Appearance
This solitary ascidian is sometimes referred to as the "red-throated ascidian", as its two siphons are a vivid red in colour. However, most solitary ascidians that are encountered are so covered in algae that the coloration is often not visible. When found at depth the red colourations may also not be visible, as lower frequencies of light are absorbed by the layers of water above.
Habitat
Like all ascidians, "H. momus" is a sessile filter feeder. It is commonly found attached to rocks from depths of 3–50 metres.References:
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