gruesome animals are often seen growing in flower
crabs (Portunus pelagicus). Infected crabs are usually
encrusted with non-parasitic barnacles and other animals and seaweeds.
They usually move weakly and are generally in poor shape.
Features: This barnacle grows
through the body of the host crab like a root system. The parasite
does not kill the crab but it does affect the crab's reproductive
system such that the crab becomes infertile.
The parasitic barnacle
eventually produces tiny egg sacs (0.5cm or less) that emerge through
the crab's joints.
Changi, Apr 05
Chek Jawa, Oct 08
Tiny egg sacs emerging through the joints.
are difficult to positively identify without examination of internal parts.
On this website, they are grouped by external features for convenience of
barnacles on Singapore shores
- 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.