Abstract
The Ediacaran acritarch genera MegasphaeraChen and Liu, 1986, MembranosphaeraLiu and Moczydłowska, 2019, VerrucosphaeraLiu and Moczydłowska, 2019 have the same spelling as Megasphaera Rogosa, 1971, Membranosphaera Samoilovitch in Samoilovitch and Mtchedlishvili, 1961, VerrucosphaeraGórka, 1970, respectively. Among them, the interpretation of bacterial affinity of MegasphaeraChen and Liu, 1986 is largely abandoned due to its morphological complexity. MegasphaeraChen and Liu, 1986 is not a homonym of extant bacterial genus Megasphaera Rogosa, 1971, since they are governed by two mutually independent Codes of Nomenclature. MembranosphaeraLiu and Moczydłowska, 2019, and VerrucosphaeraLiu and Moczydłowska, 2019 are the later homonyms of acritarch genera Membranosphaera Samoilovitch in Samoilovitch and Mtchedlishvili, 1961 and VerrucosphaeraGórka, 1970, respectively. Therefore, they are illegitimate and unavailable for use under the International Code of Nomenclature for algae, fungi, and plants. In the study, the two genera are formally replaced by Membranospinosphaera Shang and Liu, and Spinomargosphaera Shang and Liu. All species under the previous illegitimate genera are transferred into the replacement genera. Meanwhile, the diagnoses of genus Membranospinosphaera and its type species M. formosa are emended in current study, relying on the full examinations of the holotype and paratype. A new species of Membranospinosphaera copia sp. nov. is erected on the basis of new materials.
Published Version
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