Which of the #Dinosaurs is Your Favorite #Dinosaur? (what epoch & period etc.?)

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'That word' (below-hyperlinked to a list of about 30 dinosaurs) is built on an even-deeper source ... something crucial that firms the foundation upon which our lexicon stands ...
The word “Dinosaur” is built on ancient words that mean “|Terrible (|Dire) + Lizard (-|saurus)” (with #GoneTheWayOfTheDinosaur becoming slang for "Person- or Institution 'Going Extinct' by Not Adapting to Change," thus making 'Dinosaur' a slang-insult for 'an Old Person or Machine, stuck in Old Ways').
The diagram (which I had to go to the Wikipedia-page and zoom THERE to clearly see all the text-of) classifies the dinosaurs this way (although I'm probably getting some of 'the semantics of this vocabulary' wrong):

  1. in the Middle (epoch) Triassic (period), the Archosaurs split into
  2. Saurischia (Lizard-Hipped)
    1. the Sauropodomorpha happened at the end of the Middle Triassic
      1. the species that developed were the Prosauropoda (which went extinct in the Early Jurassic) & the Sauropoda - gone extinct in the event at the start of the Paleocene Paleogenic
    2. the Theropoda
      1. the beginning of the Late Triassic saw the birth of the Herrerisauridae, which went extinct in the Early Jurassic
      2. the end of the Late Triassic saw the remaining Saurichia split into Ceratosauria (gone extinct in the event at the start of the Paleocene Paleogenic) & Tetanurse, which in the Early Jurassic and split into the
        1. Allosaurodea, which went extinct in the Late Cretaceous period
        2. Maniraptora, which–also in the Early Jurassic–split into the
          1. Deinychosauria - gone extinct in the event at the start of the Paleocene Paleogenic
          2. Birds, the only species of the Dinomorph that survived through the Paleocene Paleogenic period ... and yes, I double-checked; 'Birds' evolved from the 'Lizard-hipped' dinosaurs (& not their 'bird-hipped' cousins)
  3. & Ornisthischia (Bird-Hipped)
    1. Heterodontosauridae - specie that-split off from the Genasauria in the Late Triassic & -went extinct in the Early Cretaceous
    2. Thyreophora - Genasauric species that split off from the Cerapoda later in the Late Triassic
      1. Stegosauria - specie that went extinct in the Late Cretaceous
      2. Ankylosauria - gone extinct in the event at the start of the Paleocene Paleogenic
    3. Ornithopoda - a group consisting 'only' of the
      1. Euornithopoda - gone extinct in the event at the start of the Paleocene Paleogenic
    4. Marginocephalia
      1. Pachycephalosauria - gone extinct in the event at the start of the Paleocene Paleogenic
      2. Ceratopia (e.g. Triceratops) - gone extinct in the event at the start of the Paleocene Paleogenic

The link above the picture lists the:


Or am I looking at that wrong (or 'wrongly' 🤓)? Tell
 me how-wrong/right I am in the comments below 😁

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