List of species: Mesquite Edition

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:

Non-dinosaurs

Hopper (the most primitive organism)

Ichthyostega (forms a small paraphyletic group alongside Eryops and Dimetrodon, situated between the turtles and marine reptiles)

Eryops

Dimetrodon

Turtles

Archelon (the basalmost turtle)

Shellback (shellbacks and the giant snapping turtle from the first movie are sister taxa)

Snapping turtle

Marine reptiles

Surprisingly, all reptiles that have an affinity for water - barring Archie - form a unified clade on the tree.

Deinosuchus (it and the post-art shift bellydraggers are sister taxa; both sit at the base of the marine reptile group)

Bellydragger (X/TV series)

Elasmosaurus (the most basal of the non-crocodilian marine reptiles)

Sharptooth swimmer

Ophthalmosaurus (it and Mosasaurus stand as the most derived marine reptiles)

IV mosasaur

Mammals

Oddly enough, the closest group on the tree to the dinosaurs. A couple stabs at the tree have recovered them as primitive sauropods for some reason.

Tickly-fuzzy

Ceratogaulus

Dinosauria

Well, roughly; this isn't quite Dinosauria as most would recognize it.

Sauropoda

Sauropoda only narrowly escapes from exclusion from Dinosauria owing to Baron et al.'s redefinition of Dinosauria to include Diplodocus (before then, Dinosauria = the clade including the last common ancestor of Megalosaurus and Iguanodon). Of all of the dinosaur groups spat out by this tree, the sauropod group is effortlessly the least eyebrow-raising.

Brachiosauridae

Ultrasauros

Brachiosaurus

Diplodocidae

Surprisingly, the rough Diplodocidae recovered by the tree has simple versions of Diplodocinae (Diplodocus + Supersaurus and Apatosaurinae (Apatosaurus + Tinysaurus).

Diplodocus

Supersaurus

Apatosaurus

Tinysaurus

"Parathyreophora"

Though this group does include proper thyreophorans, some of the more basal members of this group are decidedly off-kilter.

Styracosaurus (a stem-"parathyreophoran" and sister taxon to Chasmosaurus - inexplicably in a totally different clade from the other two ceratopsids)

Chasmosaurus (just as lost as its sister taxon, Styracosaurus)

Iguanodon (on a different branch from the wayward ceratopsids; a stem-thyreophoran)

Thyreophora

This tree interprets Thyreophora as a ladder leading to a simple Ankylosauridae (Ankylosaurus + Rooter's species).

Nodosaurus (the basalmost thyreophoran, inexplicably more primitive than either of the stegosaurs)

Kentrosaurus

Stegosaurus

Ankylosaurus (the most derived thyreophoran alongside Rooter's species)

Rooter's species

Ceratopsidae

Contains a whopping two actual ceratopsids.

Maiasaura (the basalmost ceratopsid)

Triceratops (the sister taxon to Pachyrhinosaurus)

Pachyrhinosaurus

Mutt

Awkwardly wedged between Ceratopsidae and Theropoda on the tree; brace yourselves, things are about to get wacky.

Muttaburrasaurus

Theropoda

In the context of this tree, Theropoda is the largest group within Dinosauria, though this is in part because it is a much, much more inclusive group than it is in reality. It is split into two main groups, both of which have been given names of historic relevance: members of Coelurosauria tend to be relatively small and gracile, while members of Paracarnosauria tend to be large and robust. Both groups have several outliers, of course, and some of the relations recovered for these groups are, for the lack of a better word, insane. The last common ancestor of the two groups was likely similar to a Camptosaurus or very large Dryosaurus.

Coelurosauria

Domehead (the basalmost coelurosaurs; what were you expecting, something like an Ornitholestes?)

Tree ornithopod (on the right - the sister taxon to the little ornithopods from IV)

IV ornithopods (ignore the giant tyrannosaur, more on its affinities further down - their distinctive claws will be standard in most later coelurosaurs)

Great Hideous Beast (another lost member of Ceratopsia, in this case one that isn't a ceratopsid; a stem-"eucoelurosaur")

"Eucoelurosauria"

Coelurosaurs that are actually coelurosaurs, with some very, very big exceptions down the line. Feathers are a trait unique to Eucoelurosauria.

Nothronychus (at the root of a small clade it shares with Beipiaosaurus and Oviraptor)

Oviraptor

Beipiaosaurus (surprisingly, closer to Oviraptor than Nothronychus)

Diggers (more derived than "Pseudoabelisauridae", effectively a stem-parapterosaur - once again, brace yourself)

"Pseudoabelisauridae"

Of all of the coelurosaurs, these are the only terrestrial members of the group to fall under the sharptooth umbrella; certain members of this group have lost all their feathers and developed crocodilian osteoderms.

Quilled fastbiters (whereas all other dromaeosaurs have jumped ship to "Paracarnosauria", the quilled variety has stayed behind as a basal wannabe abelisaur)

Featherhead sharpteeth (neither Allosaurus nor Yutyrannus, but fluffy, crested cousins of Carnotaurus - who knew?)

Plated sharptooth (for as volatile as the tree has been, Plates being the sister taxon to JotB's Carnotaurus has been consistent throughout its development)

Carnotaurus

"Parapterosauria"

Nestled deep within Coelurosauria are birds and, of all things, pterosaurs - united by an ancestor with wings, a beak, a reduced tail, adaptations for aerial living and a long, delicate skull.

