Spiniferites cornutus ssp. Iaevimurus (Davey and Williams 1966) Lentin and Williams 1973

NOW Spiniferella cornuta subsp. laevimura. Originally Hystrichosphaera cornuta var. laevimura, subsequently Spiniferites cornutus subsp. laevimurus, thirdly (and now) Spiniferella cornuta subsp. laevimura.
Taxonomic senior synonym (at subspecific rank): Hystrichosphaera cornuta var. cornuta (as Spiniferites cornutus subsp. cornutus, now Spiniferella cornuta subsp. cornuta), according to Cookson and Eisenack (1974, p.62) — however, Below (1982c, p.33) retained Hystrichosphaera cornuta var. laevimura (as Spiniferites cornutus subsp. laevimurus, now Spiniferella cornuta subsp. laevimura).
Taxonomic junior synonyms (at subspecific rank): Spiniferites cornutus var. crassifurcatus (as Spiniferites cornutus subsp. crassifurcatus), and Spiniferites cornutus var. normalis (as Spiniferites cornutus subsp. normalis), both according to Below (1982c, p.33).

Holotype: Davey and Williams, 1966, pl.4, fig.5; Bujak et al., 1980, pl.4, figs.9,12
Locus typicus: Kent, England
Stratum typicum: Early Eocene

Original diagnosis: Davey and Williams, 1966, p.44: Hystrichosphaera cornuta ssp. Iaevimura.
A variety of H. cornula (Gerlach) with smooth surfaced central body. Gonal and sutural processes short and subconical. A large distinctive apical process present often bearing small lateral spines.
Dimensions: holotype: diameter of central body 43 by 53 µm, length of processes up to 12 µm.
Range: diameter of central body 34-64 µm, length of processes up to 14 µm, length of apical process 16-32 µm.