Actually thats a good example for applied science.
Bleeker described a lot of catfish in the 1850s. When he described the species cryptopterus (referring to its dorsal fin, described as a “short slender thread”) he put into the genus Silurus = Silurus cryptopterus, 1851.
A few years later he got another specimen of unknown catfish, not recognizing that it also belongs to S. cryptopterus. He described it as micropus. And he already knew a that point that Silurus as genus does not fit. So he created the new genus Kryptopterus for micropus = Kryptopterus micropus, 1857.
Much later in 1989 Roberts declared micropus as synonym of cryptopterus. And from there we have the name Kryptopterus cryptopterus.