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Description
Here is an in-depth look at the feathered dragons ans serpents. Though the living species are all in the single monophyletic group, the carnivorous Avidraconiforms to which Simurghs also belong, they are related to extinct species and close to the griffiniforms and avithereans.

Griffiniforms: discussed in detail here

Avithereans: discussed in detail here

Pansimurghimorphs: discussed in detail here

Hooded Wadjets: feathery winged serpentine creatures, lacking other lambs but sporting a hood of skin they can extend as a warning. They posses a neurotoxic venom.

Common Waqdjets: these close relatives of hooded wadjets share their neurotoxic venom,but lack their distinctive hoods.

Lesser Winged Serpents: these small, slender, ground-dwelling winged serpents lack venom glands.

Winged Vipers: these winged serpents have a hemotoxic venom that they inject through a pair of long, sharp fangs.

Titanoboa Quetzocoatls: the largest of the winged serpents, they are better swimmers than fliers. They lack venom and kill their prey by constricting their bodies around it. They have distinctive feathery frills.

Anaconda Quetzocoatls: large, terrestrial, constricting winged serpents.

Python Quetzocoatls: arboreal, constricting winged serpents.

Boa Quetzocoatls: smaller, mostly arboreal constricting winged serpents.

Common Winged Serpents: these primitive, arboreal, two-winged serpents lack venom glands.

Neshutans: four-winged relatives of more prototypical winged serpents have two pairs of wings.

Seraphic Serpents: six-winged relatives of both true winged serpents and neshutans. They are arboreal and rest with their tials coiled around tree branches.

Protoserphic Serpents: extinct relatives of seraphic serpents. They used all six limbes for flight, but retained functional grasping feet for climbing.

False Simurghs: arboreal, four-winged extinct dragon-like feathered species with prehansile tails.

Eoaerophidians: primitive, extinct relatives of false simurghs that used two pairs of limbs for flight, but retained functional hands and claws.

Protoaerophidians: extinct relatives of feathered dragonettes and eoaerophidians, they only used one pair of wings, but had highly flexible spines and prehensile tails.

Feathered Dragonettes: dragon-like feathered, climbers. They have long bodies and short faces.

Moose Piasas: the largest piasas, with the largest antlers.

Elk Piasas: smaller than moose piasas, but with comparatively larger antlers.

Deer Piasas: the smallest antlered piasas, they are related to moose piasas and elk piasas.

Bull Piasas: large piasas with long, smooth slightly upwards curved horns.

Bison Pisas: large, robust piasas with short, smooth upward curving horns.

Ram Piasas: piasas with thick, coiled horns.

Antelope Piasas: piasas with long, slender, backwards curved horns.

Goat Piasas: the most primitive of the horned piasas. They have short, rigged, slightly backwards-curved horns.

Pronghorn Piasas: the most primitive piasas, they have short, temporary horn-like head ornamentation.

Feathered Megadragons: similar to piasas, but lacking in the head ornamentation and possessing longer faces. They are in fact closely related to piasas.

Feathered Microdragons: though anatomically similar to feathered megadragons, and feathered dragonettes, they are not especially closely related to either of them. They are survivors of the most primitive group of feathered dragons.

Centrasaur Griffins: these extinct creatures had a single, prominent horn protruding form their nose and a round,bony frill coming out of the back of their head. In many ways their anatomies were reminiscent of griffins with their quadrupedal posture and sharp, curved beaks, however they were not closely related tothemat all and occupied very different ecological roles. Due to this though, they are known as false-griffins.

Albetraceratops Griffins: these false-griffins had a pair of long horns above the eyes, and a rounded frill.

Triceratops Griffins: these false-griffins had three long horns, one on the nose and two above the eyes and a round frill. They were closely related to centrasaur griffins and albertaceratops griffins.

Chasmosaur Griffins: these false griffins had tall almost rectangular frills, a short horn on the nose and a pair of short hors above the eyes. They are the most primitive clade of the horned false-griffins with non-ornamented frills.

Pahcyrinosaur Griffins: false-griffins, that had wide, blunt nasal horns and a pair of spikes ornamenting the top of their frills.

Spinops Griffins: false-griffins that had a single, forward-curved nasal horn and a pair of spikes on their frills. They were closely related to pachyrinosaur griffins.

