Zoans are the most ubiquitous of peoples within the Milky Firmament. On a universe-wide scope, their population is smaller only than that of the Stars.
Their diversity is great, but many generalizations can be made. Zoans are universally humanoid, with any healthy individual having 4 limbs on a headed body. With few exceptions, healthy zoans will have a pair of eyes. They all breath in oxygen or oxygenated water and out ashgas, through means of either lungs or gills, rarely both. Most have tails and some form of integument.
Zoans are separated into many classes, considering anatomical differences as well as reproductive compatibility. If two Zoans of separate classes mate, the embryo will probably be inviable and it will lead to a miscarriage. Each class corresponds to a taxonomical order of Animatea.
Ostracids are cold-blooded, armored fish-like zoans. Their heads and chests are naturally armored, and although toothless, they may have bony plates on their mouths, much like their wild counterparts. They give birth to live young and breath in water. They include forms like bothriolepis, dunkleosteus, asterosteus, ptycodon, phyllolepis and rolfosteus.
Ichthyids are cold-blooded, bony fish-like zoans. They tend to be covered in small overlapping scales and breath underwater. Exemples include anglerfish, sardine, xiphactinus, lionfish, stargazer, coelacanthus, billfish, blobfish, boxfish, salmon, tuna, sunfish, bawitius, bass, sea horse, clownfish, gar, electric eel, fangtooth and mahi mahi. They form by far the largest Zoan class in terms of diversity.
Selachids are warm-blooded Zoans resembling cartilaginous fish and other acanthodians. They breath underwater and have their skin covered in denticles. They include forms such as salmon shark, tiger shark, helicoprion, manta ray, sawfish, rabbitfish, basking shark and xenacanthus.
Herpetonids are similar to things such as lizards, snakes, salamanders and even frogs, as well as some "protorosaurs". Their skin can be smooth, rugose or covered in overlapping scales. It may also be moist. They all breath air and are cold-blooded, and some may be able to extract some oxygen from their skins. Examples are axolotl, diplocaulus, python, komodo dragon, rain frog, gecko, bull frog, bearded dragon, tanystropheus and tegu.
Saurids resemble non-theropod, non-pterosaur archosaurs and also chelonians. Their skin is leathery and might bear scutes or filaments. They average as the largest Zoan class. They breath air and often have intricate lungs. Argentinosaurus, crocodile, silesaurus, leatherback turtle, sauropelta, stegosaurus, triceratops, parasaurolophus, zalmoxes and stegoceras are some of their forms.
Ornithids are lightweight, mostly feathery Zoans. Some have teeth, but many also have beaks and even are toothless. A few are capable of flight. They all breath air and are hot-blooded. Examples are pidgeon, owl, concavenator, therizinosaurus, cockatiel, ceratosaurus, pteranodon, toucan, velociraptor, emu, duck, carnotaurus, t-rex and tapejara Zoans.
Theriids are hot-blooded, synapsid-like Zoans. They may bear fur over a smooth or leathery skin. Most also possess heterodont dentition. All breath air. Many of them, if female, are able to lactate, mostly by their nipples. Forms include rabbit, possum, gorgonops, caribou, boar, bat, cat, dog, macrauchenia, thrinaxodon, sloth, echidna, bandicoot, lisowicia, mole, borhyaena and tenrec.
All the Zoan classes are analogous to the orders in the Animatea superphylum. This makes it odd that there aren't any Ophid (Serpanae) and Cetid (Balaenanae) classes of Zoans. Some naturalists speculate that these 2 orders were invented by the Artisans after the creation of Zoan populations, or that there were Ophid and Cetid Zoans in the past, but that they're extinct or live in unknown parts of the world.