large smooth barnacles are sometimes seen on our rocky shores, on
large boulders where there is more water movement and where they are
shaded from the sun at low tide.
Features: To about 3cm across.
Outer shell thick, smoothly conical and not made up of plates. The
outer shell has a ridged patten of bumps or short lines. The shell
opening is rather small and the operculum recessed. Some were seen
with an operculum with a pointed tip. The thick shell has an air-filled,
honey-comb internal structure. This provides strength as well as insulation
from the heat when exposed at low tide.
Thick shell with
honey-comb internal structure.
Chek Jawa, Apr 02
Sisters Island, Jul 06
Pulau Hantu, Jul 03
Pulau Sekudu, Mar 07
Spot where a Volcano barnacle
used to be?
barnacles on Singapore shores
are difficult to positively identify without examination of internal parts.
On this website, they are grouped by external features for convenience of
- Lim, S.,
P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life
and Times of Labrador Beach. Division of Biology, School of
Science, Nanyang Technological University & Department of Zoology,
the National University of Singapore. 160 pp.