Cordosphaeridium palmatum (White, 1842) De Coninck, 1965

Now Hystrichosphaeridium recurvatum. Originally Xanthidium tubiferum var. palmatum, subsequently Xanthidium palmatum, thirdly Spiniferites palmatus, fourthly Cordosphaeridium palmatum, fifthly (and now) Hystrichosphaeridium recurvatum; see also Hystrichosphaeridium palmatum (combination illegitimate) and Hystrichosphaeridium duplum (combination illegitimate).
Nomencl. synonym of Xanthidium tubiferum var. palmaforme White, 1842 and Xanthidium tubiferum var. recurvatum White, 1842, which have the same holotype. Bronn, 1848, Sarjeant, 1964, and Stover and Evitt, 1978, regarded Xanthidium palmatum as the sr. synonym. When Downie and Sarjeant, 1965, transferred this species to Hystrichosphaeridium Deflandre, 1937, they created a junior homonym of Hystrichosphaeridium palmatum Deflandre and Courteville, 1939. Accordingly, Lentin and Williams, 1989, proposed the name Hystrichosphaeridium duplum as a nom. subst. for Hystrichosphaeridium palmatum (White, 1842) Downie and Sarjeant, 1965. By doing this Lentin and Williams, 1989, created a nomencl. jr. synonym of Xanthidium tubiferum var. recurvatum White, 1842, which has priority.
Holotype: White, 1842, pl.4, fig.12
Age: Senonian