I think a Permian Species Pack could be a nice idea bring more non dinosaur species into the game. Personally, the species I would pick for this pack are:
1: Either
Inostrancevia, An extinct genus of large carnivorous therapsids who lived during the Late Permian in what is now European Russia and South Africa. The first known fossils of this gorgonopsian were discovered in the Northern Dvina, where two almost complete skeletons were exhumed. Inostrancevia is the biggest known gorgonopsian, the largest fossil specimens indicating an estimated size between 3 and 3.5 meters (9.8-11 feet) long.
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2:
Scutosaurus, An extinct genus of pareiasaur parareptiles. Its genus name, which means shield lizard, refers to large plates of armor scattered across its body. Fossils have been found in the Sokolki Assemblage Zone of the Malokinelskaya Formation in European Russia, close to the Ural Mountains, dating to the late Permian (Lopingian) between 264 and 252 million years ago. It grew to be about 2.5–3 meters (8 – 9 feet) in length and weighing up to 1,160 kilograms (2,560 lb.).
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3: Either
Edaphosaurus, A genus of extinct edaphosaurid synapsids that lived in what is now North America and Europe around 303.4 to 272.5 million years ago,[1] during the Late Carboniferous to Early Permian. Edaphosaurus is important as one of the earliest-known, large, plant-eating (herbivorous), amniote tetrapods (four-legged land-living vertebrates). It grew to be around 0.5 to 3.5 meters (1.6 to 11.5 ft.) in length and weighed over 300 kilograms (660 lb.). Its genus name means pavement lizard, a reference to the "dental pavement" on both the upper and lower jaws, which is derived from the Greek edaphos έδαφος ("ground"; also "pavement") and σαῦρος (sauros) ("lizard").
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or
Gordodon, An extinct genus of non-mammalian synapsid that lived during the Early Permian of what is now Otero County, New Mexico. It grew to be around 1 meters (3 ft.) in length excluding the tail and 34 kilograms (75 lb.) in weight. The unique jaws and teeth of Gordodon amongst early synapsids suggest that it was one of the first herbivorous tetrapods to have specialized in selectively feeding on high nutrient, low-fiber plant fructifications (seeds and fruit-like structures). The generic name is from the Spanish word "gordo", meaning "fat", and the Ancient Greek suffix "-odon" to mean "fat tooth", referring to its characteristically large front teeth. The name is also a play on "Alamogordo", the name of the city close to where the fossil was discovered. The specific name kraineri was chosen in honour of Karl Krainer, a geologist of the University of Innsbruck in recognition of his extensive work on paleontology and geology in New Mexico. If it gets added, the developers should require it to have a lot fruit vegetation in its enclosure.
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4: One of the species bellow as the last option:
Tapinocephalus, A large, herbivorous dinocephalian that lived during the Middle Permian Period in the South African Karoo. They could grow over 3 meters (10 feet) in length and massed around 1.5 to 2 tons (3,300 to 4,400 lb.). They are considered to be one of the largest animals alive during the time they lived; and it is believed they engaged in head butting either for mates and or to control territory, kind of like the Pachycephalosaurs. Its name means humble head.
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Biarmosuchus, An extinct genus of biarmosuchian therapsids that lived around 267 mya during the Middle Permian period. It grew to be around the size of a large dog, around 1.5–2 meters (4.9-6.5 feet) in length. It was named for Bjarmaland, the name for the White Sea region in Old Norse literature.
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Estemmenosuchus, A large, early omnivorous therapsid that lived during the middle part of the Middle Permian around 267 million years ago in Russia. They could grow to around 3 meters (10 feet) long. They have distinctive horn-like structures that are thought to have been used for display. Many remains from different individuals were found together. Its name means crowned crocodile in Greek.
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Tiarajudens, An extinct genus of saber-toothed herbivorous anomodonts which lived during the Middle Permian period (Capitanian stage) in what is now Rio Grande do Sul, Brazil. It grew to be around the size of a wild boar. The most prominent features of Tiarajudens are its two large saber-like canine teeth. These teeth are unlike the tusks of dicynodonts. It is one of the earliest therapsids to have a heterodont dentition. Its name means Tiaraju tooth, which is a reference to Sepé Tiaraju, an indigenous Guaraní leader in the Jesuit reduction mission of São Luiz Gonzaga who led the fight against the Portuguese and Spanish colonial powers in the Guarani War.
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