Living or extinct separates a taxon's surviving members from those known only from fossils. Wikipedia notes "the 41 officially recognized extant Felidae species" live today, while the "saber-toothed cats" of the extinct subfamily Machairodontinae, including the famous saber-toothed tiger, do not. This dimension lets a visitor tell a still-living branch of a family tree from an extinct one.
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1. Wikipedia: Taxonomic rank
WikipediaTaxonomic rank, Fundamental ranks section, rank sequence sentence, other invertebrate generaQuote, Taxonomic rank, Fundamental ranks section, rank sequence sentence, other invertebrate genera
kingdom, phylum or division, class, order, family, genus, and species
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