The rarity of a species is usually judged by the number of specimens in collections, both private and institutional, and the number of places where it has been found or seen. On this basis, Neurocordulia xanthosoma (Williamson) is rare. Its crepuscular habits, its brown coloration, and its habitat requirements, coupled with the habits of most collectors, have been its protection. Nevertheless, because of its apparent special requirements and man's modification of, and encroachment on, its environment, it may soon be a species of the past.
Williams, Curtis E.
"Neurocordulia (Platycordulia) Xanthosoma (Williamson) in Texas (Odonata: Libellulidae: Corduliinae),"
The Great Lakes Entomologist, vol 9
Available at: https://scholar.valpo.edu/tgle/vol9/iss1/4