People use the vernacular AND taxonomic names of species in everyday speech and writing - just read or watch any populist gardening magazine or television programme.
Consider this list: "Blackbird", "poodle", "T Rex", "potato", "French Marigold", "Wisteria", "E. Coli", "HIV", "Rubella" and "human being".
"T Rex" is "Tyrannosaurus rex"; "E. Coli" is "Escherichia coli"; "HIV" is "Human immunodeficiency virus" and "Rubella" is "Rubella virus". All are the taxonomic (or scientific) names of unique species.
"Wisteria" is a taxonomic genus.
"Blackbird"; "poodle"; "potato"; "French Marigold" and "human being" (arguments about Neanderthals not withstanding) are vernacular (or common) names, but still refer to individual species.
Imagine viewing a web page with a reference to a species - and being able to use an add-on to you browser to be taken directly to information about that species, on, say, Wikipedia, or Wikispecies, or Google Images, or another site, such as in an academic database, of your choosing.
Your software would automatically know to search site A of the scientific name referred to a moth, site B for a bird, and site C for a plant - and you could set your preferences as to which sites those were to be, and in which rder two or more were to be searched (e.g. for moths, try UK Moths first, if not found try The Global Lepidoptera Names Index.
That's what a "species" microformat might do for you.
Here's some work-in-progress: