Micrhystridium uncinatum (Downie, 1958) Cramer, 1970

Now Stellechinatum uncinatum (an acritarch species). Originally Hystrichosphaeridium longispinosum var. uncinatum, subsequently Baltisphaeridium longispinosum var. uncinatum (an acritarch varietas), thirdly Baltisphaeridium uncinatum (an acritarch species), fourthly Micrhystridium uncinatum, 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