Saichania • Saltasaurus • Saltopus • Sarcorixis • Sarcosaurus • Sarcosuchus Imperatosuchus ( Imperatosuchus 53) • Sarkastodon • Saurolophus • Sauropelta • Saurophaganax • Sauroposeidon • Saurornithoides • Saurornitholestes • Saurosuchus • Savannasaurus • Scaphognathus • Scaphotator • Scelidosaurus • Scipionyx • Sclerocephalus • Scolosaurus • Scorpios • Scutellosaurus • Scutomoceros • Scutophicyon • Scutosaurus • Secernosaurus • Secodontognathus • Secodontosaurus • Segisaurus • Segnoraptor • Segnosaurus • Segnosuchus • Segnotherisaurus • Sellosaurus • Shamosaurus • Shantungosaurus • Shastasaurus • Shonisaurus • Shringasaurus • Shunosaurus • Shuvosaurus • Shuvuuia • Siamosaurus • Siamotyrannus • Siats • Sigilmassasaurus • Simosuchus • Simurghia • Sino-Spino • Sinoceratops Ceramagnus • Sinokotaraptor • Sinornithoides • Sinornithosaurus • Sinosauropteryx • Sinosaurus • Sinraptor • Skoolasaurus • Skoonametrodon • Skoonasaurus • Skorpiovenator • Smilocephalosaurus • Smilodon • Smilonemys • Smithetoceras • Sonidosaurus • Sonorasaurus • Sphenacodon • Spinoconstrictor • Spinonyx • Spinoraptor • Spinosaurus • Spinotahraptor • Spinotasuchus • Staurikosaurus • Stegoceras • Stegoceratops • Stegodeus • Stegosaurus Stegosaurus lux • Stegospinus • Stegouros • Stiltotops • Stokesosaurus • Struthiomimus • Struthiosaurus • Stygi • Stygidaryx • Stygimoloch • Styracosaurus Styracosaurus lux • Styxosaurus • Subhyracodon • Suchodus • Suchomimus • Suchoripterus • Suchotator • Supersaurus • Suprannotitan • Suzhousaurus • Symmachosophus • Synthetoceras • Szechuanosaurus In one of the charts of the Scorpios rex seen in Season 1 says it has a Spinosaurus skull, despite it not having it at all, let alone, not having any Spinosaurus DNA.

The Scorpios rex's design and some of its poses are reminiscent to the human-dinosaur hybrids that were going to be in Jurassic Park IV, but the idea was scrapped. The Scorpius rex displays remarkable prowess in climbing, showcasing its capacity to effortlessly ascend trees and climb structures within the boundaries of Jurassic Park. The avoidance of the Scorpios rex by other carnivores, like Rexy, might be attributed to the presence of hyper-aggressive behavior displayed by the Scorpios rex, causing a wariness among the other carnivores.Against common belief, the Scorpios rex is not named after the Skorpiovenator or any kind of scorpion at all. Its quills and name come from the scorpionfish. The Scorpios rex is the first hybrid dinosaur shown to reproduce and also the first ever dinosaur to be shown to reproduce asexually. Multiple sources (such as the novels and executive producers) confirmed that the Scorpios rex is spelled with an "o" and not a "u", because Scorpios is Latin for "scorpion" (although Scorpius is an alternative of the same word in the same language). Regardless, it's officially Scorpios rex, not Scorpius rex. The Scorpios rex is the only Doctor Wu hybrid in the franchise who isn’t known to have killed a human, although it has killed the most dinosaurs.

A Compsognathus ripped through a cable which contributed to keeping the Scorpios rex frozen, allowing the hybrid to break free and roam the island.Maaradactylus • Macrauchenia • Macropoma • Magnapyritor • Magnosaurus • Magyarosaurus • Maiasaura • Majundaboa • Majundasuchus • Majungasaurus • Maleevus • Malusaurus • Mamenchisaurus • Mammolania • Mammotherium • Mammut • Mammuthus • Mantellisaurus • Marasuchus • Marshosaurus • Masiakasaurus • Massospondylus • Mastodonsaurus • Mauisaurus • Megacerops • Megalania/Varanus • Megaloceros Maelstrom 08 • Megalogaia • Megalonyx • Megalosaurus • Megalosuchus • Megalotops • Meganeura • Megapnosaurus • Megaraptor • Megarchelon • Megatherium • Megazostrodon • Megistocurus • Megistotherium • Meiolania • Mesolimulus • Mesonychoteuthis • Mesonyx • Mesosaurus • Metoposaurus • Metriacanthosaurus • Metrialong • Metriaphodon • Metriorhynchus • Microceratus • Micropachycephalosaurus • Microposaurus Salamander 16 • Microraptor • Microvenator • Minmi • Miragaia • Mixosaurus • Moeritherium • Mongolemys • Monoclonius • Monolocevia • Monolometrodon • Monolophosaurus • Monolorhino • Monomimus • Mononykus • Monostegotops • Montanoceratops • Moropus • Moros • Mosasaurus • Moschops • Mussaurus • Muttaburrasaurus • Mylodon • Mymoorapelta