small rather pointy barnacle is commonly seen on many of our rocky
shores and other hard surfaces in the sea such as jetty pilings, sea
walls. Usually, many are crowded together in lower portions and shaded
crevices where it is wetter. Unlike the hardier star
barnacles (Euraphia sp.) which are found higher up where
it is drier.
Features: To about 1 cm across,
conical outer shell made up of several wall plates. While
many settle on walls and hard surfaces,
some species of acorn barnacles settle on living crabs. Some may also
settle on living snails such as the Olive
whelk (Nassarius olivaceus). One snail may have more than
one of these barnacles on its shell, which are quite large compared
to the shell!
On a rock.
Chek Jawa, Jan 05
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.