Genus Orbinia Quatrefages 1866

Orbinia Quatrefages 1866: 288; Hartman 1957: 256; Blake 2017: 86; Sun & Li 2018: 352.

Orbinia (Orbinia) Pettibone 1957: 160 .

Diagnosis (after Blake 2017; Sun & Li 2018). Prostomium conical, pointed, peristomium with 1 achaetous ring. Branchiae from chaetiger 5–20. Posterior thoracic chaetigers with postchaetal papillae (2–many) and subpodial papillae (3–many), usually forming ventral encircling fringe of 5 or more papillae. Thoracic neurochaetae including uncini or subuluncini, and crenulated capillaries; neuropodial modified spines absent; forked chaetae and flail chaetae present or absent in abdominal parapodia.