Platynothrus punctatus has a Holarctic, boreo-alpine distribution, which means that it occurs in the northern latitudes, e.g., in nothern Norway, and at higher altitudes, e.g., at Hardangervidda in Norway, and Sierra Nevada in southern Spain. It prefers aquatic or damp microhabitats. Its reproduction is parthenogenetic, that is, only females are present and they are produced from unfertilized eggs.
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