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Episode 296: Dilophosaurus had tall air-filled crests


    Episode 296 is all about Daemonosaurus, the small, buck toothed, Triassic carnivore from New Mexico.

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    On this episode, we talk about:


    • Oculudentavis is now formally simply HPG-15-3 after the Nature article describing it was retracted supply
    • A radical reanalysis of Dilophosaurus specimens clarified its options and relationship to different dinosaurs supply
    • A pair of Bissektipelta braincases exhibits particulars of how its blood vessels labored supply
    • Based on NPR, one-third of the museums within the U.S. could completely shut this yr supply
    • The Quarry Exhibit Corridor at Dinosaur Nationwide Monument has reopened with timed tickets supply
    • Dinosaur Journey Drive-Through is in St. Paul, Minnesota by means of August ninth supply
    • Bryce Dallas Howard shared some pictures on Twitter of the bruises she’s gotten doing stunt work for Jurassic World Dominion supply
    • In August, the Jurassic Park Trilogy is coming again to Netflix within the US supply
    • The trailer for Jurassic World: Camp Cretaceous was launched supply

    The dinosaur of the day: Daemonosaurus

    • Basal theropod that lived within the Late Triassic in what’s now New Mexico, US (Chinle Formation at Ghost Ranch)
    • Some estimates to be about 5 ft (1.5 m) lengthy, others estimate 7 ft (2.2 m) lengthy and weighed 49 lb (22 kg)
    • Most likely about the identical peak as a tall canine
    • Cranium was about 5.5 in (14 cm) lengthy
    • Had very massive eye sockets
    • Had a brief cranium and lengthy tooth, which was completely different from different early theropods that had lengthy heads and jaws
    • Carnivorous, had serrated tooth
    • Had massive premaxillary and maxillary tooth within the higher jaw (massive entrance tooth)
    • The primary two tooth within the decrease jaw are massive
    • Had heterodont tooth (completely different formed tooth)
    • Premaxilla (tip of the higher jaw) and the entrance higher (anterior maxillary) jaw tooth are very massive in comparison with the again higher (posterior maxillary) tooth
    • Hans Dieter-Sues stated the massive entrance tooth have been good for seizing and killing prey, and it in all probability had a strong chew becuase of the quick, deep snout (in accordance with LiveScience)
    • Solely the holotype has been discovered
    • Holotype features a practically full cranium, vertebrae, and ribs
    • Cranium was practically full however crushed
    • Sort species is Daemonosaurus chauliodis
    • Genus identify means “demon lizard”, and refers back to the legends about evil spirits at Ghost Ranch
    • Species identify means “buck toothed” or “distinguished toothed” or “excellent tooth”
    • Fossils have been discovered by E.H. Colbert within the Eighties
    • Present in a block of mudstone
    • The mudstone was on mortgage from Carnegie Museum to the State Museum of Pennsylvania, and guests might watch volunteers put together the rock. A volunteer discovered the Daemonosaurus cranium
    • Named in 2011 by Hans-Dieter Sues and others
    • Unclear if the holotype is an grownup or juvenile (massive eye sockets and no fused bones between braincase bones level to juvenile, however sutures on vertebrae close to the cranium are closed like an grownup’s)
    • Discovered with fossils of Coelophysis
    • Colbert stated in 1989 that Daemonosaurus and some Coelophysis have been washed right into a small pond, then they drowned and have been buried shortly after
    • Lived in a heat, monsoon-like local weather with a lot of rain
    • A lot of prey round, and animals generally (Coelophysis, reptiles, fish)
    • Vegetation included conifers, ferns, horsetails
    • A lot of animals discovered shut collectively, in all probability due to a flash flood
    • Earlier than Daemonosaurus was discovered, there was a niche within the Mid Triassic and paleontologists thought these early carnivores had gone extinct (now know they have been numerous and lived within the Late Triassic)
    • Helps present the range of early theropods
    • Helps present that theropods had completely different cranium shapes
    • Completely different cranium shapes meant completely different feeding methods, so they might co-exist
    • Daemonosaurus helps present the hyperlink between basal and later theropods
    • Based mostly on its options, appears to be like like a mixture of early theropods like Eodromaeus (from South America) and extra superior theropods like Tawa (additionally from Ghost Ranch), nevertheless it lived after each Eodromaeus and Tawa, so it’s very unusual and doubtless means Daemonosaurus got here from early theropods that got here to North America and lived alongside newer evolving theropods. One of many options is cavities on a few of the neck vertebrae associated to the construction of the respiratory system, in accordance with Hans-Dieter Sues, which is the kind of respiratory system we see in neotheropods and trendy birds
    • Hans-Dieter Sues stated Daemonosaurus could also be a part of a dinosaur lineage that didn’t evolve later within the Mesozoic
    • Daemonosaurus fossils are actually within the assortment of the Carnegie Museum of Pure Historical past

    Enjoyable Truth:
    There are numerous animals (and certain dinosaurs) that profit from forest fires.