Sagitella Wagner, 1872

Type species: Sagitella kowalewskii Wagner, 1872

Diagnosis (emended). Body short, fusiform. Prostomium with terminal palpodium, ciliary belts absent. Caruncle absent or poorly pronounced. Nuchal organs not encompassing the caruncle, as two semicircular ridges on posterior part of prostomium. First three segments lack parapodia and bear three pairs of lamellar cirri enfolding head. Each chaetiger of body trunk with large lamellar dorsal and ventral cirrus and poorly marked podial lobe. Parapodia uniramous, acicular, with two simple stout chaetae and one thick protruding aciculum. Pygidium with two flattened appendages.