"perforatum" Marheinecke, 1986, p.27. Name not validly published: no description. NOW Neonorthidium. Originally Northidium (name not validly published), subsequently (and now) Neonorthidium. Marheinecke (1986, p.27), indicated that this name is from an unpublished thesis by G. Wilson. Age: late early–early late Maastrichtian.