Branchial lobes fused dorsally. Radioles numerous, usually more than 8 pairs and increasing with size of worm. Palmate membrane present. Radiolar flange radiolar flange forming expanded rounded flanges at tips of radioles. Paired stylodes absent. Radiolar eyes absent. Anterior margin of peristomial ring unmodified, of low, even height all around. Narrow, about as long as wide. Distal end entire. Posterior peristomial ring collar present. Dorsal lips with dorsal radiolar appendages. Lacking dorsal pinnular appendages.
Glandular girdle on chaetiger 2 absent. Thoracic and abdominal interramal eye spots present. Pygidial eyes absent. Anal depression absent.
Notochaetae of chaetiger 1 comprise a bundle of 2 rows similar to remaining thoracic notochaetae. Superior thoracic notochaetae elongate, narrowly hooded. Inferior thoracic notochaetae, anterior row (chaetiger 4) absent. Inferior thoracic notochaetae, posterior row (chaetiger 4) spinelike. Teeth of thoracic uncini equal in size in series above main fang. Breast well developed, resulting in a Z-shaped avicular appearance. Handle as long or slightly longer than length of neck of uncinus. Thoracic neuropodial companion chaetae present. Abdominal notopodial uncini with a distinct main fang and several smaller teeth above. Breast well developed. Handle long. Abdominal neurochaetae in a spiral (viewed end-on). Anterior abdominal neurochaetae, posterior row absent. Posterior abdominal neurochaetae, anterior row spinelike.
.
