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Atylotus, many thanks for your reply.

I have a captive Tachytrechus vorax in my cool basement that I collected several months ago. I collected it from the damp sand on the shore of a nearby lake. Recently I started feeding it fruit fly larvae Drosophila melanogaster and now it is growing. I have made time lapse movies of the Tv plowing through the sand with the smaller Dm scurrying about. No confirmed pepredation events so far, but the Dm disappear and the Tv gets bigger. The Tv is faster so I think it is capable of catching them.

Keith Short