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Mesozoic


Triassic

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A relative of Sclerothorax that has an even bigger hump of elongated neural spines. Sclerothoracidae.

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A Triassic horseshoe crab which has backswept, bull-like cephalic horns. Austrolimulidae.

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​Bird-like, bipedal sphenosuchian, with a beak-like mouth. Sphenosuchia.
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​Termite-eating cynodont, converging on anteaters and echidnas. Chiniquodontidae novis.
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​Large dicynodont with a rhinoceros-like horn. Kannemeyeriidae.
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​Giant rauischian that converges on carnivorous dinosaurs in being an obligate biped, 9 meters long. Rauisuchidae.
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Stem-pterosaur with incipient flight adaptations. Ornithodira.
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Jurassic

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​Relative of Chilesaurus, which is as long as 6 meters, with a covering of pangolin-like scales, derived from primitive feathers. Tetanurae.
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An ammonite which adheres to eachother in large clusters to form passively floating colonies. Kosmoceratidae.

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Large carnivorous prosauropod, Anchisauria.

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Ichthyosaur which is adapted to filter feed like a whale, using its teeth as a filter. Stenopterygiidae novis.

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​Thyreophoran which is covered in large pointed spines, much like a porcupine. Basal Thyreophora.
 
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A carnivorous dinosaur which kills prey with sabre-like front teeth. Ceratosauridae.

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Venomous compsognathid coelurosaur, having channelled fang-like teeth. Compsognathidae.

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Theropod which has three bony crests instead of 2 or 1. Proceratosauridae.

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A relative of Pterodactylus that is specialized for probing the sediment in search of invertebrates. Pterodactylidae.


Cretaceous

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A repenomamus-like mammal which reaches the size of a large lynx. Gobiconodontidae.

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A loosely coiled Ammonite that has a ripsaw-like arrangement of ornamentation on its shell. Ancyloceratidae.

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A relative of Dolichosaurus that has a laterally flattened body and tail, as with many modern sea snakes. Dolichosauridae.

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A short-necked Rebbachisaur with an elongate, horse-like face for grazing on low stubby growth such as ferns. Rebbachisauridae.

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A giant relative of Vinctifer, maybe 8 meters long, which inhabits the southern ocean, filling a niche that is filled elsewhere by fish like Bonnerichthys. Aspidorhynchidae.

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Appalachian tyrannosaur, which has large raptorial arms, and reaches up to 10 meters long. Tyrannosauroidea.

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Mosasaur which grubs in the mud for invertebrates using its sensitive lips, which contain mechanoreceptors. Halisaurinae.

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A relative of Hoploparia which has differentiated large and small claws much like a fiddler crab, for courtship purposes. Nephropidae.

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A deep-sea Pycnodont fish which is almost completely scale-less, and has silvery skin. Pycnodontiformes.

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A Multituberculate with clear adaptations of the lower limb, towards a hopping mode of locomotion. Djadochtatheriidae.

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A mid-sized Titanosaur, which is extremely robust proportionally for its size. Lithostrotia.

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A Lambeosaur which has a hollow crest bigger than any other. Lambeosaurini.

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A long-legged terrestrial Enantiornithine that behaves much like a seriema or secretary bird. Enantiornithes.

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A Notosuchian with limb anatomy strongly adapted for cursorial movement. Notosuchia.

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An insular Multituberculate which is adapted to prey upon various smaller animals including vertebrates. Kogaionidae.

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A primitive ceratopsian which is mainly carnivorous in its adaptations. Leptoceratopsidae.

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Medium-sized duckbill, which is adapted to a moose-like, water-plant eating lifestyle. Saurolophinae.

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Ceratopsian which has one large nose horn, and very little other ornamentation. Centrosaurinae.

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Hawk-like enantiornithe with large raptorial feet and claws. Avisauridae.

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Noasaur which spends much of its time underground, like a badger. Noasauridae.

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