I actually believe that the true "banana pectinata" may be a separate sub-species of ctenosuara. One, they dont get as large as the typical mexican pectinata, they seem to be a little more stocky (at least males), if the heads have black, the black is a deep dark black, and obviously have a deep rich yellow or orange color oppose to the pale yellow, whitish yellow, or yellow gray of the common mexican pectinata. They also seem to have a more mellow demeanor than common pectinatas, even when captive raised from babies. Color alone, is not a determiner of a sub species, and an extensive scale count from both and DNA work may need to be done by a legit researcher to determine whether my belief is correct.