User blog comment:BannedLagiacrus/Temnoceran Discussion/@comment-27125903-20161112070016/@comment-5167887-20161114140913

Well if we want to be reaaaally firm about monster classification, all Carapaceons, Neopterons and Temnocerans would be classed into a single slot. The Insect class.

They all have 6 legs and a segmented body.

However

Neopteron are just plain giant insects. (the size of a man or taller)

Temnocerans can extend their mouthparts.

Carapaceons had their front legs evolve into pincers, but that still makes 6.