blue calamintha bee
... that scientists were unsure whether the blue calamintha bee still existed until it was observed again in March 2020?
... that scientists were unsure whether the <b id="mwCSI"><a href="./Osmia_calaminthae" id="mwCSM" rel="mw:WikiLink" title="Osmia calaminthae">blue calamintha bee</a></b> <i id="mwCSQ">(pictured)</i> still existed until it was observed again in March<span id="mwCSU" typeof="mw:Entity"> </span>2020?