Cirratulidae Ryckholt, 1851

Freitas, Roberta, Ribeiro, Rannyele Passos & Ruta, Christine, 2022, Kirkegaardia Blake, 2016 (Annelida: Cirratulidae) from Southeastern Brazil with description of nine new species, PLoS ONE (e 0265336) 2016 (5), pp. 1-27 : 4

Family Cirratulidae Ryckholt, 1851 .

Diagnosis. Body elongated, cylindrical, region anterior and/or posterior segments sometimes expanded. Thoracic region often expanded, abdominal region narrow or moniliform, sometimes expanded in the pre-pygidial region. Prostomium narrow and conical or wide, without appendages, with or without eyes. Peristomium achaetous, with or without rings. One or more pairs of tentacles located on the segmental groove that separates the peristomium from the first setiger or on the thoracic setigers. Dorsal tentacles grooved arise as single pairs or as multiple groups of filaments and cylindrical branchiae. Branchiae long, inserted dorsally at the base of the notopodium, usually present up to the abdominal region. Pharynx ventral, unarmed. Parapodia reduced, bi-ramous, with rudimentary lobes. Many epidermal simple chaetae, such as capillaries, simple hooks, bidentate or multidentate. Pygidium with a simple lobe, sometimes with sub-anal disk, or terminal cirrus [ 2, 32].