No Chicxulub Speculative Evolution

No Chicxulub is a speculative evolution project that explores an alternate history where the Chicxulub asteroid impact, which is widely believed to have caused the mass extinction of the dinosaurs 66 million years ago, never occurred. This project envisions how life on Earth might have evolved differently in the absence of this catastrophic event. From the diverse megafauna of the Mesozoic to the intricate ecosystems of a world without the K-Pg extinction, we examine the profound implications of this single divergence point in Earth's history.

Fauna

Dinosauria

Saurischia
- Theropoda
  - Ceratosauria
    - Abelisauridae (EXTINCT)
    - Noasauridae (antsantsandrongo and extinct relatives) — Current Distribution: Madagascar
  - Tetanurae
    - Coelurosauria
      - Megaraptoridae (terror lizards, terror tuataras, etc.) — Current Distribution: globally
      - Tyrannosauroidea
        
        Tyrannosauridae (tyrants)* — Current Distribution: globally, except for Australia and Antarctica
      - Maniraptora
        
        Dromaeosauridae (shriekers, anglershriekers, ungeese) — Current Distribution: globally, except for Australia and Antarctica
        
        Hominisauridae (Upright Shrieker (Hominisaurus sapiens)) — Current Distribution: globally, except for Antarctica
        
        Crocodylosauridae (uncrocs, unalligators, ungharials, untomistomas) — Current Distribution: temperate to equatorial regions
        
        Troodontidae (slender shriekers, landolphins) — Current Distribution: globally, except for Australia and Antarctica
        
        Oviraptorosauria (robbers, thiefbirds) — Current Distribution: globally, except for Australia and Antarctica
        
        Ornithomimosauria
        
        Ornithomimidae (unostriches, unrheas, unmihirungs) — Current Distribution: globally, except for Antarctica
        
        Deinocheiridae (hunchbacks, ducksnouts) — Current Distribution: Holarctic
        
        Macroposauridae (tjakipiris) — Current Distribution: Australia
        
        Alvarezsauroidea (monkbirds, antlickers, etc.) — Current Distribution: globally, except for Antarctica
        
        Therizinosauria
        
        Therizinosauridae (slothbirds, bearclaws, etc.) — Current Distribution: globally, except for Antarctica
        
        Thanatosauridae (grim reapers) — Current Distribution: Australia
        
        Avialae (birds and close relatives) — Current Distribution: globally
    - Megalosauroidea
      - Spinosauridae (sobeks, sharkrocs, etc.) — Current Distribution: Europe, Asia, Africa, Laramidia, Appalachia
- Sauropoda
  - Macronaria (EXTINCT)
  - Diplodocoidea — Current Distribution: globally, except for Antarctica
    - Rebbachisauridae (vacuum dragons) — Current Distribution: Africa, Europe, Asia, Laramidia
    - Dicraeosauridae (spikenecks, shortnecks) — Current Distribution: Americas, Chukotka
    - Diplodocidae (loongs and behemoths) — Current Distribution: globally, except for Antarctica
      - Diplodocinae (loongs) — Current Distribution: globally, except for Antarctica
      - Behemothinae (behemoths) — Current Distribution: globally, except for Antarctica
      - Sauropophineinae (slaughterbeasts) — Current Distribution: globally, except for Antarctica
Ornithischia
- Thyreophora
  - Stegosauria
    - Stegosauridae (platers, shivvers) — Current Distribution: globally, except for Australia, South America and Antarctica
    - Stegosauropodidae (beamnecks) — Current Distribution: British Isles
  - Ankylosauria
    - Ankylosauridae juggernauts, crushers, smashers, Iceeater — Current Distribution: globally, except for Australia and Antarctica
    - Nodosauridae (shieldfrogs) — Current Distribution: globally, except for Australia and Antarctica
- Neornithischia
  - Hadrosauria
    - Acristata (bellowers, bogatyrs) — Current Distribution: globally, except for Australia and Antarctica
    - Cristofera (clarisones) — Current Distribution: globally, except for Australia and Antarctica
  - Marginocephalia
    - Ceratopsia (EXTINCT)
    - Pachycephalosauridae (shieldbangers, domehorns, thickheads) — Current Distribution: globally, except for Australia and Antarctica

