gracills Smargdina)
    Confidence: It might be this.
Species interactions

No interactions present.

Comments

Jonathan's picture

What a lovely thing! I wish

What a lovely thing! I wish terrestrial slugs were so pretty.

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)

adrianashley's picture

lovely things

Hi Jonathan,
That’s a relatively drab one. Have a look at flabellina pedata and Janolus cristatus (both found in the UK) for some real beauties.

Jonathan's picture

Interesting. So why are

Interesting. So why are marine molluscs so brightly coloured?

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)

adrianashley's picture

No Idea. I’m afraid I’m far

No Idea.
I’m afraid I’m far more of an observer than a theorist. But I can tell you my own colour vision starts to fade under around 3m of water and is all but gone by 20m, so they obviously have very different eyes to us.

Jonathan's picture

Or their predators do,

Or their predators do, perhaps? Terrestrial slugs tend to be distasteful to predators, compared to snails that have a shell to protect them. I wonder if that happens in the sea as well. So many questions!

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)

adrianashley's picture

distasteful to predators

I did a bit of research on this and it turns out that the dangly bits on the slug’s back are part of its gut and the white tips are actually stinging cells that originally belonged the slugs food and are now being re-used by the slug. So no, I don’t think they would taste very nice.

Jonathan's picture

Fascinating! Thanks.

Fascinating! Thanks.

Jonathan
University of Edinburgh and Biodiversity Observatory (OU)