Haplosyllis agelas is a species of polychaete worm in the family Syllidae, found in the Bahamas. Its host is the demosponge Agelas dispar, of which the species epithet is named after.
Description H. agelas is orange-yellow in colour and grows to about 1 to 2 cm in length, with a width of 0.6 to 1 mm. It has four small, lentigerous, red eyes and large palps.
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