Columbus crabs wash up in Sussex

09 February 2016 | Posted in Graeme Lyons , Marine
Columbus crabs wash up in Sussex
Columbus crab on goose barnacles / Graeme Lyons

By Graeme Lyons

Senior Ecologist

A few weeks ago I'd never heard of Columbus crabs Planes minutus but then Steve Trewhella started posting pictures of them he had found in goose barnacles and other flotsam on beaches in Dorset. After a walk along Brighton Beach on Sunday, I did indeed find several common goose barnacles Lepas anatiferabut not the kind of large fresh clumps I had seen in Steve's images. So, yesterday while looking at the wind direction and ferocity of Storm Imogen, I thought it would be worth a look this morning on Brighton Beach. So Olle Akesson, Michael Blencowe and I met in a miserable car park by the Marina. It was pouring down and very cold and I was wondering what I was doing there. As I said though, "fortune favours the bold."

Ten minutes later we found a big patch of common goose barnacles right by the Marina and there, sticking up for all to see, was a tiny claw! There it was, the first known record of this incredible species for Sussex!

We walked along and found several more patches of goose barnacle and then we stumbled upon a partially buried patch on a buoy that yielded another four individuals, this time showing how varied they can be. Here is Little Red, Little Blue, Christopher Columbus's Ghost and Weetabix-head. Who is your favourite?

My favourite response on facebook to this image was: "It's an itteh bitteh crustacean commiteh."

And here is their habitat!

So what is a Columbus crab? It, like the goose barnacles, is an entirely pelagic animal (yes, they are both crustaceans). The barnacle attaches itself to flotsam (trees, boats, floating plastic bottles!) and the crab lives among the barnacles. It can also live on turtles and in bits of floating rubbish (a number turned up recently in an old rope). So these little guys may well have come all the way across the Atlantic! What a life! I thought the name would come from this very behaviour but it seems that it is actually named after Christopher Columbus who could well have been the first to see this animal! This is likely to be the first record for Sussex and could be the furthest east in the UK but I reckon if you went out looking for them, you could find them even further east than this! How long until they reach Rye Harbour and Dungeness?

Comments

  • Rosalind Collier:

    25 Feb 2016 13:11:02

    Surely Columbus couldn’t have been the first human to have seen them in America. There were plenty of people already there.

  • Ian Taylor:

    25 Feb 2016 13:39:55

    Great article and pictures Graeme. I will have a look on our beach in W Sussex (Middleton-on-Sea)
    As they were “washed up” I wonder what they will do next? Will they enter the sea to find a new pelagic habitat or do they colonise the shore?

  • Gavin Burke:

    25 Feb 2016 18:01:14

    Well said Rosalind! As we know us westerners were pretty good at putting flags in things and saying we found/owned them!

  • Bea Davies:

    28 Feb 2016 14:14:01

    Rosalind and Gavin, If you read the article it doesn’t say Christopher Columbus could have been the first human to see the crabs. You could equally think that Graeme meant the first European instead of the first human. Aside from that ….

    Thanks to Graeme for sharing the sighting and photos with us, both crustaceans are interesting species and something many of us would not ordinarily get to see or even realise what they are if we did.

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