Species found washed-up near Hayle, Cornwall, on the plastic collar of a crab / lobster pot. 09.01.14.
The barnacle here is extremely small and juvenile, and likely to be a small juvenile Megatrema anglicum, as this species is commonly found on Devonshire cup coral, Caryophyllia smithii. The cup coral here is a juvenile specimen, juveniles are noted to be quite variable in form. Both species were found on a piece of lobster / crab pot at Sennen Cove, Penwith, Cornwall. 14.11.13.