Hatschek, 1880
Description:
Body elongate, thread-like, multisegmented; with neither parapodia nor chaetae. With two anterior, mobile, flexible tentacles ('palps') arising from the prostomium with their bases distinctly separated; internal canal of palps connected behind the brain. Pygidium usually with two adhesive lobes. Two eyes, at least in larvae, and usually two so-called statocysts; two nuchal organs. Gliding locomotion by a ventral ciliary band. Pharynx prominent, ventral, with tongue-like organ and grating plate. Salivary glands distinct, extending into a variable number of anterior segments.
The following species of this genus occur in the region:
Protodrilus adhaerens
Protodrilus affinis
Protodrilus brevis
Protodrilus ciliatus
Protodrilus gracilis
Protodrilus hatscheki
Protodrilus helgolandicus
Protodrilus hypoleucus
Protodrilus oculifer
Protodrilus purpureus
Protodrilus robustus
Protodrilus rubropharyngeus