TABLE 1. Comparison between the genera Jasmineira Langerhans, 1880 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation

TABLE 1. Comparison between the genera Jasmineira Langerhans, 1880 and Potamethus Chamberlin, 1919 based mostly on Capa et al. (2019) and references therein cited, but see remarks.
Jasmineira Langerhans, 1880Potamethus Chamberlin, 1919Abscission zone above radiolar basesPresent in some speciesNot reportedInter-radiolar membraneAbsentAbsent or present (this study)Radiolar flangesAbsentAbsentDorsal lipsWith or without radiolar appendages (mid-rib)With radiolar appendages (mid-rib)Ventral sacsAbsentPresentParallel lamellaeAbsentPresentPeristomial vascular loopsPresent in some speciesAbsentAnterior peristomial ringWith a narrow ventral lobeWith a narrow ventral lobeSemi-circular moldures in lateral sides of anterior peristomial ringAbsentPresent in some species (this study)Posterior peristomial ring (collar)Not elongateDistinctly elongateGlandular ridge on chaetiger 2PresentPresent or absent (this study)Ventral glandular shieldsPresent or absent (absent in J. schaudinni: this study)Present or absent (this study)Bayonet chaetae (inferior thoracic notochaeta)PresentAbsentCompanion chaetae (thoracic neuropodial chaetae)AbsentPresentThoracic unciniAcicular with hoods (size of handles was not indicated)Avicular with long sized handles; hood absentAbdominal unciniAvicular with breast reduced to narrow swelling and distinctly elongate neck between breast and main fangAvicular with breast reduced to narrow swelling, distinctly elongate neck between breast and main fang. A small hump on the angle between external margin of neck and handle (this study)Pygidial cirrusAbsent or presentAbsent