Stellechinatum uncinatum (Downie, 1958) Molyneux, 1987

Originally Hystrichosphaeridium longispinosum var. uncinatum, subsequently Baltisphaeridium longispinosum var. uncinatum (an acritarch varietas), 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; see also Goniosphaeridium polygonale ssp. uncinatum (an acritarch subspecies; combination not validly published).
Taxonomic junior synonym: Goniosphaeridium regulare Yin Leiming in Chen Junyuan et al., 1985, an acritarch species, according to Yin Leiming (1986, p.347).

Holotype: Downie, 1958, textfig.2a
Age: Early Ordovician