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Category Archives: crustacean

Southern pill woodlouse

15 Monday Jun 2026

Posted by sconzani in crustacean

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Tags

Armadillidium depressum, British crustaceans, British woodlice, pill woodlice species, Southern pill woodlouse

Until I was filing away my recent photos of this creature, I’d forgotten that I actually saw one – my first, the one shown below – tootling along amongst the stones and sparse vegetation in King Barrow quarry on the Isle of Portland during my visit last September.

I spotted this second beast on a wall in a local street very recently. And, at around 12mm long (measured by taking a photo of my left index finger right next to it), this crustacean really was a beast, and, according to the Naturespot website, they can grow to 20mm so this one wasn’t even fully grown.

Meet the Southern pill woodlouse (Armadillidium depressum), a creature that curls itself into a ball when threatened and which can be distinguished from your common or garden Pill woodlouse (Armadillidium vulgare) by the way the sections of its armadillo-like outer skin curve up slightly at the ends.

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Goose barnacles

26 Thursday Mar 2026

Posted by sconzani in crustacean

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Tags

beachcombing, Goose barnacle, Lepas anatifera, Weymouth beachcombing

I didn’t spend a lot of time beach fossicking during last week’s visit to Weymouth but, when I was walking along the front towards Lodmoor one morning, I noticed a man kicking at something on the sand. My curiosity got the better of me so, when the man had walked on, I went down for a look. This is what I saw.

It looked like a very strange snake but was, in fact, a piece of thick rope covered in possibly hundreds of Goose barnacles (Lepas anatifera), something I’d never seen before in person but had seen in photos on social media. The Wildlife Trusts website provided the following information:

Barnacles are a type of crustacean, related to crabs and lobsters. Goose barnacles filter feed on plankton and detritus, capturing it from the water with their specially adapted legs. In many places in the world they are a delicacy – in fact, in days gone by, any ships arriving in Cornwall with goose barnacles on the hull were a real moneyspinner. The goose barnacles would be scraped from the hull and sold for food.

These Goose barnacles didn’t look the least bit appetising to me. There was no way to know how long they had been lying on the beach and I wasn’t even sure if they were alive or dead, but it was certainly interesting to finally see these creatures.

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Scabby little pig

20 Tuesday Jan 2026

Posted by sconzani in crustacean

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Tags

British crustaceans, Common rough woodlouse, Porcellio scaber, Rough woodlouse, terrestrial crustacean, woodlouse

As insects are few and far between now that we’re in the middle of winter, when I noticed this woodlouse on a house wall, I took a few photos, thinking anything’s better than nothing (though, of course, a woodlouse is not actually an insect, it’s a terrestrial crustacean). Now I’m very glad I did get some images as this was actually a new species for me – though, as it’s meant to be common, I do wonder whether I’ve seen it before and ignored it. My bad, as they say.

This is a Common rough woodlouse (or just Rough woodlouse). Its scientific name is Porcellio scaber, which roughly translates as rough or scabby little pig, hence the title of this blog. Hopefully you can see the tiny tubercles (a fancy name for bumps) that makes its exoskeleton look rough, hence its name. As well as living in cracks and crevices on walls, fences and trees, it can also be found in the same places you see most woodlice, i.e. in the garden under logs and stones and bark.

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About me

sconzani

sconzani

I'm a writer and photographer; researcher and blogger; birder and nature lover; countryside rambler and city strider; volunteer and biodiversity recorder.

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