Had to pose it's claws as it prefers to tuck them under it.
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Thats an impressive spider crab. I have only encountered a small no of these. I researched whatv Marlin has on them and I ended up slightly confused:
Maja brachydactyla was until recently considered to be conspecific with Maja squinado. Maja squinado has a Mediterranean distribution, while Maja brachydactyla is found in the northeast Atlantic Ocean from Morrocco to Scotland.
This is taken from here:
You could be forgiven for thinking maja squinado doesnt occur in the waters around Britain and Ireland at all after reading this!?
These 2 species must very very similar if they were considered conspecific.
I posted a dead one recently under M. brachydactyla following reading what Marlin said on the 2 species, my pic isnt very good for IDing to be honest, you can only really appreciate that it is a large dead spider crab.
Lat/Lng: 51.5607, -4.3092
OS grid ref: SS400871