From Williams et al., 2017:

[Acanthogonyaulax, Sarjeant, 1966b, p. 132
Substitute name: Acanthaulax

Type species: as Gonyaulax venusta, Klement, 1960 (pl.5, figs.10-11)]

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Original description: [Sarjeant, 1966]:

Description:
Proximate dinoflagellate cysts, spherical, ellipsoidal, ovoidal or polyhedral, with the tabulation 3-4`, 0-1a, 6``, 6g, 6```, 1p, 0-1p.v., 1````.
Cingulum strongly or weakly helicoid; sulcus generally or constantly extending onto epitract.
Apical horn present only infrequently; median and antapical horns lacking.
Sutures in form of low ridges bearing rows of spines. Shell bearing general cover of simple or furcate spines, identical to or differing from those on sutures; spines fewer or totally lacking on cingulum and/or sulcus. Length of spines always less than 1/4 of shell width.
Surface smooth, granular, nodose, punctate or reticulate.
Precingular archeopyle formed by loss of plate 3``.