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| barnacles text index | photo index |
| Phylum Arthropoda > Subphylum Crustacea > Class Cirripedia |
| Volcano
barnacle Tetraclita sp.* Family Balanidae updated Mar 2020 Where seen? These 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. |
 Pulau Sekudu, Mar 07 |
 Operculum with pointed tip. |
 Thick shell with air-filled, 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? |
*Species are difficult to positively identify without examination of internal parts.
On this website, they are grouped by external features for convenience of display.
| Volcano barnacles on Singapore shores |
On wildsingapore
flickr
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| Other sightings on Singapore shores |
 'Feet' of the barnacle. Changi West, Sep 20 Photo shared by Vincent Choo on facebook. |
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