First of all, I must repeat that I am not back, I just don't have anywhere else to put this. Second, Fandom's editor is complete garbage and I made a good decision bailing out on being here full time.
This list is adapted from an attempt at making sense of the phylogeny of most of the creatures featured in The Land Before Time series with a decidedly flawed character matrix; some of the classifications and placements of animals here here are so zany that they make parts of the Fantastic Edition look positively parsimonious, so be warned. I must also get the fact that this is by no means to be taken seriously out of the way before someone riots, please for the love of Littlefoot's mother don't treat this as scientifically accurate.
Anyway, on with the madness. From the top:
6/24/2021: The addition of a few small background creatures and the expansion of a few characters has dramatically shaken up the tree.
7/5/2021: Dedicedly huge changes, the biggest ones being the addition of several LBT1 nothing lizards and, most pertinently, a shift in how the tree quantifies dinosaurs and non-dinosaurs.
Non-dinosaurs
"Platyreptilia"
By happenstance, all of the reptiles that fall under this umbrella are heavyset, broad creatures.
Pseudosuchia
Testudines
Sitting by itself on the ladder between platyreptiles and mammals:
Mammalia
Barring one odd inclusion, surprisingly solid, even with the joke taxon I threw in.
Pterosaurs
This iteration of the tree is unique from the ones preceding it in that, more likely than not as a side effect of its reshuffling of how it handles pubic conditions, Pterosauria has fallen into shambles and has more or less ceased to exist. What is described here is a ladder leading from a group of exactly three pterosaurs that was recovered up to a group containing all of the marine reptiles.
"Hydroreptilia"
The last stop before Dinosauria; all four taxa included in this group live in the ocean.
Dinosauria
Though things are definitely not the same as they were, Dinosauria still retains the same extremely basic Phytodinosauria/not Phytodinosauria divide that the previous revision had. Phytodinosauria, especially in more derived groups, is generally made up of very large, plantigrade, four-fingered quadrupeds with unwaveringly herbivorous dietary tendancies, while Theropoda is primarily digitigrade, three-fingered and very varied in terms of diet and size.
That said, there are two dinosaurs at the base of Dinosauria:
Phytodinosauria
Though still portraying a transition from heavy, armored brutes to majestic, long-necked titans, hadrosaurs and a basal ornithischian have decided to be alongside other ornithischians (and saurischian sauropods) for once. Ornithoscelida is dead, baybee.
Clypeodonta
Defined as "Hypsilophodon foxii, Edmontosaurus regalis, their most recent common ancestor, and all of its descendants," Clypeodonta is awkwardly wedged between Lambeosaurus and the thyreophorans on the ladder leading to Sauropoda.
Thyreophora
This tree, consistent with last time, interprets Thyreophora as a ladder leading to a crown group encompassing Nodosaurus and Rooter's species.
Complementing the fact that there used to be quite a bit of confusion between these two species on this wiki, Maiasaura and Iguanodon are both close relatives, both intermediary between thyreophorans and ceratopsians.
Ceratopsia
The Great Hideous Beast is still AWOL, but Mutt hasn't left yet.
Ceratopsidae
Centrosaurinae and Chasmosaurinae have effectively been shattered.
.webp "Chasmosaurus belli (The Land Before Time).webp (15 KB)")
Sauropoda
Sauropoda considers its downward spiral into gibberish. "Allosauropoda" and "Brachysauropoda", which are sister clades, are ladders leading to crown groups. Oddly, the main trait that distinguishes sauropods from other phytodinosaurs is that, with the exception of Hyp, they are the only ones that have lips.
Diplodocoidea
Though still messy, all of Sauropoda's common sense has been sucked up into this group.
"Allosauropoda"
Sauropoda's wastebasket; the only real trait separating them from brachysauropods is the fact that they aren't treated as diplodocoids and they have smooth faces.
"Brachysauropoda"
Characterized by short, wide heads and, generally, wrinkly faces.
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Theropoda
Though this is not quite Ornithoscelida as defined by Baron et al. 2017 - "the least inclusive clade that includes Passer domesticus and Triceratops horridus" - its scope is at the very least similar, as it encompasses both ornithopods and Theropoda - that said, the two groups are heavily mixed in this tree, and the tree interprets the group as a slow transition from docile herbivores to ravening carnivores.
These three taxa and intermediary forms between the aforementioned docile herbivores and ravening carnivores:
Theropoda
Whereas the previous iteration of this tree presented a warped rendition of the traditional coelurosaur/carnosaur divide, this iteration has its own strange view on theropod phylogeny.
"Nihilosauroidea"
The most primitive branch on the tree, several of the creatures in the "nothing reptile" superfamily have proven to be very hard to fit in the real-world theropod family tree, be as it centralized as Eudromaeosauria or as vast as the entire Theropoda clade.
Ornithomimidae
Instead of having derived from small, birdlike runners like in reality, the ornithomimids in this tree are dwarf descendants of large, perhaps spinosaur-like theropods.
Avialae
The clade Avialae is defined by most as "all theropods closer to birds than to Deinonychus." Due to the fact that, in this universe, Deinonychus is effectively a primitive spinosaur, this leaves several more derived sharpteeth in an awkward position of effectively being birds. Here, Avialae is split into two groups - the "proornithids", which includes birds and their closest relatives, and the "acutodonts", which are all bulky, ferocious predators.
"Proornithidae"
"Acutodontia"
Still closer to birds than to Deinonychus but barely recognizable as bird relatives; the sharpteeth in this group are among the most well-oiled killers in the dinosaur world.
Dromaeosauridae
Tyrannosauridae
With one small exception, tyrannosaurids are huge, imposing carnivores; the sharpteeth to end all sharpteeth.
This will be updated as more taxa are slowly added and more characters are added to the matrix. Keep an eye out for potential improvements and inevitable phylogenetic upsets.
Deliberate exclusions
