polychaete taxonomy is terrible because there are ten thousand species, and the way you tell them apart is mostly by checking if…
polychaete taxonomy is terrible because there are ten thousand species, and the way you tell them apart is mostly by checking if the gonopore is present on the thirteenth instead of the seventeenth segment (which narrows it down to only six thousand and a half species!), while acoel taxonomy is terrible because all of the relevant papers were published in 1850-1950, before any kind of genetic analysis, and amount to “yeah it’s a brown teardrop shaped worm, five millimeters long, either a new species or a synonym of six others, good luck out there :)”