Diaboliceretops Griffins: false-griffins that had two prominent horns above their eyes and pair of spikes on their frills.

Styracosaur Griffins: false-griffins with short horns, and multiple prominent spikes on their frill. They are related to the other griffins that have spiked frills and have the most basal anatomy of the group.

Protoceratops Griffins: more primitive false-griffins that have many of the prototypical anatomical features of the group. They lack horns.

Psiticasaurus Griffins: the most primitive of the false-griffins. They have a sharp curved beak, but lack a frill.

Parasarolophus Dragons: these extinct creatures had a long, hollow crest that extends like a single blunt horn out of the back of their head. They also had an anatomy that is seems to be both in some ways similar to, but also the opposite of what you might expect to see in a proper dragon. They are six-limbed winged quadrupeds, but whereas proper dragons are carnivores with membranous bat-like wings, these "pseudodragons" are herbivores with feathery bird-like wings.

Lambeasaur Dragons: these pseudodragons had a thin tall crest that leans slightly forward.

Corithosaur Dragons: these pseudodragons had a shorter, thin, curved crest that juts strait out of the top of their head. They were closely related to parasorolophus dragons and lambeasaur dragons. Together these groups make up the hadrisaur dragon clade.

Anatosaur Dragons: pseudodragons that lack a crest but have long,broad vaguely "duck-like" mouths full of grinding teeth.

Iguanadon Dragons: the most primitive of the proper pseudodragons, they lack the adaptations of the anatosaur dragons or handrasaur dragons.

Hipsolophidon Dragons: primitive relatives of both false-griffins and true pseudodragons, this group has a pseudodragon-like body-plan, but are smaller and more gracile than most proper pseudodragons.

Feather Protodragons: early ancestors to modern and extinct feathery-winged species. They were generalized omnivores.

Plumed Protodrakes: possessed proper feathers, but lacked fully developed wings.

Downy Protodrakes: the most primitive relative of the feathered species. They had plumed down-like body-covering, rather than singular hairs.

Here we finally get a better look at the relationship of all the various feathered species on this planet. The moral of this story seems to be that you can't let give me creatures that are overly-similar to dinosuars, as I will that that and run wild with it.

Description
Here is an in-depth look at the feathered dragons ans serpents. Though the living species are all in the single monophyletic group, the carnivorous Avidraconiforms to which Simurghs also belong, they are related to extinct species and close to the griffiniforms and avithereans.

Griffiniforms: discussed in detail here

Avithereans: discussed in detail here

Pansimurghimorphs: discussed in detail here

Hooded Wadjets: feathery winged serpentine creatures, lacking other lambs but sporting a hood of skin they can extend as a warning. They posses a neurotoxic venom.

Common Waqdjets: these close relatives of hooded wadjets share their neurotoxic venom,but lack their distinctive hoods.

Lesser Winged Serpents: these small, slender, ground-dwelling winged serpents lack venom glands.

Winged Vipers: these winged serpents have a hemotoxic venom that they inject through a pair of long, sharp fangs.

Titanoboa Quetzocoatls: the largest of the winged serpents, they are better swimmers than fliers. They lack venom and kill their prey by constricting their bodies around it. They have distinctive feathery frills.

Anaconda Quetzocoatls: large, terrestrial, constricting winged serpents.

Python Quetzocoatls: arboreal, constricting winged serpents.

Boa Quetzocoatls: smaller, mostly arboreal constricting winged serpents.

Common Winged Serpents: these primitive, arboreal, two-winged serpents lack venom glands.

Neshutans: four-winged relatives of more prototypical winged serpents have two pairs of wings.

Seraphic Serpents: six-winged relatives of both true winged serpents and neshutans. They are arboreal and rest with their tials coiled around tree branches.

Protoserphic Serpents: extinct relatives of seraphic serpents. They used all six limbes for flight, but retained functional grasping feet for climbing.

False Simurghs: arboreal, four-winged extinct dragon-like feathered species with prehansile tails.

Eoaerophidians: primitive, extinct relatives of false simurghs that used two pairs of limbs for flight, but retained functional hands and claws.

Protoaerophidians: extinct relatives of feathered dragonettes and eoaerophidians, they only used one pair of wings, but had highly flexible spines and prehensile tails.

Feathered Dragonettes: dragon-like feathered, climbers. They have long bodies and short faces.

