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Biology/Natural History: In California, colonies of this species can grow to 7 cm diameter in 3 months. The larvae are brooded in the atrial cavity in spring and summer.

The symbiotic copepod Arthurhumesia canadensis may be present inside the zooids. The amphipod Polycheria osborni is also a rare symbiont. The nudibranch Hermissenda crassicornis often feeds on the zooids.


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© Rosario Beach Marine Laboratory

Source: Invertebrates of the Salish Sea

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