A Sea lemon (Doris pseudoargus), one of the larger nudibranch species we find on irish shores. This one was waiting under a rock for the tide to return.
County Clare, Ireland.

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@Cormac_McGinley Thanks for introducing me to the Sea Lemon 🌊 🍋
I was interested to read that it mostly eats breadcrumb sponge 🍞 🧽
& has recently spread from Europe to North America https://invasions.si.edu/nemesis/species_summary/-1138

#nudibranch #SeaLife

@AquaClaire Thanks for the info - very interesting.