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Message: <blockquote data-quote="Gavia_immer" data-source="post: 1539886" data-attributes="member: 65934">Chapter 5: The Plebicula Blues: Mother-of-Pearl BlueAnd finally, the last of the Plebicula species that can be found in Europe. It is Mother-of-Pearl Blue (Plebicula nivescens). The underwing is very similar to the one of Turquoise Blue. In fact, I don't know any reliable feature to separate them only by the underwing. But if you see its underwing and get to see the typical pattern of a Plebicula (pic 1), a glimpse of the upperwing is enough to know it is Mother-of-Pearl Blue: the upperwing is silvery grey (or Mother-of-Pearl colour <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> (pic 2) instead of bright turquoise blue.And again, thanks to Marian for her pics. She is the Plebicula girl, no doubt about it</blockquote>