In biologic nomenclature, a term used to denote one of two or more names for the same species or taxonomic group (taxon).
objective s.'sdifferent names for the same organism, based on one and the same nomenclatural type, as when a species is transferred from one genus to another (e.g., the transfer of Diplococcus pneumoniae to the genus Streptococcus as Streptococcus pneumoniae), in contrast to subjective s.'s.
senior s.the earliest published of two or more available names for the same organism, usually used as the correct name (law of priority).
subjective s.'sdifferent names, based on different nomenclatural types, for organisms that were originally regarded as different but were later considered to be identical, or nearly so, as a matter of personal opinion, in contrast to objective s.'s.
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