TABLE 2 in Jasmineira filatovae Levenstein, 1961, the deepest known sabellid is a Potamethus Chamberlin, 1919: redescription, new combination and generic emendation

TABLE 2. Species of Potamethus currently considered valid, distinctive features and presence of uncinal humps.
SpeciesType localityDorsal collar marginsVentral lappets of collarSemi-circular moldures in lateral sides of anterior peristomial ringNumber of thoracic segmentsVentral shieldsHump in thoracic unciniHump in abdominal unciniP. breviuncatus Hartmann-Schröder, 1977Morocco, 72 mForming two shallow convex semi-circles (Hartmann-Schröder, 1977, p. 97)Triangular, short (as long as the length of chaetiger 1) (Hartmann-Schröder, 1977, fig. 76)?10 (Hartmann-Schröder, 1977, p. 97)?Absent (Hartmann-Schröder, 1977, fig. 77, 80–81)Absent (Hartmann-Schröder, 1977, fig. 82)P. dubius (Eliason, 1951)Nares Deep W Atlantic, 5850–5860 mForming two shallow convex semi-circles (Eliason, 1951, pl. II, fig. 2)Bilobed with tips directed outwards, short (not longer than a half of the length of chaetiger 1) (Eliason, 1951, pl. II, fig. 4)Present (Eliason, 1951, pl. II, figs 4, 6)8 (Eliason, 1951, p. 139)Thoracic shields well developed and conspicuous patches in first 5–6 abdominal segments (Eliason, 1951, p. 140, pl. II, fig. 4)Absent (Eliason, 1951, textfig. 5b)?P. elongatus (Treadwell, 1906)Molokai, Hawaii, 130 mV-shaped, deep (Knight-Jones, 1983, p. 271)???The whole epithelium is glandular (not shields) (Knight-Jones, 1983, p. 271)Present (Treadwell, 1906, fig. 75; Berkeley & Berkeley, 1951, fig. 2)Present (Berkeley & Berkeley, 1951, fig. 4)P. filiformis Hartmann-Schröder, 1977Portugal, 1370–1430 mV-shaped, deep (Hartmann-Schröder, 1977, fig. 70; Knight-Jones, 1983, fig. 11A)Triangular with apex directed outwards, short (not longer than a half of the length of chaetiger 1) (Hartmann-Schröder, 1977, fig. 71; Knight-Jones, 1983, fig. 11C)?8 (Hartmann-Schröder, 1977, p. 97)The whole epithelium is glandular in thorax (not shields), abdomen with sub-triangular patches (Knight-Jones, 1983, p. 272–273)Absent or very shallow (Hartmann-Schröder, 1977, fig. 74)?P. filatovae (Levenstein, 1961), new comb.Bering Sea, 3812– 3940 mV-shaped, shallow (this study)Rounded, short (as long as the length of chaetiger 1) (this study)Present (this study)8 (this study)Ventral shields well developed in thorax, abdomen with sub-triangular patches (this study)Present, shallow (Levenstein, 1961, fig. 10 r; this study)Present (this study, fig. 3H–I). Levenstein (1961) illustrated an abdominal uncini (fig. 10) without hump, but syntypes examined in this study have these (fig. 3H–I)P. japonicus (Johansson, 1922)Sagami Bay, Japan, 45–60 mForming two shallow convex semi-circles (Johansson, 1922, p. 8, pl. 1, fig. 4)Rounded, short (not longer than a half of the length of chaetiger 1) (Johansson, 1922, p. 8, pl. 1, fig. 3)?17 (Johansson, 1922, p. 8)Ventral shields well developed at least in thorax, but not distinctly limited at the sides (Johansson, 1922, p. 8)Absent (Johansson, 1922, pl. 4, fig. 5)Absent (Johansson, 1922, pl. 4, fig. 6)P. malmgreni (Hansen, 1878)Norwegian Sea, 2127– 2222 mV-shaped, shallow (this study)Slightly rounded to straight, short (not longer than a half of the length of chaetiger 1) (Hansen, 1882, pl. VII, fig. 23; This study)Present (this study)8 (I.A. Jirkov samples examined in this study)The whole epithelium is glandular (not shields) (Knight-Jones, 1983, p. 271) but specimens from the Norwegian Sea examined in this study have well developed shields in thorax and abdomen (Fig. 5D–E)Present (Hansen, 1882, pl. VII, fig. 26b; Eliason, 1951, text-fig. 5e)Absent (Hansen, 1882, pl. VII, fig. 27)P. mucronatus (Moore, 1923)Catalina Island, California, 1000 m?Prominent rounded lobes (length not specified) (Moore, 1923, p. 244)?9 (Moore, 1923, p. 244)The whole epithelium is glandular in thorax (not shields), abdomen with sub- triangular patches (Moore, 1923, p. 244, Knight-Jones, 1983, p. 272)Present (uncinus not fully illustrated in original description by Moore, 1923, pl. 18, fig. 44; present in the redescription of syntypes provided by Harman, 1942; fig. 15 h, j; present in Hartman 1969, pp, 719, fig. 3)?P. murrayi (McIntosh, 1916)North Atlantic Ocean, 1014 mV-shaped, deep (McIntosh, 1916, p. 55)Rounded, short (not longer than a half of the length of chaetiger 1) (McIntosh, 1916, pl. 1, fig. 1)Present (McIntosh, 1916, p. 55, pl. 1, fig. 2)? The whole epithelium is glandular (not shields) (Knight-Jones, 1983, p. 272)Present (McIntosh, 1916, pl. 1, fig. 6)Present (McIntosh, 1916, pl. 1, fig. 9)P. scotiae (Pixell, 1913)Weddell Sea, 650 mV-shaped, deep (Knight-Jones, 1983, fig. 11L)Rounded, short (as long as the length of chaetiger 1) (Knight-Jones, 1983, fig. 11M)?8 (Pixell, 1913, p. 357)Ventral shields well developed in thorax, abdomen with sub-triangular patches (Knight-Jones, 1983, p. 271)Present (Pixell, 1913, fig. 7a–b)Present (Pixell, 1913, fig. 7e)P. singularis Hartman, 1965New England, 200–2000 mOblique (Knight-Jones, 1983, fig. 11P)Triangular, with apex directed to lateral sides, short (as long as the length of chaetiger 1) (Knight-Jones, 1983, fig. 11Q)?8 (Hartman, 1965, p. 234)The whole epithelium is glandular (not shields) (Knight-Jones, 1983, p. 272)? Drawing of thoracic uncinus only show crest and distal part of neck (Hartman, 1965b, pl. 52, fig. h)?P. spathiferus (Ehlers, 1887)Florida, off Sambos, 130 mV-shaped, deep (Ehlers, 1887, pl. 54, fig. 10)Triangular, long (2.5 times the length of chaetiger 1), reaching basal union of radioles (Ehlers, 1887, pl. 54, fig. 8)Present (Ehlers, 1887, pl. 54, figs 9, 10)8 (Ehlers, 1887, p. 279)The whole epithelium is glandular (not shields) (Ehlers, 1887, p. 278, Knight-Jones, 1983, p. 271)Present (Ehlers, 1887, pl. 55, fig. 1a)? Not easy to determine (Ehlers, 1887, pl. 55, fig. 4)
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