Phyllorhynchus decurtatus porelli ssp. nov. is described from a single specimen from Cerralvo Island, Gulf of California, Mexico, and is regarded as different from P. d. decuratus on the basis of an increased number of dorsal blotches (41 as compared to 18–33) and an increased number of supralabials (7 as compared to 6), combined with geographical isolation and the high degree of endemism found in other reptiles on Cerralvo Island.
Powers, Arnold L. and Banta, Benjamin H.
"Description of a Phyllorhynchus from Cerralvo Island, Gulf of California, Mexico,"
Great Basin Naturalist: Vol. 34
, Article 11.
Available at: http://scholarsarchive.byu.edu/gbn/vol34/iss3/11