1966  Nielsenoceras Furnish: 292.
     1975  Nielsenoceras.-Spinosa, Furnish & Glenister: 269.
     2002  Nielsenoceras.-Leonova: S100.

Type species: Xenaspis skinneri Miller & Furnish, 1940, p.76; OD.

[Spinosa et al., 1975:] Paraceltins distinguished by exceptionally broad prongs of the ventral lobe and by possession
of a shallow groove on the ventrolateral flanks.