Sea Lemon
Doris pseudoargus
Sighting evidence at Cathedral Rock, St. Abbs Head
The sea lemon is one of the largest British nudibranchs and a regular sighting at Cathedral Rock from April through September, its warty yellow-green body blending remarkably well with coralline algae despite reaching 12 cm length. It feeds exclusively on sponges, particularly the breadcrumb sponge common on the arch walls. Egg spirals laid on rock faces are a reliable indicator of recent adult activity even when the animal itself has moved on.
Evidence at this site
No confirmed records on file at this site
Sea Lemon is listed as a curated species here based on historical reports.