Scalibregma abyssorum Hansen 1879

ScalIbregma abyssorum Hansen, 1879, nomen dubium

Scalibregma (?) abyssorum Hansen, 1879: 6 –7, pl. V, figs 1–6.—1882: 34–35. Scalibregma abyssorum. — Furreg 1925: 170.

Scalibregma inflatum.— Støp-Bowitz 1945: 70 –71.

Material examined. The Norwegian North-Atlantic Expedition 1876–1878, Norwegian continental shelf break, Sta. 18, 62°44'N 1°48'E, 753 m, holotype of Scalibregma abyssorum (ZMBN 2274).

Remarks. The description of Scalibregma abyssorum was based on one incomplete specimen (Hansen 1879; 1882). The species was stated to have three segments with gills, a squarish prostomium without lateral processes, anterior segments with no dorsal annulation, and furcate chaetae in neuropodia only. One incomplete specimen labelled as original material is kept in the collections of the University Museum of Bergen. Støp-Bowitz (1945) examined the specimen and noted that it had four pairs of branchiae and a prostomium with frontal horns. The branchiae were situated on chaetigers 2–5, as in S. inflatum. He concluded that it referred to a small specimen of S. inflatum. The examination of the specimen in the present study supports the observations by Støp-Bowitz (1945). The specimen is damaged, broken after chaetiger 13, and has lost parapodia on the right side. Bushy gills are present on chaetigers 2–5. The specimen, however, differs in several respects from the description and figures given by Hansen (1879, 1882), for instance in the dorsal annulation of segments, the development of prostomial frontal horns, and the number of gills. It may therefore be suspected that the deposited specimen is not the one Hansen (1879; 1882) used for his species description. The species is here considered indeterminable.