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| barnacles text index | photo index |
| Phylum Arthropoda > Subphylum Crustacea > Class Cirripedia |
| Acorn
barnacle Balanus sp. Family Balanidae updated Nov 08 Where seen? This 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 |
 Chek Jawa, Apr 07 |
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Acorn barnacles on Singapore shores
 Changi, Aug 05  Acorn barnacles on a living snail. |
 Pulau Sekudu, Feb 07 |
 Changi, Jan 07 |
 Cyrene Reef, Nov 08 |
 West Coast, Jun 02 |
 Pulau Ubin, Dec 09 |
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