TABLE 2 in Unveiling a hidden wanderer in the NE Atlantic: a new species of Scalibregma (Annelida, Scalibregmatidae)

TABLE 2. Morphological characters (based on Blake 2025) for all valid species in Scalibregma with branchiate segment from 3 to 5 and S. celticum (4 pairs of branchiae). “?” indicates uncertain information. Abbreviations: aLmo, anterior lobe of mouth; ant, anterior(ly); dors, dorsal(ly); elong, elongate; gls, glands; int, internal; lat, lateral(ly); perist, peristomium; pigm, pigment(ed); pLmo, posterior lobe of mouth; post, posterior(ly); prost, prostomium; ch(s), chaetiger(s); seg(s), segment(s); ventr, ventral(ly). Present study observations indicated with “*”. S. stenocerumS. hanseniS. lanaiS. drouali sp. nov.S. celticumProstomiumNarrow ant end; horns close projected antT-shaped; horns projected latT-shaped; horns projected ca. 45 degreesT-shaped; horns projected lat or ant-latT-shape; horns projected lat or ant-latEyes2 eyes, each V-shapedEyes absent2 eyes, as patches2 eyes, each V-shaped2 eyes, each VshapedFrontal hornsElong, slender; longer than prost length*Elong, slender; about as long as prost length*Elong, slender; about as long as prost length*Elong, slender; about as long as prost length*Elong, slender; slightly longer than prost length*PeristomiumSmooth, 2 rings apparent dors and ventr; ventr encompassing mouthWith 2 dors rings, partially covering post prostWith 2 dors rings, partially covering post prostWith 2 multilobed dors rings encircling prost, covering eyes and post prost; ventr bordering mouthWith 2 multilobed dors rings encircling prost, covering eyes and post prost; ventr bordering mouthOral morphologyNot described; Fig. 6 of Bertelsen and Weston (1980) show mouth with vertical slit bordered lat by peristMouth ventr, oval with broad ant and post lipsMouth a short transversal slit; with aLmo post to first perist ring as row of 6–8 short lobes; pLmo with 1 row short lobes attached to large ant lobed padaLmo formed by a paired triangular lobes with very small central pad; pLmo formed by a central plicated pad with about 6 lobesMouth a short transversal slit between perist and ch 1; aLmo with long medial fold; pLmo with long lobes on venter of ch 1Segmental annulations4 annuli in Figs 2B, C of Bertelsen and Weston (1980)Ant chs with 4 annuli; following with 5–6 annuliCh 1–2 with 3 annuli, then 4 annuli with some 5 annuli far postCh 1 with 3 annuli, following 4 annuli; post 5 annuli; last 3 annuliCh 1 with 3 annuli, following 4 annuli; far post 5 annuliBranchiaChs 3 to 5, dense; pinnate, each pinna with additional bifurcationsChs 3 to 5, simple; few branchesChs 3 to 5, dense;Chs 3 to 5, dense; pinnate, each pinna with additional bifurcationsChs 2 to 5, dense; arborescentBranchia size?1<2<31~2<31~2<31<<2,3,4Dorsal/ventral cirriMiddle and post cirri inflated becoming elongate in far post ch; int gls not reportedShort triangular from ch 13–14, then elongate, lanceolate post; with int yellow glsSmall, rounded from ch 14–15, then longer and digitiform post; with pigm int glsSmall, subtriangular to blunt from ch16– 17; both quickly gets full size (in about 3–5 chaetigers); in post about same size of parapodia; int gls absentSmall, rounded from ch 15–16, then triangular and lanceolate post; int gls presentInterramal papillaePresentPresentPresentPresentPresentAcicular chaetae number in ch 1 and 2Ch 1–2, short, slender, blunt tips; 2–6Ch 1–2, curved, blunt tips; 4–6 in ch 1, 6–8 in ch 2Ch 1–2, short, pointed tips; 8–9Ch 1–2, short, slender, blunt tips; 5 in ch 1, 9–11 in ch 2Ch 1–2, short, blunt tips; 7 in ch 1*, 13–14 in ch 2*Lyrate numberUp to 147–8 in ch 34–6 post chUp to 1312 in ch 25*8–12 further backTines of lyrate chaetaeUnequal sizeUnequal sizeEqual sizeUnequal sizeUnequal sizeCapillariesSmoothHirsuteSmoothSmooth with some hirsuteHirsute and some smooth*Body pigmentNot reportedCh 3–5 with dors yellow tranverse pigm bands; dorsal and ventral cirri with yellow glsAnnular rings with or without small pigm gls; inconspicuousNo pigm or gls observedPatches of pigm vent parapodia on ch 4–6; dorsally on ch 4–5.Posteriormost region??Last 2–3 segs cirriferous and achaetousWith 2 segs cirrigerous and achaetous, tri annuli; one without chaetae or cirriWith 2–3 segs cirrigerous and achaetous; 1–3 preanal segs lacking all featuresPygidiumAt least 3 anal cirriRounded, with ca. 10 short lobes; with 5 anal cirriAnus with short lobes; with 3 long anal cirri (1 ventr and 2 mid-ventr)With crenulated ring around anus; with 6 anal cirri (3 different lengths) inserted ventrWith crenulated ring around anus; with 5 long anal cirri, inserted ventrDistributionW Atlantic (SE USA, N Carolina to Florida); 17– 218 m depth.NE Atlantic (Norwegian sea, shelf and slope); 497–1,243 m depthSW Atlantic (SE Brazil); 38–100 m depthNE Atlantic (SW France to Moroccan coast); 55–102 m depthNE Atlantic (UK, France, Mediterranean Sea); 6–89 m depth* (down to 300 m (OBIS 2025)ReferenceBertelsen and Weston (1980), Kudenov (1984), Blake (2025)Bakken et al. (2014), Blake (2025)Mendes et al. (2023), Blake (2025)Present studyMackie (1991), Blake (2025), present study ......continued on the next page