Nematosphaeropsis balcombiana

*balcombiana Deflandre and Cookson, 1955, p.268–269, pl.8, fig.5.  Holotype: Deflandre and Cookson, 1955, pl.8, fig.5.  Taxonomic senior synonym: Pterosperma (as Nematosphaeropsis) labyrinthus, according to Reid (1974, p.592) — however, Wrenn (1988, p.139) retained Nematosphaeropsis balcombiana.  Head and Westphal (1999, p.12) considered this species to be the questionable taxonomic senior synonym of Nematosphaeropsis rigida.  Motile equivalent: Gonyaulax spinifera (Claparède and Lachmann, 1859) Diesing, 1866, according to Wall and Dale (1967, p.352; 1968c, p.270).  Wrenn in Head and Wrenn (1992, p.14) recommended that this name be restricted to the holotype.  Age: middle Miocene.

Parent: Nematosphaeropsis