1879  Xenodiscus Waagen: 32.
     1895  Xenodiscus.-Waagen: 161,
     ----  Xenaspis Waagen: 161.
     1900  Protophiceras Hyatt:
     1903  Proceratites Kittl: 28.
     1932  Xenodiscus.-Smith: 42.
     1934  Xenodiscus.-Spath: 71.
     1940  Xenodiscites Miller & Furnish: 74.
     1957  Xenodiscus.-Kummel in Arkell, Kummel & Wright: L130.
     1958  Xenodiscus.-Kiparisova: 22.
     1966  Xenodiscus.-Furnish: 290.
     1975  Xenodiscus.-Spinosa, Furnish & Glenister: 270.
     1978  Xenodiscus.-Zhao, Liang & Zheng: 106.
     2002  Xenodiscus.-Leonova: S100.

Type species: Xenodiscus plicatus Waagen, 1879, p.34; SD Waagen, 1895, p.161, = Ceratites carbonarius Waagen, 1872, p.355 (subj., teste Spinosa, Furnish & Glenister, 1975, p.270).

[Spinosa et al., 1975:] Smooth to weakly plicate xenodiscins with parallel flat flanks in large whorls (diameter greater than 50 mm).- Shell discoidal, W/D commonly 15-30 percent, and extremely evolute, U/D generally 40-60 percent at maturity, flanks roughly parallel, venter broadly rounded, bluntly angular or subquadrate. Ornament consists of relativle subdued plications, with variable relief, ranging from coarse and widely spaced to faint and closely spaced. Sutural formula: [Russ.] (V1 V1)L I I1:(D1 D1).

Fig. see TAX3268, TAX3266 B: X. carbonarius (Miller & Furnish, 1940, fig.19).