Baltisphaeridium longispinosum var. uncinatum, (Downie, 1958), Downie and Sarjeant, 1965

Now Stellechinatum uncinatum (an acritarch species). Originally Hystrichosphaeridium longispinosum var. uncinatum, subsequently Baltisphaeridium longispinosum var. uncinatum, thirdly Baltisphaeridium uncinatum (an acritarch species), fourthly Micrhystridium uncinatum (an acritarch species), fifthly Goniosphaeridium uncinatum (an acritarch species), sixthly Polygonium uncinatum (an acritarch species), seventhly (and now) Stellechinatum uncinatum (an acritarch species); see also Goniosphaeridium polygonale ssp. uncinatum (an acritarch subspecies; combination not validly published). Tax. sr. synonym of the acritarch species Goniosphaeridium regulare Yin Leiming in Chen Yunyuan et al., 1985, according to Yin Leiming, 1986.

Holotype: Downie, 1958, text-fig.2a
Age: Early Ordovician