Veryhachium oligospinosum (Eisenack, 1934 ex Eisenack, 1938) Downie and Sarjeant, 1965

Now Estiastra? oligospinosa (an acritarch species). Originally Hystrichosphaeridium oligospinosum, subsequently Pulvinosphaeridium oligospinosum (an acritarch species), thirdly Veryhachium oligospinosum, fourthly
Goniosphaeridium oligospinosum (an acritarch species), fifthly (and now) Estiastra? oligospinosa (an acritarch species); see also Ovum hispidum ssp. oligospinosum (name not validly published). The combination Veryhachium
oligospinosum was not validly published in Deunff, 1954 since that author neither fully referenced the basionym nor clearly used the name Veryhachium oligospinosum. It was not validly published in Downie and Sarjeant, 1963 and Eisenack, 1963 since these authors did not fully reference the basionym.
Holotype: Eisenack, 1934, pl.4, fig.18; lost according to Eisenack et al., 1973
Age: Silurian (based on material from an erratic)