Daily Dino Factsさんのイラストまとめ

#Unaysaurus was a sauropodomorph from #Brazil ~225mya. Known from a partial ~2m long individual, it is one of the earliest members of the long-neck lineage - still very close to the base of dinosauria (which evolved only a few million years earlier).

Art by @opaleoartista

The #StMaryRiverFormation of Southern #Alberta & North #Montana dates back to ~72-67mya. Populated by ginkgos, conifers, grasses, & ferns, this swampy environment sat on the Western Interior Seaway and was home to many ceratopsians like #Regaliceratops.

Art by ABelov2014 on DA

"The Narrow Clawed Lizard": #Stenonychosaurus was a small predatory dino from Western North America. This troodontid lived roughly 76mya where it likely filled an ecological role similar to modern coyotes - hunting small prey & scavenging.

Beautiful #Paleoart by @kta92751434

The #Candeleros has a diverse fossil record of small animals. Primitive legged snakes, turtles, and small mammals have all been discovered in these rocks. The 1.5 meter #Buitreraptor likely exploited these as food.

All illustrated below by @StievenVdP and sold by @studio252mya.

#Achelousaurus was a pachyrhinosaurine horned dinosaur that is identifiable by its nasal boss and long rear/outward curving parietal horns. Named and excavated by Jack Horner in #Montana, the Museum of the Rockies holds most of this dino's known material. #paleontology

"The Ghost Hunter": #Spectrovenator was a predatory dinosaur native to #Brazil ~125mya. It is known from a single, fairly complete individual that was discovered beneath a titanosaur. Illustrated below by @Just9Art, it was an early, critical step in the evolution of abelisaurids.

#Mochlodon is a small herbivorous dinosaur (very similar to #Zalmoxes) discovered in the mid 1800s by miners in #Austria. Maxing out at roughly 3m long, their diet was likely the soft vegetation found on forest floors.

Art by @TheWoodParable

The La Quinta Formation is one of South America's only windows into the early #Jurassic. #Dinosaurs like Tachiraptor and Laquintasaurus (illustrated below by Maurílio Oliveira) roamed this volcanic coastal floodplain in what is now #Venezuela & #Colombia ~200 million years ago.

Today's #FossilFriday is about dino combat. @VictoriaArbour et al published a paper this week suggesting ankylosaur club-tails were used in intraspecies fights. Damaged armour on #Zuul (red below) has been proposed as injuries from the club of another Zuul based on placement!

Most advanced theropods belonged to a group called Tetanurae (meaning "stiff tails"). This clade contains all animals closer to birds than ceratosaurs back to their most recent common ancestor. Tetanurans share a number of defining traits like having 3 or fewer functional fingers