Leddormer: Syllidae. Leddormer: Amphicteis gunneri.
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Syllids are small annelids distinguished from other groups by the presence of the proventricle, a barrel-like muscular region in the anterior end of the animals, visible through the relatively translucent skin. They are one of the most common and diverse groups of annelids in marine benthic environments. 

Syllidae Grube, 1850
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