"Our results support the presence of three morphologically distinct forms, which will be referred to herein as T. newberryi, T. longicaudatus 'short,' and T. longicaudatus 'long.' "..."The three forms were morphologically distinct for multiple characters and molecular analyses showed large differences in DNA nucleotide sequence and the presence of multiple unique amino acid substitutions in each form." (Journal of Crustacean Biology, Volume 31, Issue 3, 1 July 2011)
Yet, they remain within the same basic structure of the life form. This is variation and not evolution, e.g. transformation.