Science, Tech, Math › Animals & Nature Concavenator Share Flipboard Email Print Elenarts / Getty Images Animals & Nature Dinosaurs Carnivores Basics Paleontologists Dinosaurs & Birds Herbivores Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated March 06, 2017 Discovering a new genus of dinosaur is rare enough, but discovering a new genus of dinosaur possessing a never-before-seen anatomical feature is a once-in-a-lifetime event. Concavenator Name: Concavenator (Greek for "Cuenca hunter"); pronounced con-CAV-eh-nate-orHabitat: Woodlands of western EuropeHistorical Period: Early Cretaceous (130 million years ago)Size and Weight: About 20 feet long and 2-3 tonsDiet: MeatDistinguishing Characteristics: Triangular hump on lower back; possible feathers on forearms Unique Physical Characteristics of Concavenator Imagine the wonderment of the Spanish team of researchers that recently dug up Concavenator, a large theropod of early Cretaceous Europe that sported not one, but two, extremely odd adaptations: first, a triangular structure on its lower back, just above the hips, that may have supported a sail or fatty hump; and second, what appear to be "quill knobs" on its forearms, that is, bony structures that probably supported small arrays of feathers. So what accounts for these strange features? Well, the 20-foot-long Concavenator was a close relative of Carcharodontosaurus, which was itself related to the huge, sail-backed Spinosaurus—so the hump/sail on this new dinosaur shouldn't come as a surprise, even though it was situated much further down the spinal column than on other dinosaurs (another surprise: until recently, these types of theropods were thought to be restricted to South America and Africa). As for the quill knobs, those are more of a mystery: to date, only much smaller theropods than Concavenator, mostly "dino-birds" and raptors, have shown evidence of arm feathers. Clearly, the feathers on Concavenator's forearms (and probably only on its forearms) were meant for display rather than insulation, which may provide clues about the subsequent evolution of feathered flight.