A brand new clade of posthumans, Septibranchiae (meaning "septated gills" in Latin for the fact that they resemble the gills of a shark), has been added to the website! Check it out here at its respective page, which is accessible via the posthumans page.
In addition, I've added a link to the website of an entity called Centre d'Etude et de Recherche sur la Bipédie Initiale, whose heterodox hypothesis, which states that humans and all other vertebrate life descend from humanoid aquatic ancestors, resembles the central premise of Anthropomundus. Indeed, C.M. Kosemen himself pointed out this similarity in a comment on the DeviantArt entry of "Improbonexizoon," the first iteration of the progenitor posthuman.