Appears someone got some AMAZING shots of these parasites in shrimp molts... and it's not just in Caridinas. (no surprise there! just, there's at least one or more Neo specific parasites out there that don't bother Caridinas!)
It's in this video below.... actually see them about 12 minutes in. (be sure to watch in 1080p!)
One person thinks they might be apostome ciliates, also seen in saltwater shrimp.
http://www.bioone.org/doi/abs/10.1111/j.1550-7408.2004.tb00598.x?prevSearch=&journalCode=eumi
And doing a quick search shows some scary stuff.... and interesting pages!
Appears as if copepods can't even be free of these things.... yeeghads!
https://www.researchgate.net/publication/294284052_Biology_of_Symbiotic_Apostome_Ciliates_Their_Diversity_and_Importance_in_the_Aquatic_Ecosystems
https://www.researchgate.net/publication/228498029_Symbiosis_of_planktonic_copepods_and_mysids_with_epibionts_and_parasites_in_the_North_pacific_diversity_and_interactions
And now I feel like molts should never be left in the aquarium...