pars 1897  Glyphioceras.-Crick & Foord: 219.
pars 1903  Glyphioceras.-Crick & Foord: 182.
     1909  Adelphoceras.-Girty: 64.
     1911  Adelphoceras.-Girty: 104.
pars 1914  Adelphoceras.-Wedekind: 11.
  ?  1918  Girtyoceras.-Weekind: 140.
     1918  Sagittoceras.-Hind: 446.
     1923  Girtyoceras.-Brüning: 33, 265.
     1924  Sagittoceras.-Bisat: 72, 82-83.
  ?  1924  Adelphoceras.-Plummer & Scott: 173.
     1924  Dryochoceras.-Morgan: 185.
     1924  Sagittoceras.-Bisat: 82.
pars 1925  Homoceras.-Schmidt: 575.
     1928  Sagittoceras.-Bisat: 125.
     1929  Sagittoceras.-Schmidt: 69.
     1929  ? Sudeticeras.-Patteisky.
     1932  Sagittoceras.-Kobold: 503.
     1933  Sagittoceras.-Bisat: 256.
     1934  Sagittoceras.-Miller: 31-36,
     1934  Girtyoceras.-Miller: 33.
     1934  Sagittoceras.-Bisat: 297.
     1936  Sagittoceras.-Moore: 137.
     1937  Sagittoceras.-Plummer & Scott: 324-325,
     1937  Adelphoceras.-Plummer & Scott: 173.
     1940  Girtyoceras.-Miller & Furnish: 363.
     1940  Sagittoceras.-Delepine:77.
     1941  Girtyoceras.-Moore: 253.
     1946  Girtyoceras.-Moore: 397.
     1952  Girtyoceras.-Bisat: 165.
     1957  Girtyoceras.-Treatise: 59.
     1960  Girtyoceras.-Ruzhentsev: 204.
     1961  Goniatites (Girtyoceras).-Kullmann: 313.
 ?  1962  Girtyoceras.-Osnovy: 368.
     1963  Girtyoceras.-Nicolaus: 120  (with extended synonymy list).
 ?  1964  Girtyoceras.-McCaleb, Quinn & Furnish: 12.
     1965  Girtyoceras.-Gordon: 226.
     1971  Girtyoceras.-Ruzhentsev & Bogoslovskaia: 168.
     2008  Girtyoceras.-Korn & Ebbighausen:

Type species: Adelphoceras meslerianum Girty, 1909, p.66 [OD].

Girtyoceras WEDEKIND, 1918, p.140 [*Adelphoceras meslerianum GIRTY, 1909, p.66; OD]. [nom. subst. pro Adelphoceras GIRTY, 1909, p.64, same type, OD, non BARRANDE, 1870, pl.459, for discussion see WEDEKIND, 1918, p.140;
= Sagittoceras HIND, 1918, p.446, type S. acutum, M (subj.), for discussion see GORDON, 1965, p.227; = Dryochoceras MORGAN, 1924, p.185, type D. brainerdi, M (subj.), for discussion see MILLER, 1934, p.3; = Jeminayceras WANG, 1983,
p.520, type J. heishantouense, p.520; OD (subj.)].

A:   Conch form in young stages with wide umbilicus and low whorl section, later with small umbilicus; tendency to form an
acute venter on relatively young stages.
B-D: Shell surface in young stages commonly smooth, later temporarily ribs or umbilical nodes; constrictions may be present.
E:   No ventro-lateral grooves.
G:   Ventral lobe wide, with roundedly or straight diverging sides; median saddle reaches about half the height of ventral
lobe. First lateral saddle narrowly rounded, sometimes spatulate. Adventitious lobe moderately deep, pointed and relatively wide.
[Jeminayceras is based on two small poorly preserved specimens, which exhibit a relatively high umbilical shoulder].