New Species of Scalibregmatidae (Annelida) from Slope and Abyssal Depths off Eastern Australia Author Blake, James A. text Records of the Australian Museum 2023 Rec. Aust. Mus. 2023-05-17 75 3 271 298 http://dx.doi.org/10.3853/j.2201-4349.75.2023.1827 journal article 294418 10.3853/j.2201-4349.75.2023.1827 28884b95-8980-40e8-a89c-f3e540143c0f 2201-4349 10414024

Table 2. Morphological comparison of 17 known species of Oligobregma. Abbreviations: Ant, anterior; Atl, Atlantic; CCZ, Clarion-Clipperton Zone; intPap, interramal papilla; N, north; NeuroC, neuropodial cirri; NotoP, notopodia; NotoC, notopodial cirri; NeuroP, neuropodia; NW, northwest; Pap, papilla; Post, posterior, S, south; SE, southeastern; Set, setiger; W, western.

species	anterior setigers with acicular spines	prostomium	first furcate	segmental annulation patterns	posterior parapodia	pygidium	distribution & references
			setae
species with acicular spines on setigers 1–2
O. aciculata (Hartman, 1965)	Both rami; spines hirsute	2 short rounded frontal	?Set 3	Not reported	NotoC short, rounded; NeuroC,	Unknown	W North Atl, abyssal, 4850 m;
		lobes			triangular, pointed; with		Hartman, 1965
					interramal Pap
O. oculata Kudenov & Blake,	Both rami	T-shaped, with digitiform	Set 3	Set 1 smooth; Set 2	NotoC narrow, as long as wide;	“At least” 2	S of New Caledonia, 57 m;
1978		lateral lobes		biannulate; Set 3	NeuroC digitate, 3 times as long	anal cirri	Kudenov & Blake, 1978
				triannulate; rest with	as wide; large intPap
4 or 5 annulations
O. pseudocollare Schüller &	NotoP only	With 2 laterally directed	Set 3	Set 1–3 smooth; Set 4–9 tri-	Short conical dorsal and ventral	No cirri	Southern Ocean; Scotia and
Hilbig, 2007		rounded lobes		to quadriannulate,	cirri	observed	Weddell Seas, 753–3050 m;
				thereafter with 5			Schüller & Hilbig, 2007
				annulations
species with acicular spines on setigers 1–3
O. aristata sp. nov.	Both rami; spines with	2 short forwardly directed	Set 5–6	Set 1 a single large medial	NotoC large, inflated, with	Unknown	Off Australia lower
	terminal arista	lobes; these notched in		pad; set 2 uniannulate; set	nipple-like tip directed dorally;		continental slope and
		holotype		3–4 triannulate; set 5–10	NeuroC asymmetrical, nipple-		abyssal depths, 2793–4031
				inflated, obscured; set	like tip directed laterally		m; This study
				11–22 tri- to quadriannulate
O. collare (Levenstein, 1975)	NotoP only; spines hirsute	2 short forwardly directed	Set 4	Set 1–2 smooth; set 3 to	NotoC short, bluntly triangular;	Up to 8 cirri	Southern Ocean, Antarctica,
		rounded lobes		mid- body triannulate; post	NeuroC short, conical; with		1622–6070 m; Levenstein,
				set quadriannulate	interramal Pap		1975; Blake, 1981
O. mucronata Blake, 2015	Both rami; spines w/	2 short, forwardly directed	Set 4	Set 1–2 uniannulate; set 3,	NotoC large, triangular, NeuroC	4 anal cirri	East Antarctic Peninsula,
	terminal arista	rounded lobes		biannulate; set 4 and	large, triangular, with broad		323–912 m; Blake, 2015
				following quadriannulate	base; with interramal Pap
O. notiale Blake, 1981	NotoP only	2 enlarged, diverging lateral	Set 4	Set 1 smooth to irregular;	NotoC large inflated lobe;	5 ventral cirri	Southern Ocean, Antarctica,
		lobes		rest quadriannulate	NeuroC small, conical lobe;		18–923 m; Blake, 1981
					with large interramal Pap
O. profunda sp. nov.	Both rami of first row; rarely	2 short rounded lobes,	Set 5–6	Set 1–3 smooth; set 4–end	NotoC and NeuroC erect;	4 anal cirri	Off eastern Australia,
	in second row of set 1;	subapical		tri- to quadriannulate	triangular with pointed tips		Tasmania to New South
	NeuroP of set 1‒2, rarely 3;						Wales, 3881‒4176 m. This
	first row only.						study.