Pterosauria (flappers)

Azhdarchia
- Kwankwanxwaligiformia
  - Kwankwanxwaligidae
    - Kwankwanxwaliginae (thunderflappers, flyrunners, wendigoes, flying giraffes) — Current Distribution: globally, except for Australia and Antarctica
    - Volatoailuropodimiminae (Flying Panda (Volatoailuropodimimus melanoleucus) and extinct relatives) — Current Distribution: globally, China
  - Hippogryphonidae
    - Hippogryphoninae (hippogryphs and extinct relatives) — Current Distribution: globally, except for Antarctica
    - Pegasipteryginae (pegasi and extinct relatives) — Current Distribution: globally, except for Australia and Antarctica
- Draconiformia
  - Draconidae (dragons)
  - Zmeiidae (Zmei Gorynych and extinct relatives) — Current Distribution: Europe, West Asia
- Huitzilopochtliformia
  - Huitzilopochtlidae (hummingflappers)
    - Huitzilopochtlinae (American hummingflappers) — Current Distribution: Americas
    - Dionysuspterinae (Eurasian hummingflappers) — Current Distribution: Eurasia
    - Jokatrochilinae (African hummingflappers) — Current Distribution: Africa
  - Vespertilliosauridae (nightflappers, fruitflappers, bloodsuckers, etc.) — Current Distribution: globally, except for Antarctica
Pteranodontia
- Diomedeasauridae (albatross-flappers, gullflappers, etc.) — Current Distribution: globally in oceans and coasts
- Pteropiscatricidae (fisherflappers, heronflappers) — Current Distribution: globally
- Volanobalaenidae (whaleflappers, flamingoflappers, skimmerflappers) — Current Distribution: globally

Mammalia

Monotremata
- Ornithorhynchidae (platypuses) — Current Distribution: Australia
- Echidnidae (echidnas) — Current Distribution: Old World, Australia
- Gryphoidea (griffins) — Current Distribution: globally
Theria
- Metatheria
  - Marsupialia
    - Dasyuridae (quolls, devilbeasts, thylacines, etc.) — Current Distribution: Australia
    - Didelphidae (opossums) — Current Distribution: Appalachia, South America, South Laramidia
    - Thylacoleonidae (marsupial lions) — Current Distribution: Old World, Australia
    - Phalangeridae (possums, cuscuses, etc.) — Current Distribution: Old World, Australia
    - Phascolarctidae (koalas, drop bears) — Current Distribution: Old World, Australia
    - Vombatidae (wombats) — Current Distribution: Australia
    - Microbiotheriidae (monitos del monte) — Current Distribution: South America
  - Sprassodonta
    - Maiptheriidae (terror beasts) — Current Distribution: Americas, Chukotka
    - WIP
- Eutheria
  - Protungulatum fictiungulatum (Unhorse) — Current Distribution: Americas, Asia
  - Volaticotheroides sharovipterygoides (Volatopus) — Current Distribution: Sri Lanka
  - Pantodonta
    - Eulambdidae (false sloths) — Current Distribution: Holarctic
  - Leptictida
    - Saltatotheriidae (womb wallabies, womb quokkas) — Current Distribution: Europe
  - Placentalia
    - Atlantogenata
      - Xenarthra (sloths, anteaters, armadillos, panzerbeasts) — Current Distribution: Americas, Chukotka
      - Afrotheria (aardvarks, mpihinambitsikas, aardpangolins, sengis) — Current Distribution: Old World
    - Boreoeutheria
      - Euarchontoglires (lagomorphs, primates) — Current Distribution: Eurasia, North America, Madagascar
      - Laurasiatheria (eulipotyphlans, falseals) — Current Distribution: globally

Testudines

Pseudosuchia (EXTINCT)

Lepidosauria

Sphenodontia (tuataras)
Squamata (lizards, snakes, amphisbaenians, etc.)

Lissamphibia

Sarcopterygii

Actinopterygii

Chondrichthyes

* - Alioramini is the only surviving tribe of the family Tyrannosauridae