Table 1.

Genera with ventral lamellae: comparisons of some features

Characters	Gastrolepidia Schmarda, 1861	Paralepidonotus Horst, 1915	Branchinotogluma Pettibone, 1985
Subfamily	Arctonoinae sensu Hanley 1989	Polynoinae sensu Read (2006)	Branchinotogluminae sensu Pettibone, (1985); Zhang et al. (2018a b)
	Polynoinae sensu Serpetti et al. (2017); Zhang et al. (2018a)	Lepidonotinae sensu Zhang et al. (2018a)
Number of segments	Up to 60	Up to 40	21
Pairs of elytra	31	15	10
Cephalic peaks	absent	Absent	Absent
Facial tubercle	Well developed	Weakly developed	Absent
Ceratophores of lateral antennae	Inserted termino-ventral, converging mid-ventrally	Inserted termino ventrally merging in ventral midline	Absent, no ceratostyle
Nuchald Fold	Present on second segment	Absent	Absent
Ventral lamellae	Beginning at segment 3	Beginningat fourth segment	2 to 6 pairs of lamellae on segments 13-18
Nephridial papillae	Beginning on segments 6-8	Nephridial papillae from segment 6	1 to 7 pairs on segments 12-15
Neuropodia	Pre-chaetal lobe rounded, not projected as an acicular lobe, similar in length and shape to post-chaetal	Pre-chaetal lobe projected as an acicular lobe, longer than post-chaetal lobe. With or without supra-acicular lobe	Pre-chaetal lobe projected as an acicular lobe, longer than post-chaetal lobe. No supra-acicular lobe

Characters	Phyllohartmania Pettibone 1961	Kristianides gen. nov
Subfamily	Polynoinae sensu Pettibone 1961	Eulagiscinae sensu Pettibone 1997; this study
Number of segments	37	38
Pairs of elytra	15	15
Cephalic peaks	Pointed	Absent
Facial tubercle	Absent	Absent
Ceratophores of lateral antennae	Inserted ventrally, merging in midline	Inserted terminally as extensions of prostomium
Nuchald Fold	Absent	Absent
Ventral lamellae	Ventral lamellae from fourth parapodia	Beginning at segment 3
Nephridial papillae	Begining at segment 3	Not visibles
Neuropodia	Pre-chaetal lobe projected as an acicular lobe, longer than post-chaetal lobe. Supra-acicular lobe	Pre-chaetal lobe projected as an acicular lobe, longer than post-chaetal one. No supra-acicular lobe