Character / Genus	Sthenelais	Fimbriosthenelais	Eusthenelais
Prostomium	Prostomium	Prostomium	Prostomium
Length of lateral antennae	Distinctly shorter than dorsal tentacular cirri	Distinctly shorter than dorsal tentacular cirri	As long as dorsal tentacular cirri
Segment 3	Segment 3	Segment 3	Segment 3
Pair of dorsal cirri	Absent	Absent	Present
Neuropodia	Neuropodia	Neuropodia	Neuropodia
Stylodes	Smooth (occasionally minutely papillated)	Distinctly papillated	Smooth
Shape of posterior bract	Bilobed	Bilobed or truncate	Bilobed
Neurochaetae	Neurochaetae	Neurochaetae	Neurochaetae
Compound falcigers	Present (numerous)	Present (numerous)	Present (numerous)
Compound spinigers	Absent or present (few)	Absent	Present (numerous)
Simple spinous chaetae	Absent or present (few)	Absent or present (few)	Absent