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| Domain |
Eukarya |
| Kingdom |
Animalia |
| Phylum |
Arthropoda |
| Class |
Cirripedia |
| Order |
Thoracica |
| Family |
Chthamalidae |
| Genus |
Chthamalus |
| Species |
dalli |
| Common Name: |
small northern barnacle |
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Chthamalus dalli in the Intertidal zone at Race Rocks
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Physical description:
-Size: Reaches a diameter of only 8 mm (0.3 inches)
Colour: Gray, brown
Shape: It looks like a big brown barnacle but the main the difference is the size - it is much smaller
Texture: They do not have ridges
Geographical range: Alaska to San Diego
Habitat: Intertidal and splash zones but also it can occasionally be seen at lower levels
Feeding: Filter feeders on microplankton
Predators: Predatory snails including Nucella ostrina and sea stars such as Leptasterias. If predators are prevalent, Chthamalus dalli will sometimes grow a slight curve on its shell to protect itself.
Reproduction: They are hermaphroditic and produce sperm and eggs simultaneously. They do not self-fertilize, instead they use their long penis (4.5 cm from the shell) to fertilize another barnacle. Life span: About 3 years
Behaviour: It may spend more than half of its life out of the water because it can live in high intertidal levels
References:
http://zipcodezoo.com/Animals/B/Balanus_glandula/
http://beachwatchers.wsu.edu/ezidweb/animals/Chthamalus.htm
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This file is provided as part of a collaborative effort by the students, faculty, staff and volunteers of
Lester B. Pearson College |
April 2011
Alessandra Bustamante Concha-Fernández, Peru PC yr 37
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