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These critters have taken up residence in standing water in a small terrarium. It is home to several frogs and lizards. If they will coexist peacefully, I have no objection. If they will harm plants or critters I'll have to evict them.enter image description here

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Those are collembolans. The common name is "springtail". Several groups of collembola are semi-aquatic. They are not larvae, but adults. There is a nice paper on aquatic collembolans here: https://link.springer.com/chapter/10.1007/978-1-4020-8259-7_36

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    $\begingroup$ Not harmful at all. $\endgroup$ – Karl Kjer Apr 21 '18 at 17:21

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