From Williams et al., 2017:

[Pterococcus, Lohman, 1904, p. 47

Name illegitimate - senior homonyms: Pterococcus Pallas, 1773 and Pterococcus Hasskarl, 1842.
Taxonomic senior synonym: Nematosphaeropsis, by implication in Reid (1977, p.592) and Fensome et al. (1993b, p.93), who included the "type species" of Pterococcus, Pterococcus labyrinthus, in Nematosphaeropsis.

Type species: Pterosperma labyrinthus, Ostenfeld, 1903 (fig.127)]