Icthyological Pokemon Field Guide Phylogeny

What about Remoraid and Octillery? I get that Remoraid is based on the remora, and Octillery is based on the octopus, and that, in the real world, both of those have distinct taxonomies. But in Pokemon, Octillery is a mature form of Remoraid. I guess it could work in the same style of metamorphosis that lets caterpillars turn into butterflies and moths (which is what Pokemon "evolution" actually is: metamorphosis), but where does one put a remora that turns into an octopus into normal taxonomy? Given you split up the juvenile Carvanha from its mature form Sharpedo, you probably don't care, but from a taxonomy standpoint, and with metamorphosis in mind, that doesn't quite make sense.