</a> Courtesy Smithsonian Institution National Numismatic Collection. Rare Currency at The Smithsonian The previous coin's older brother the 1849, Gold Rush era double eagle gold coin is valued by collectors the world over. It was the United States of America's first $20 denominational gold coin. Courtesy Smithsonian Institution National Numismatic Collection.
subspecies - (biology) a taxonomic group that is a division of a species; usually arises as a consequence of geographical isolation within a species. race. biological science, biology - the science that studies living organisms. taxon, taxonomic category, taxonomic group - animal or plant group having natural relations.
The scientific name of a genus is a noun in the singular. The scientific name of a species is a binomen (i.e., consists of two words). The scientific name of a subspecies is a trinomen (i.e., consists of three words). The names of genera, species and subspecies are conventionally underlined or placed in italics.