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.
Facts
Comparison
Taxonomic Rank Order Living or Extinct
Sources
1. Wikipedia: Taxonomic rank
WikipediaTaxonomic rank, Fundamental ranks section, rank sequence sentence, fungus generaQuote, Taxonomic rank, Fundamental ranks section, rank sequence sentence, fungus genera
kingdom, phylum or division, class, order, family, genus, and species
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