Back
Baltisphaeridium claviferum
Baltisphaeridium claviferum, (Wilkinson, 1849), Downie and Sarjeant, 1965
Originally Xanthidium (an extant desmid genus), subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium. According to Wilkinson, 1849, "this species was originally named Xanthidium tubiferum dilatatum, but as the duplex trivial name is contrary to the rules of nomenclature, it has been thought advisable to alter it to Xanthidium claviferum ...". This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Wilkinson 1849, pl.13, fig.1
Age: Late Cretaceous
Originally Xanthidium (an extant desmid genus), subsequently Hystrichosphaeridium, thirdly (and now) Baltisphaeridium. According to Wilkinson, 1849, "this species was originally named Xanthidium tubiferum dilatatum, but as the duplex trivial name is contrary to the rules of nomenclature, it has been thought advisable to alter it to Xanthidium claviferum ...". This combination was not validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.
Holotype: Wilkinson 1849, pl.13, fig.1
Age: Late Cretaceous