Clavelina coerulea
Clavelina coerulea, the blue ringed sea squirt, is a species of tunicates belonging to the family Clavelinidae. The species name refers to the vivid blue body coloration. Members of the class Ascidiacea including this species are hermaphroditic; both cross- and self-fertilization is typical. The eggs of this tunicate develop into lecithotrophic larva before metamorphosing into sessile benthic adults. When disturbed, these tunicates may draw up their apertures, much like a drawstring around the rim of a bag. They are filter feeders, drawing plankton in through their incurrent aperture in a continuous stream of water, using tiny hair-like cilia, and expelling waste through the excurrent aperture.
| Clavelina coerulea | |
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Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Tunicata |
| Class: | Ascidiacea |
| Order: | Aplousobranchia |
| Family: | Clavelinidae |
| Genus: | Clavelina |
| Species: | C. coerulea |
| Binomial name | |
| Clavelina coerulea Oka, 1934 | |
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