Lower the currently selected frame so that it disappears under any frame that overlaps it. If multiple frames are selected they are all lowered in turn
Arion subfuscus (Draparnaud, 1805) and A. fuscus (Müller, 1774) have very similar morphology and have overlapping distributional ranges in northwestern Europe.
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Raise the currently selected frame so that it appears above all the other frames. This is only useful if frames overlap each other. If multiple frames are selected they are all raised in turn