Episode 319 is all about Dilong, a small feathered tyrannosaur.
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On this episode, we talk about:
Information:
- The Museum of Discovery and Science in Fort Lauderdale, Florida is holding a free on-line speaker occasion about dinosaurs on Jan 7 supply
Better of 2020 (266-318):
Greatest New Sauropod: Bagualia (318)
HM – Greatest New Sauropod: Bravasaurus (314)
HM – Greatest New Sauropod: MCF-PVPH-87 (302)
Greatest New Theropod: Oksoko (307)
HM – Greatest New Theropod: Paraxenisaurus (300)
Greatest New Ornithopod: : Ajnabia odysseus (312)
HM – Greatest New Ornithopod: Changmiania (306)
Greatest Re-description: Dilophosaurus (296)
HM – Greatest Re-description: Scelidosaurus (307)
Gnarliest Pathologies: Worms in sauropod leg (316)
HM – Gnarliest Pathologies: Osteosarcoma in a Centrosaurus (307)
Greatest Early Dinosaur Discovery: Dinosauromorph Kongonaphon (294)
Greatest Intestine Contents: Borealopelta (295)
Greatest Dinosaur Nest: Protoceratops (& Mussaurus) (292)
Greatest Biomechanics Examine: Spinosaurus tail (284 & interview in 300)
Greatest Paleoart: Zuul cake (278 & interview in 281)
Greatest Dinosaur Artwork: Quarry rocks in England (282)
Greatest Video (Brief): Avatar Airbender dinosaur video (312)
Greatest Sudden Place to Discover Dinosaurs: SpaceX astronauts introduced a dinosaur to area (289)
Greatest Dinosaur Thought: Turtles are murderers (308)
Greatest Dinosaur Impression: Evan Johnson-Ransom’s T. rex impression (293)
Greatest Dinosaur Sound: Penguins strolling across the Discipline Museum (294)
Greatest/Worst Dinosaur Public sale (ever): Stan the T. rex (305 & 307)
Largest Courtroom Case: Montana ruling that the Dueling Dinosaurs and different dinosaur fossils aren’t minerals (287, 291 & 313)
Greatest Augmented Actuality: Nationwide Geographic Re-imagining Dinosaurs on Instagram. Seek for filter “natgeo” to search out them (314)
Greatest Dinosaur Recreation: Animal Crossing (297)
HM – Greatest Dino Recreation: Path of Titans
The dinosaur of the day: Dilong
- Basal tyrannosauroid that lived within the Cretaceous in what’s now Liaoning province in China (Yixian Formation)
- Holotype is sort of full, semi-articulated skeleton, and features a practically full cranium
- Sort and solely species is Dilong paradoxus
- Genus identify means emperor dragon (??)
- Genus identify refers back to the relationship of Dilong to T. rex, the king tyrannosaurid
- Species identify means “in opposition to acquired knowledge” or “in opposition to accepted knowledge”, and in response to the unique description, refers “to the stunning characters of this animal” (protofeathers on a tyrannosauroid)
- Described in 2004 by Xu Xing and others
- Holotype was about 5.2 ft (1.6 m lengthy) however could also be a juvenile
- Estimated to be greater than 6.6 ft (2 m) lengthy as an grownup
- Had an extended cranium and slender neck
- Had a Y-shaped cranium crest, with two ridges alongside its snout
- Had comparatively lengthy arms and three fingers on every hand
- Had giant jaw with tightly packed entrance enamel
- Had quick legs, so most likely not a quick runner
- In all probability lively
- In all probability went after lizards, mammals, and birds
- Related seeking to Eotyrannus, which lived within the Cretaceous in what’s now the Isle of Wight, UK
- Intently associated to Yutyrannus
- Lined in protofeathers, which had been present in fossilized pores and skin impressions
- 4 specimens discovered, however just one has protofeather impressions
- Protofeathers discovered across the tail and the again of the top
- Protofeathers had been as much as 0.4 in (3 cm) lengthy, and had been easy and filamentous
- In all probability coated in a downy coat
- Most probably used for insulation, not for flight
- Tyrannosauroid, and lived a lot sooner than T. rex
- First direct proof that tyrannosauroids had protofeathers
- Feathers on Dilong might imply that T. rex and different later tyrannosaurs had feathers
- Had some superior cranium options like later tyrannosaurs, together with fused nasal bones and a rounded snout with entrance enamel which can be D-shaped in cross part, which might give it a “cookie cutter” chew
- Had a small cranium in comparison with later tyrannosaurs
- Pelvis will not be as sturdy as different tyrannosauroids
- Cranium is much less sturdy than different tyrannosauroids, however may very well be as a result of it’s smaller
- In different methods, Dilong regarded like juveniles of later, larger tyrannosaurs
- Dilong exhibits tyrannosaurs had some distinctions earlier than they turned giant like T. rex
- Grownup tyrannosaurs in Alberta, Canada and Mongolia have pores and skin impressions that present pebbly scales. Xu Xing and others prompt tyrannosauroids might have had completely different pores and skin coverings on completely different elements of their our bodies (scales and feathers). Additionally prompt juveniles might have had feathers and adults had scales as a result of they acquired giant sufficient they didn’t want insulation to maintain heat
- Scans of the braincase discovered Dilong had an S-shaped mind with skinny meninges (three membranes that line the cranium and vertebral canal and enclose the mind and spinal wire). T. rex had a extra linear mind with thicker meninges
- Primarily based on the scans, discovered Dilong was most likely agile and had good stability, however didn’t have good a way of odor as T. rex
- Lived in an space with early flowering vegetation, rivers, and streams, with close by volcanoes
- Dinosaurs that lived across the identical time and place included Yutyrannus, Beipiaosaurus, Sinornithosaurus, Psittacosaurus, Tianyuraptor, and Sinocalliopteryx
Enjoyable Truth:
Dilong is the identify of a dinosaur and it’s additionally a reputation used to imply “earthworm” in conventional Chinese language medication and Geosaurus (a marine crocodyliform).