Desmoxytes planata, The Pink Dragon Millipede (not to be confused with "the shocking pink dragon millipede", Desmoxytes purpurosea), is a small millipede in the family Paradoxosomatidae, order Polydesmida - "the flat backed millipedes". It is relatively easy to keep, though even experienced keepers report that their colonies are susceptible to unexplained crashes and booms.
Adults are ~2 cm long, posses a dark brown body and have pink spines along both sides of their body. Despite their appearance these spines aren't dangerous, in fact the millipede is really fragile, and may be harmed accidentally when you disturb the substrate. The juveniles are slightly translucent with a milky hue, getting their colours as they mature. Dead individuals turn grey quickly after perishing.
Care
The most important part of care is giving the millipedes ample access to moist decaying plant matter. This is done by using a substrate high in leaves, flake soil, or white rot wood. (personally I found a ton of success with just flake soil and a thick leaf litter layer) Make sure that the substrate is kept moist at all times(80-90%). A source of calcium should always be available. Due to their hungry nature and tendency to deplete the substrate quickly I suggest using something that you can see, such as crushed egg shells, rather than powder.
It is likely that you will have the substrate become depleted in just a few month of starting your colony. This will first be noticeable when the top ~1 cm becomes mostly frass, rather than edible materials. At that point you can either add more fresh substrate on top, or transfer the millipedes to another container. Failing to do so will result in them not reproducing,
Food:
As mentioned previously, the bulk of their diet is the substrate in which they live in. I have seen them eat cucumber, dried shrimp, fish flakes, and oyster mushrooms. Due to their high humidity requirement the supplemental food is very likely to rot quickly, so make sure that you have springtails ready to deal with this issue.
Handling:
I suggest not doing that. They are extremely fragile, and have the ability to release hydrogen cyanide when threatened.
I have attempted to observe this response, and have found that they can be coaxed into releasing a translucent-white liquid from the anal segment by repeated poking. As far as we are aware the quantity of HCN produced does not pose a threat to humans, but I'd still advise caution.
Personal notes:
Having them is mostly fun as something to bring up to others. Their population swings randomly, and that can cause a lot of headaches. You might think that they would serve as an amazing display species due to their relatively non hiding nature and bright colours, but their enclosure quickly becomes covered in frass and disappointing to look at. The dangers of handling them also are something to consider.