sentences:  Thus, the red-tailed and mailed butterflyfishes probably represent a case of convergent evolution and perhaps mimicry.What selection forces were responsible for the striking similarity between two rather unrelated "Chaetodon" is not known.The highly anomalous 12S rRNA mtDNA sequence found in this species in one 2007 study seems to be due to a laboratory error; in another study a 12S rRNA sequence agreeing with the general pattern of mtDNA evolution in "Rabdophorus" was found.