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Or even without breathing tube but with two posterior spines, which are used to pierce the parenchym. In this case a Hydrellia spec piercing Lemna gibba. By the way, this is the smallest Hydrellia I have ever seen, normally (in The Netherlands) they are twice this size. Most often (or always) Hydrellia spec. prefer one type of macrophyt and in this case probably restricted to Lemna.