Crypsis
Loimia medusa’s primary defensive mechanism relies on crypsis. With relatively slow locomotory abilities, spaghetti-worms rarely find themselves out in the open. Taking shelter in marine ecosystems containing coral, or simply rocks and boulders, it constructs a tube from sand and gravel, before using a mucus-like secretion in order to cement the tube together. The mucus is secreted from a collar-shaped gland just below the tentacles (E. Kaplan, 1999). The worms segmented body hides within this tube, or simply under a rock or the seafloor itself, and only the long spaghetti-like tentacles of the organism extend into open water in order to gather food. Safe from predators, this species can spread out its tentacles over a substrate for several feet in search of food particles, which can then be carried to the mouth by way of a ciliated groove. With each tentacle acting independently, Loimia medusa can retract a single or group of tentacles when in danger.
source: http://www.marinelifephotography.com/marine/worms/Loimia-medusa-2.jpg
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