Capitella capitata (Fabricius, 1780)
Thorax with 9 chaetigers.
First 6-7 segments with capillary chaetae only.
Male with 4 genital hooks arranged in a diagonal cross mid-dorsally between chaetigers 8 and 9.
Up to 120 mm for 100 segments.
Alive life red-brown to purple.
In alcohol red-brown to transparent.
From eulittoral down to 1000 m deep. In muddy sand or rich mud and under stones. Often indicates pollutes conditions.
Surface deposit feeder.