Sosane cinctus Hartman 1965

Sosane cf. cinctus (Hartman, 1965)

(Fig. 8 A–C)

Muggoides cinctus Hartman, 1965: 221 –222, pl. 48, figs. c–e Mugga cinctus: Jirkov 1994b: 35.

Sosane cinctus: Jirkov 2001: 486; Jirkov 2008: 114, tab. 1

Specimens examined. North of Tokunoshima Island, 28°03.79'N, 128°56.31'E – 28°04.71'N, 128°57.59'E, 533– 583 m, KH-05-1, St.OT-10, 5.2005 (1cs).

Additional material examined.

Melinnata americana Hartman, 1965

Holotype: LACM-AHF POLY 246. North Atlantic, USA, New England continental slope, 36°23’30”N, 68°04’30”W, 4850 m, anchor dredge, R/V Atlantis, Sta. KK 1, coll. Sanders, H., Woods Hole Oceanographic Institution, 10 Aug. 1961.

Paratype: LACM-AHF POLY 247. Collected at same station as holotype.

Muggoides cinctus Hartman, 1965

Holotype: LACM-AHF POLY 242. North Atlantic, Bermuda, Bermuda slope, 32°17’00”N, 64°35’W, 1700 m, R/V Atlantis, Sta. Bermuda 4, 2 May 1960.

Paratype: LACM-AHF POLY 243. Collected at same station as holotype.

Description. Length 3.4 mm, width 0.4 mm. Prostomium with middle lobe delimited by incision, without glandular ridges or eyes (Fig. 8 A). Buccal tentacles unknown. Lower lip crenulated (Fig. 8 A). Branchiae lost; scars in segment II visible, but exact number and position of branchiae indeterminable. Fused segments II + III with 1 pair of thin capillary notochaetae, notopodia reduced (Fig. 8 A). Notopodia with capillary notochaetae from segment IV, first 2 pairs reduced in size. 14 thoracic chaetigers. Notopodia in last thoracic unciniger elevated, basally inflated, with terminal conical lobe, connected by dorsal ridge (Fig. 8 B); notochaetae of modified unciniger in fan-like arrangement on convex side of notopodia, with hirsute tips (Fig. 8 C). Neuropodial tori with uncini from segment VI, present in 11 thoracic uncinigers. Cirri and papillae in thoracic parapodia absent. Continuous ventral shields distinct to thoracic unciniger 8, faint to thoracic unciniger 11. Two intermediate uncinigers. Eight abdominal uncinigers. Rudimentary notopodia and glandular pads in intermediate and abdominal uncinigers absent. Pinnules without cirri or papillae. Pygidium with terminal anus and 1 pair of lateral blunt lobes. Thoracic and abdominal uncini with crest of numerous teeth above rostral tooth and basal prow.

Remarks. During the examination of holo- and paratypes of Sosane cinctus (Hartman, 1965) we found that the species has 4, rather than 3 pairs of branchiae. The number of branchiae is, even with methyl green staining, indeterminable in specimens where branchiae are broken off, e.g. in the holotype. Several paratype specimens, however, have a complete set of 4 pairs of branchiae. Numbers of thoracic chaetigers and uncinigers are 14 and 11, respectively, which is in contrast to the 13 thoracic chaetigers and 10 thoracic uncinigers given in the original description.

In our single specimen all branchiae are broken off. We were not able to determine the number of branchiae. All other characters, however, agree with those observed in S. cinctus.

Distribution. The species has only been recorded from its type locality Bermuda. Records (as Muggoides) with uncertain species affiliation exist from Cape Hatteras off the coast of North Carolina as Muggoides nr. cinctus (Hilbig 1994) and from the Southern Ocean as Muggoides cf. cinctus (Schüller & Ebbe 2007) and Muggoides sp. 1 (Hilbig 2004; Brandt et al. 2007), respectively. Newly recorded from the East China Sea.