Halocynthia igaboja

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Sea Hedgehog:
Sea Hedgehog (Halocynthia igaboja): The bristly tunicate is easily recognized by its dense covering of brown "hair" (spines), which isn't limited to the siphons or body. Warty tunicate (Pyura haustor) doesn't have hair on the siphons which are longer and paler, and Halocynthia hilgendorfi, which is sometimes synonymized and appears to be a Western Pacific species, doesn't have hair on its body. It is extremely cryptic, especially when the siphons are closed.

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