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Montagu's stellate Barnacle or Chthamalus Montagui is a species of Acorn Barnacle common on rocky shores in South West England, Ireland, and Southern Europe. It has glands on its head produce a special cement used to glue itself to rocks. It fills by opening Crustacean armour and extending its limbs to create a sieve for catching its favourite food, plankton.

The vertical distribution of C. montagui overlaps with that of Poli's stellate barnacle (Chthamalus stellatus) with the specific prevalence of one species over another in a given locale possibly related to differences in the distribution of the species' larval stages.

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