Darwin's barnacle, Austrominius modestus


Short description of Austrominius modestus, Darwin's barnacle

A small sessile barnacle, five -10 mm in diameter, characterised by having four shell plates.  Low, conical body shape with a diamond shaped opening.  Young specimens are white and smooth; adults are grayish brown and usually eroded. 

Description of Austrominius modestus, Darwin's barnacle status in GB

This barnacle is distributed around most coasts of England and Wales, a few areas of Scotland and some Scottish islands including the Outer Hebrides.  

Habitat summary: Austrominius modestus, Darwin's barnacle

Can inhabit almost the entire intertidal zone, but is most common from mid-shore to shallow subtidal areas of estuarine and sheltered marine habitats.   It attaches to a variety of substrates including rocks, stones, hard-shelled animals and artificial structures including ships, and tolerates a wide range of temperature and salinity.

Overview table

Environment: Marine
Species status: Non-Native
Native range: Australasia
Functional type: Filter-feeder
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: Chichester Harbour
Date of first record: 1945

Distribution map

GB Distribution from NBN Atlas

Author's name:

Natalie Sweet

Last updated:

January 6th, 2012

We try to keep these factsheets up to date, however if you notice any issues please contact us

[You must enable JavaScript to see this email address]

Thin strip of image show tree trunk and bark