Moose Piasas: the largest piasas, with the largest antlers.

Elk Piasas: smaller than moose piasas, but with comparatively larger antlers.

Deer Piasas: the smallest antlered piasas, they are related to moose piasas and elk piasas.

Bull Piasas: large piasas with long, smooth slightly upwards curved horns.

Bison Pisas: large, robust piasas with short, smooth upward curving horns.

Ram Piasas: piasas with thick, coiled horns.

Antelope Piasas: piasas with long, slender, backwards curved horns.

Goat Piasas: the most primitive of the horned piasas. They have short, rigged, slightly backwards-curved horns.

Pronghorn Piasas: the most primitive piasas, they have short, temporary horn-like head ornamentation.

Feathered Megadragons: similar to piasas, but lacking in the head ornamentation and possessing longer faces. They are in fact closely related to piasas.

Feathered Microdragons: though anatomically similar to feathered megadragons, and feathered dragonettes, they are not especially closely related to either of them. They are survivors of the most primitive group of feathered dragons.

Centrasaur Griffins: these extinct creatures had a single, prominent horn protruding form their nose and a round,bony frill coming out of the back of their head. In many ways their anatomies were reminiscent of griffins with their quadrupedal posture and sharp, curved beaks, however they were not closely related tothemat all and occupied very different ecological roles. Due to this though, they are known as false-griffins.

Albetraceratops Griffins: these false-griffins had a pair of long horns above the eyes, and a rounded frill.

Triceratops Griffins: these false-griffins had three long horns, one on the nose and two above the eyes and a round frill. They were closely related to centrasaur griffins and albertaceratops griffins.

Chasmosaur Griffins: these false griffins had tall almost rectangular frills, a short horn on the nose and a pair of short hors above the eyes. They are the most primitive clade of the horned false-griffins with non-ornamented frills.

Pahcyrinosaur Griffins: false-griffins, that had wide, blunt nasal horns and a pair of spikes ornamenting the top of their frills.

Spinops Griffins: false-griffins that had a single, forward-curved nasal horn and a pair of spikes on their frills. They were closely related to pachyrinosaur griffins.

Diaboliceretops Griffins: false-griffins that had two prominent horns above their eyes and pair of spikes on their frills.

Styracosaur Griffins: false-griffins with short horns, and multiple prominent spikes on their frill. They are related to the other griffins that have spiked frills and have the most basal anatomy of the group.

Protoceratops Griffins: more primitive false-griffins that have many of the prototypical anatomical features of the group. They lack horns.

Psiticasaurus Griffins: the most primitive of the false-griffins. They have a sharp curved beak, but lack a frill.

Parasarolophus Dragons: these extinct creatures had a long, hollow crest that extends like a single blunt horn out of the back of their head. They also had an anatomy that is seems to be both in some ways similar to, but also the opposite of what you might expect to see in a proper dragon. They are six-limbed winged quadrupeds, but whereas proper dragons are carnivores with membranous bat-like wings, these "pseudodragons" are herbivores with feathery bird-like wings.

Lambeasaur Dragons: these pseudodragons had a thin tall crest that leans slightly forward.

Corithosaur Dragons: these pseudodragons had a shorter, thin, curved crest that juts strait out of the top of their head. They were closely related to parasorolophus dragons and lambeasaur dragons. Together these groups make up the hadrisaur dragon clade.

Anatosaur Dragons: pseudodragons that lack a crest but have long,broad vaguely "duck-like" mouths full of grinding teeth.

Iguanadon Dragons: the most primitive of the proper pseudodragons, they lack the adaptations of the anatosaur dragons or handrasaur dragons.

Hipsolophidon Dragons: primitive relatives of both false-griffins and true pseudodragons, this group has a pseudodragon-like body-plan, but are smaller and more gracile than most proper pseudodragons.

Feather Protodragons: early ancestors to modern and extinct feathery-winged species. They were generalized omnivores.

Plumed Protodrakes: possessed proper feathers, but lacked fully developed wings.

Downy Protodrakes: the most primitive relative of the feathered species. They had plumed down-like body-covering, rather than singular hairs.

Here we finally get a better look at the relationship of all the various feathered species on this planet. The moral of this story seems to be that you can't let give me creatures that are overly-similar to dinosuars, as I will that that and run wild with it.