Litosphaeridium siphoniphorum subsp. glabrum Lucas-Clark, 1984, p.186-187, pl.1, figs.1-11; pl.2, fig.2. Holotype: Lucas-Clark, 1984, pl.1, figs.2-3; Fauconnier and Masure, pl.53, fig.11. Age: Albian-Cenomanian. Parent: Litosphaeridium siphoniphorum