Genus Chaetocirratulus Blake, 2018

Chaetocirratulus Blake, 2018: 56 .

Type species

Heterocirrus andersenensis Augener, 1932 . Original designation by Blake (2018).

Diagnosis (after Blake 2018)

Prostomium broadly rounded anteriorly or wedge-shaped; eyespots absent; with a pair of small nuchal organs as slits or depressions at posterior edge. Peristomium with a single pair of grooved dorsal tentacles arising from posterior margin or interface with chaetiger 1. First pair of branchiae arising from posterior margin of peristomium, an achaetous segment, or chaetiger 1. Body typically thick and fusiform over many segments, rarely with middle or posterior body segments beaded or moniliform; individual segments short, numerous. Setae include capillaries on most chaetigers and thick, pointed spines in neuropodium and a few in notopodium or spines in neuropodium only; spines few, often small and inconspicuous, not forming cinctures. Individual spines straight to weakly sigmoid. Pygidium a simple ventral lobe.