query: sparql?explain&query=SELECT ?rank WHERE {
    ?rank wdt:P105 wd:Q34740. # Q37517=class; Q36602=order; Q35409=family; Q34740=genus; Q7432=species
    FILTER(NOT EXISTS {
      ?rank schema:description ?itemdesc.
      FILTER(LANG(?itemdesc) = "en") # with missing English description
    })
  } LIMIT 2000