Teneb fan
L1
I have only Tenebrionid beetles in my terrarium. For a long time, I only had various species of DFBs, plus a five little Tenebs. But in May and July 2020, I ordered more species of Tenebs from Bugs in Cyberspace, including six large darkling beetles and two large Eleodes obscura. Then, a week ago, I noticed a lot of white specks on the substrate. Since the DFBs don't breed in captivity unless great efforts are made and great care is taken (e.g. Aquarimax), I didn't expect the other Tenebs would breed. Finally, the penny dropped - eggs! Looking closely with reading glasses and a magnifying glass, I saw well over a dozen very minute larvae, 1/4" long or less, wriggling about. One was bigger, about 3/8" long; I could see its segments. I was very excited about this new development, though I knew that getting any larvae to pupate, not to mention the pupae to metamorphose into adults, was a long shot. I put down some slices of organic Persian cucumber (skin cut off), which is a favorite food of many of my beetles. I thought this would be good food & hydration for the little newbies. But the next day, all of them had expired! I wrote to Peter Clausen about the experience and he asked me why I thought they expired -- had I separated them? I told him no, I just left them alone. It was disappointing, but interesting to see the first two stages of the reproductive cycle. 
