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HTTYD Taxonomy (Revised), This project will attempt to classify the…

- - - - Silkspanner (Araneodrakon inflatovolans)
    - - Cavern Crasher (Suchurodelis ursinus)
  - - - Wyrmiformes, characterised by having a more elongate body plan with more cervical vertebrae than most other Dragons. The ancestors of hexapod dragons probably looked something like these.
        
        Unipteridae
        
        Thunderpede (Brontopus rufus)
        
        Hackatoo (Asciops bipennorhinus)
        
        Fireworm (Luminowyrm luminaris)
        
        Quadipteridae, the most derived of the Wyrm-form dragons, having a lifestyle/ecology similar to those of hexapod dragons.
        
        Singetail (Quadipterus infernum)
      - Hexapoda, the so-called "True Dragons" (although in my personal opinion, the distingushment from "true dragons" and "non-dragon" dragons is arbitrary), and are classified by having 6 limbs (pelvic, cervical and pectoral) which are all used for various purposes, unlike in the Wyverniformes, which have their pectoral limbs either atrophied or lost.
        
        Polycephala, "many heads". At some point in their evolution, basal Hexapod dragons experienced a mutation called Dicephaly that caused multiple heads to grow from one body. Normally this mutation is a death sentence, but through favourable conditions in their prehistory, this was a mutation that seemed to be selected for, and gradually the Polycephalans emerged (although their earliest ancestors still only had one head). Today, members of the Polycephala are unique for having adaptations suitable for carrying multiple heads on one body.
        
        Phytohydridae
        
        Snaptrapper (Phytohydra muscipula)
        
        Dicephalodraconoidea
        
        Dicephalodraconidae
        
        Hideous Zippleback (Dicephalodrakon moschatus)
        
        Tetanocephalidae, "Stiff Heads", which probably evolved from an ancestor similar to the zippleback, but gained aquatic adaptations and eventually became a marine species of multi-headed Dragon.
        
        Seashocker (Tetanocephalus brontothalassus)
        
        Tipidraconia, "typical dragons" or "average dragons". Some also call these the "true" true dragons.
        
        Felidraconia, characterised largely by their intelligence, large eye sockets, relatively flat faces, and feline mannerisms.
        
        Tetrapteridae, which at some point in their evolutionary history, developed a second pair of wings, likely to provide additional stability during flight.
        
        Stormcutter (Tetrapteryx tytooides)
        
        Adonovenatoridae, meaning "Toothless Hunters"
        
        Woolly Howl (Venatorotherium moschatus)
        
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        Peltosauria, the "Armoured Lizards". They are mainly distinguished from other Tipidraconians by the development of bony armour (Osteoderms). While other Dragon lineages do possess some osteoderm coverage, the Peltosaurians have this feature almost universally.
        
        Dracochoeroidea, the Gronckle-like Dragons, including the lineage that leads to the Gronckle itself.
        
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        Anuroididae, very basal Dracochoeroids.
        
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        Arthroptera, the "jointed wings". This is kind of a misnomer, as these dragons don't actually have arthropod-like joints, but rather very derived osteoderm armour that resembles the exoskeletons of arthropods.
        
        Mantocheiridae
        
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        Pyrodraconia, the typical "Fire Dragons" even though that name is a little bit of a misnomer
        
        Draconidae, the the traditional "Western Dragon" family.
        
        Dracovaraninae, basal Draconids that later diversified to fill squamate niches in the colder temperate & boreal climates
        
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        Draconinae
        
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        Delphinidraconinae
        
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    - - Maniwyverna, the "Armed/Hand Wyverns". These are members of the Wyverniformes that have not entirely lost function in their pectoral limbs, but are more closely related to the armless/vestigial Wyverns than they are to the Hexapods. The earliest members of the Wyverniformes were all quadrupedal, but later evolved bipedalism independently. This is also why some of them are still quadrupedal and resemble Hexapods more than other Wyverns.
        
        Pyrocetiformes
        
        Pyrocetidae
        
        Scauldron (Pyrocetus leviatanicus). Its ancestor was probably bipedal and looked similar to the raincutter, but as the Scauldron grew in bulk, it's likely that it re-evolved quadrupedalism to cope with its semi-aquatic lifestyle and heavier body.
        
        Raincutter (Propyrocetus macrops)
        
        Smilorhynchidae
        
        Razorwhip (Smilorhynchus mirabilis). Instead of bipedalism, the Razorwhip seems to have doubled-down on its quadrupedal lifestyle, being convergent with Hexapods.
        
        Pseudowyverna
        
        Lucernopidae
        
        Snifflehuncher (Lucernops lucernops), probably what the ancestors of all Pseudowyverns looked like, being quadrupedal, deep-faced, and having prominent nasal horns.
        
        Ophiornithidae
        
        Argentophoneiinae
        
        Slithersong (Argentophoneus argentum)
        
        Death Song (Argentophoneus aureum)
        
        Songwing (Argentophoneus (Athorax) gigaptera), convergently evolved a similar body plan to Amphipteres, hence the subgenus name "Athorax" meaning "Bodyless"
        
        Ophiornithinae
        
        Ornithocaprini
        
        Prickleboggle (Ornithocapra giganteum)
        
        Ophiornini
        
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        Lophothornini
        
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      - Wyvernimorpha
        
        Tyrannowyverna
        
        Tyrannowyvernidae
        
        Windgnasher (Ankylophus pachycephalus), convergent with Gronckles, having a coat of thick osteoderm armour, but still technically a Tyrannowyvernid.
        
        Shovelhelm (Latirhinops robustus)
        
        Thunderclaw (Tyrannowyvern rex)
        
        Polar Thunderclaw (Tyrannowyvern boreas)
        
        Ceratotitanidae
        
        Snafflefang (Triceratitan baryouros)
        
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        Mudraker (Ceratotitan interfluvialis)
        
        Psittacoraptoridae
        
        Dramillion (Psittacoraptor triceras)
        
        Euwyverna, the "True Wyverns", having lost their pectoral limbs, and replaced them with their cervical limbs (the wings).
        
        Geowyvernidae, the "Stone Wyverns"
        
        Snow Wraith (Cryovenator atrox)
        
        Sentinel (Geowyvern animaterra)
        
        Eruptodon (Eruptodon volcanidens), only member of the Euwyverna that has retained vestigial pectoral limbs
        
        Dracoraptora, also what I call the "Bird Wyverns" or "Dinosaur-like Wyverns"
        
        Dracoraptoridae
        
        Speed Stinger (Dracoraptor ferox)
        
        Wyvernoidea
        
        Carnaviidae
        
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        Wyvernidae
        
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        Amphipterida, having lost their pelvic limbs and instead just having two front (cervical) limbs instead, giving them a snake-like body.
        
        Amphipteridae
        
        Slitherwing (Amphipterus serpentimimus)
        
        Gyrodontidae
        
        Whispering Death (Gyrodon spelaeus)
        
        Screaming Death (Gyrodon dirus)