#ornithischian

[paleoforest]

ANKYLOS!

[dynasoar5]

study pose. ceratopsian woman

[chameleocoonj]

a group of little weirdos :}

[vhsdruid]

pachycephalosaurus wyomingensis

[ppaleoartistgallery]

#Paleostream 15/06/2024

here's today's #Paleostream sketches!!! today we drew Pikaia (no longer upside down!), Torukjara, Koreanosaurus, and Istiodactylus

[makairodonx]

Paleo-Profiles: Peloroplites cedromontanus and Utahraptor ostrommaysi

Impressions of two different dinosaurs, one orntihischian and one saurischian, that lived in two separate members of eastern Utah’s Cedar Mountain Formation, which spans much of the Early Cretaceous in a period lasting from 140 to 94 million years ago; Peloroplities cedrimontanus from the uppermost 104-93 mya Mussenthuchit Memeber, and Utahraptor ostrommaysi from the much lower 139-134.6 mya Yellow Cat Member.

Peloroplities was one of the largest, bulkiest and heaviest nodosaurs of the Cenomanian-Turonian stages, a time when Eurasia and especially North America were witnessing a peak in Nodosaurid diversity. It grew up 6 meters long and 2 tonnes in weight, and was a contemporary of the smaller nodosaurs Animantarx and Cedarpelta and saurischians such as Abydosaurus, Moros and Siats.

A 5-7 meters long, 2 meters tall an kilograms in weight, Utahraptor was the largest and heaviest memeber of the dromaeosauridae, the iconic sickle-claws maniraptorans that would later include dinosaurs such as Deinonychus, Dromaeosaurus, Sauronitholestes and Velociraptor. Its heavily-robust build, large sickle claw, powerful leg muscles, and deep jaws were well-suited for ambushing and dispatching large prey animals such as the sauropod Cedarosaurus and the giant ornithopod Iguanacolossus, and as a solitary hunter it may have formed loose, mob-like groups of other Utahraptors to to tackle difficult-to-hunt prey in a similar fashion to modern crocodiles and Komodo dragons. This is demonstrated by the discovery of a 9-ton fossil block of limestone in 2001 that preserves a mob of several Utahraptors of varying ages that all died while trying to take on a single iguanodont that got stuck in a large pool of quicksand.

[alphynix]

Spectember/Spectober 2024 #07: Mole Dino

Today's spec creature is a combination of a couple of submissions �� James P. Quick asked for "a post-K/Pg relict dinosaur from pre-glaciation Antarctica", and an anonymous asked for "a subterranean (like, say, Talpa or Spalax) burrowing dinosaur":

At the time of the K/Pg mass extinction some of the small ornithopods that inhabited Late Cretaceous Antarctica had been developing increasingly complex burrowing behavior and a more generalist omnivorous diet than most other ornithischians – and, along with their ability to endure the long dark cold polar winters, this was juuust about enough for them to survive while the rest of their non-avian cohorts vanished.

They were very briefly a fairly successful disaster taxon in the devastated polar forests, but they were quickly displaced by other diversifying survivors and never really got another ecological foothold to regain anything close to the non-avian dinosaurs' former glory.

Instead the little ornithopods specialized even further for burrowing, spending more and more of their lives underground to avoid the increasing competition and predation from mammals and birds.

Now, well into the Cenozoic at the dawning of the Miocene, Cthonireliqua quicki is the very last representative of the non-avian dinosaurs. Small and stocky and mole-like, just 15cm long (~8"), it has muscular forelimbs with large shovel-like claws, a keratinous shield on its head, and a thick bristly tail where large fat reserves are stored.

Its eyes are almost completely absent, only vestigial remnants present under the skin of its face, and it navigates its extensive burrows using sensitive whisker-like filaments and its keen senses of hearing and smell. Still omnivorous like its ancestors, it feeds on whatever it comes across while tunneling – mainly worms, insects, smaller vertebrates, roots, and tubers.

Unfortunately for Cthonireliqua, and the rest of its Antarctic ecosystem, time is running out. Over the last few million years Antarctica's climate has been steadily cooling and drying, the continent has become fully isolated, and the Antarctic Circumpolar Current has formed. Glaciation is well underway in the continental interior, and the once-lush forests are shrinking away and being replaced with tundra.

Soon all evidence of these dinosaurs' existence will be buried under the ice.

[joakinmar]

Thescelosaurus neglectus by Anthony J. Hutchings.

[mesozoicmarket]

A fossilized vertebra of a Levnesovia transoxiana from the Bissekty Formation in Dzharakuduk or Uchkuduk, Kyzylkum Desert, Uzbekistan. This early diverging hadrosauromorph belongs to a group that includes the famous "duck-billed" dinosaurs. This relatively small hadrosaur was likely prey for the basal pantyrannosaur Timurlengia and the large theropod Ulughbegsaurus.

[esmaniottoart]

Study of a Three-Horned Face_Triceratops Sheet. Pencils (2021) and digital (2024).

References Matt Dempsey. Prieto-Marquez, A. & Wagner, Jonathan. (2014). Soft-tissue structures of the nasal vestibular region of Saurolophine Hadrosaurids (Dinosauria, Ornithopoda) revealed in a “mummified” specimen of edmontosaurus annectens.

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[knuppitalism-with-ue]

Another sketch brought to you by #paleostream!

A leucistic Regaliceratops steps into the light.

[huitzilinf-art]

Miragaia longicollum

Commission for Primal Creations https://twitter.com/Primal_Creation Miragaia longicollum skeletal referenced from Ashley Patch(Plastospleen) https://www.artstation.com/ashleypatch

[dynasoar5]

watercolor sketch. profile view of a sauropod woman in a headdress

[tyrannoninja]

Silesaurus

Silesaurus opolensis was an dinosauriform archosaur that lived in Europe during the Late Triassic Period around 220 million years ago. An insect-eater with a body length of around seven and a half feet, Silesaurus has been traditionally considered a member of a sister lineage to dinosaurs proper, but some recent paleontological analyses suggest that it may be a true dinosaur at the base of the ornithischian lineage (the grouping of dinosaurs that includes the duck-billed hadrosaurs, the armored stegosaurs and ankylosaurs, and the horn-faced ceratopsians). Like the ornithischians, Silesaurus appears to have had a beak covering the tip of its lower jaw (or predentary).

[a-dinosaur-a-day]

Happy ween!!!

Trick or treat

What a precious bean! Love the fashion accessory

Jakapil!

[ppaleoartistgallery]

#Paleostream 20/07/2024

here's today's #Paleostream sketches!!! today we drew Morturneria, Atopodentatus, Comptonatus, and Trigonosaurus