Lingulodinium xanthium (Benedek, 1972, p.27–28, pl.9, fig.8; text-fig.9) Benedek and Sarjeant, 1981, p.342. Emendation: Benedek and Sarjeant, 1981, p.342–343, as Lingulodinium xanthium

NOW Operculodinium. Originally Cordosphaeridium, subsequently (and now) Operculodinium, thirdly Lingulodinium. Stover and Hardenbol (1994, p.33) retained this species in Operculodinium.

Holotype: Benedek, 1972, pl.9, fig.8; Benedek and Sarjeant, 1981, fig.9, no.5
Paratypes: Benedek and Sarjeant, 1981
Age: Middle-Late Oligocene

Emended Diagnosis: Benedek and Sarjeant, 1981, p. 342-343
Cyst skolochorate, acavate. Surface of phragma covered with a fine meshwork of low ridges and giving rise to numerous acuminate nontabular processes, relatively short (about oneeighth or less of the cyst diameter). The processes broaden greatly, and are conspicuously fibrous, towards their proximal ends, the fibres confluent with surficial ridges. Archaeopyle large and angular, formed by the loss of one large (or, more probably, two smaller) precingular paraplates (Type P or 2P).
Dimensions: Holotype--length 83 µm, breadth 100 µm, length of spines 7 µm, breadth of archaeopyle 40 µm. Range of dimensions: Greatest cross-measurement 61-100 µm, length of spines 6-12 µm, breadth of archaeopyle 30-40 µm. Material: 31 specimens.