Eumaniraptora

Despite its lack of non-Microraptor dromaeosaurs, this small group is about as sane as Coelurosauria gets, in direct contrast to the fact that its sister group is made up of animals that straight up aren't dinosaurs.

Microraptor (the basalmost "bird")

Feathery green bird/pterosaur thing (intermediary between Guido and the two other "birds")

Golden post-art shift birds (they and Ichthyornis form Eumaniraptora's crown group)

Ichthyornis

Pterosauria

In the context of this tree, calling pterosaurs dinosaurs isn't actually inaccurate; in fact, they're extremely derived theropods, and the sister group to proper birds.

Pteranodon/Ctenochasma (it and the giant flyer from VII form a small group at the base of Pterosauria)

Giant flyer

Dimorphodon (sister taxon to Rhamphorhynchus)

Rhamphorhynchus (sister taxon to Dimorphodon)

Sharptooth flyers (sister taxon to Cearadactylus)

Cearadactylus (sister taxon to the V pterosaurs)

"Paracarnosauria"

Rest assured, "Paracarnosauria" is no less bonkers than Coelurosauria. The main trait that distinguishes paracarnosaurs and coelurosaurs is the presence of a dorsal ridge; while there are no coelurosaurs with proper ridges on their backs, there are far more paracarnosaurs with them than ones without, and a couple have full-on sails on their backs.

Clypeodonta

Defined as "Hypsilophodon foxii, Edmontosaurus regalis, their most recent common ancestor, and all of its descendants," Clypeodonta inexplicably sits at the base of Paracarnosauria.

Fat-nosed swimmer (the most basal of a small clade it shares with Hyp and Ducky's species; apparently Hyp is a bigmouth)

Hypsilophodon (the sister taxon to Ducky's species, solely because they both have rolls of fat around their necks)

Ducky's species (wow! This has done absolutely nothing to clear up what Ducky is supposed to be!)

Hadrosauriformes

The structure of Hadrosauridae had been shattered by this tree, if it wasn't already made clear by Maiasaura being a ceratopsid and the two bigmouths being closer to Hypsilophodon than anything else - even the tree's near-recovery of Lambeosaurinae, this very group, is thrown off by the mixing in of an indeterminate ornithopod (Edmontosaurus?) and Ouranosaurus!

Corythosaurus (the bottom bar of the ladder leading to the Parasaurolophus + purple ornithopod crown group)

Lambeosaurus (a step above Corythosaurus)

Ouranosaurus (a step below the crown group, and the reason this is Hadrosauriformes and not Euhadrosauria)

Parasaurolophus (the sister taxon to... that... purple thing)

Slim swimmer (the sister taxon to Parasaurolophus for some reason)

Carnosauria

With two exceptions, one of which is positively mind-boggling, everything here is a theropod - few are actually carnosaurs in the real-world cladistic sense, but still.

Pachycephalosaurus (the basalmost carnosaurs, beautifully exemplifying the tree's idea that all dinosaurian sharpteeth are descended from herbivorous ornithischians - interestingly, the tree doesn't have a solid answer for whether they are carnivores or herbivores)

Bulky fastbiters (the sister taxon to the 'III raptors; they share a spot on the tree between the crownheads and the huge sharpteeth)

Velociraptor (the sister taxon to the bulky TLJ raptors)

"Nihilosauridae"

These three theropods are united by the fact that they have long skulls ; two of these taxa are united by being hard to classify, which isn't something in the character matrix. This group has been shifted in position constantly; some of the trees prior to this revision recovered them as everything from basal tyrannosaurs to basal general theropods)

"Nothingosaurus" (the most primitive of the giant carnosaurs, and the most basal of the three nihilosaurs)

Compsognathus (the sister taxon to Deinonychus)

Deinonychus (the sister taxon to Compsognathus)

Tyrannosauridae

With one small exception, tyrannosaurids are huge, imposing carnivores; the sharpteeth to end all sharpteeth.

II prosauropod (the basalmost tyrannosaurid - you may have a stroke now)

Allosaurus (the basalmost tyrannosaurid to actually resemble a tyrannosaur; a couple tree recoveries place it closer to pre-art shift Tyrannosaurus than Red Claw)

Red Claw (more derived than Allosaurus; catalogued traits that set him apart from classic rexes and the "varmints" are his relatively small size, his relatively smooth face and his lack of excessive neck fat)

Varmints (the sister taxon to Sharptooth-variety Tyrannosaurus; their placement between that breed and Red Claw places them within Tyrannosaurus rex)

Pre-art shift Tyrannosaurus

"Alabrosauridae"

The sister group to Tyrannosauridae; the main trait that distinguishes this group from Tyrannosauridae is the fact that its members do not possess lips. More derived members of the group have keratinous beaks. Some trees recover the ornithomimids/"ornithomimines" as members of Coelurosauria, often as eumaniraptors that are close relatives ofIchthyornis.

XIII sharpteeth (they, along with their sister taxon, Spinosaurus, sit at the base of the group)

Spinosaurus (the sister taxon to the XIII sharpteeth)

Ornithomimus (the basalmost "ornithomimine", distinguished from Struthiomimus and the other three ornithomimines by a dorsal ridge)

Struthiomimus

Rainbowfaces (the sister taxon to Hidden Runner; of the members of Ornithomiminae, they are the only ones to possess sharp teeth)

Hidden Runner (recovered in the tree referenced here as the sister taxon to the rainbowfaces; other trees recover them as Struthiomimus or Ornithomimus relatives)

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.