Actually just purchased a Noah line Ultramel today. My understanding, which is open to correction, is there are Ultramels and Criders. Both are actually Ultramel morphs but the snakes typically labeled ultramels are the Noah ultramel line and those labeled criders are from the Crider/Russo ultramel line. Ultramels and Criders were thought to be compatiable, then incompatiable, then J. Kobylka proved their compatibility.

http://jkrballstreetjournal.com/2014...russo-results/