|A burrowed Eunice aphroditois|
Eunice aphroditois is a benthic bristle worm of warm marine waters. It lives mainly in the Atlantic Ocean, but can also be found in the Indo-Pacific. It ranges in length from less than 10 cm (4 in) to 3 m (10 ft). Its iridescent cuticle produces a wide range of colors, from black to purple. This species is an ambush predator; it hunts by burrowing its whole body in soft sediment on the ocean floor and waiting until its antennae detect prey. It then strikes with its sharp mouthparts. It may also be found among coral reefs.
These ambush predators have no eyes and five antennae on their head that are used to sense prey. The body is covered by a hard exoskeleton. The mandibles can be retracted inside the body and are responsible for striking and stunning prey; they are capable of snapping some prey in half. Typically, E. aphroditois ranges from deep purple to black, along with metallic colours. The largest known specimen on record reached 299 centimetres (9.81 ft) in length, making it the longest known member of the polychaete class. Despite these great lengths, the worms are slim, with the body only about 25.5 millimetres (1.00 in) wide.
This species may be found prowling among the prey-rich environment of coral reefs, where its coloration allows it to blend in and its slim body enables it to hunt in tight places. It inhabits a wide range of other habitats, particularly sandy and muddy sediments, as well as around rocks and sponges. It has been recorded at depths of up to 95 meters.
Diet and interactions
E. aphroditois senses passing prey with its antennae, seizes the prey with its mouth, and drags it into its burrow. To reduce predation risk, some fish engage in mobbing behavior, during which a group of fish will direct jets of water into the worm's burrow to disorient it.
Ancestral species may have exhibited the same hunting behavior twenty million years ago, according to fossil records.
Like most of the class Polychaeta, E. aphroditois is a sexually reproducing organism that lacks external reproductive organs. During spawning, female polychaetes produce a pheromone that attracts males and causes them to release sperm; this in turn triggers the female to release eggs into the water, where fertilization occurs. Few offspring survive to adulthood because often, the eggs are eaten by other animals or destroyed.
The lifespan of E. aphroditois is believed to be three to five years.
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