sarcasmosaur:

“day 5: favourite maniraptoran”
Ehhh…just felt like drawing a Jinfengopteryx Idunno.

sarcasmosaur:

day 5: favourite maniraptoran”

Ehhh…just felt like drawing a Jinfengopteryx Idunno.

paleoillustration:

New Study Helps to Explain How Dinosaurs Got their Wings (Everything Dinosaur)

“These findings eliminate persistent doubts that existed over exactly how the bones of the wrist evolved and iron out arguments about wrist development being incompatible with birds originating from dinosaurs.”

Picture 1 credit: Davide Bonadonna

Picture 2 credit: PLoS Biology (link to the original article)

ewilloughby:

This is a speculative reconstruction of a subadult Deinonychus displaying semi-arboreal characteristics. It’s based on the tenuous assumption that the type specimen (YPM 5205) represents an immature animal, as compared to later specimens with slightly different morphological characteristics, most notably the Harvard specimen (MCZ 4371) described in 1976. Ostrom noted in the description for this newer specimen that one of the major differences between this and the type is the angle of curvature for the second pedal claw: the newer specimen had a much straighter sickle claw, while the original was very strongly curved. However, he had no opinion at the time on whether this difference in morphology represented individual, ontogenetic, or sexual variation.(1)
In 2006, Parsons & Parsons demonstrated unequivocally that the Harvard specimen is a sexually mature adult, and identified some unique adult characters associated with this and other mature adult Deinonychus specimens.(2) Further study by the same authors in 2009 tentatively indicates that the type specimen—a possible subadult—may be associated with arboreal characteristics. Adult specimens are also found to have proportionally shorter arms, leaving room to speculate whether the longer arms of subadults could have been a semi-volant adaptation involved in some incipient gliding (or, perhaps more accurate for an animal that size, “descent-slowing”) capabilities. The more strongly recurved second pedal claw is implicated in climbing, and its lateral compression and inner arc are compared in this paper to the same ungual in Melanerpes, the red-headed woodpecker (a highly scansorial modern bird).(3)
Behavior rarely fossilizes, and the idea that immature Deinonychus occupied a partially arboreal niche is still highly speculative, especially given that few modern archosaurs possess markedly different ecologies at different ontogenic stages. And while I don’t usually support copying extant birds this precisely for serious paleoart, it proved to be an excellent practice piece to flesh out a highly speculative idea.
This piece is based directly on an excellent photograph by my most admired living scientist, experimental psychologist Steven Pinker, who was kind enough to grant me permission to do so. Pinker is a world-renowned cognitive scientist as well as a talented photographer, and you can check out more of his better angles of our nature on his website at stevepinker.com.
It’s interesting to note that of all known specimens of deinonychosaurs, a sizable percentage of them represent juveniles or subadults, animals that lived very brief lives before succumbing to nature’s indifference. For the life of a Deinonychus was surely solitary, poor, nasty, brutish and short.
—
1. Ostrom, J. H. (1976). “On a new specimen of the Lower Cretaceous theropod dinosaur Deinonychus antirrhopus”. Breviora 439: 1–21.2. Parsons, W. L.; Parsons, K. M. (2006). “Morphology and size of an adult specimen of Deinonychus antirrhopus, (Saurischia, Theropoda)”. Journal of Vertebrate Paleontology 26 (3 sup.): 109A.3. Parsons, W. L.; Parsons, K. M. (2009). “Further descriptions of the osteology of Deinonychus antirrhopus (Saurischia, Theropoda)”. Bulletin of the Buffalo Society of Natural Sciences 38: 43–54.

ewilloughby:

This is a speculative reconstruction of a subadult Deinonychus displaying semi-arboreal characteristics. It’s based on the tenuous assumption that the type specimen (YPM 5205) represents an immature animal, as compared to later specimens with slightly different morphological characteristics, most notably the Harvard specimen (MCZ 4371) described in 1976. Ostrom noted in the description for this newer specimen that one of the major differences between this and the type is the angle of curvature for the second pedal claw: the newer specimen had a much straighter sickle claw, while the original was very strongly curved. However, he had no opinion at the time on whether this difference in morphology represented individual, ontogenetic, or sexual variation.(1)

In 2006, Parsons & Parsons demonstrated unequivocally that the Harvard specimen is a sexually mature adult, and identified some unique adult characters associated with this and other mature adult Deinonychus specimens.(2) Further study by the same authors in 2009 tentatively indicates that the type specimen—a possible subadult—may be associated with arboreal characteristics. Adult specimens are also found to have proportionally shorter arms, leaving room to speculate whether the longer arms of subadults could have been a semi-volant adaptation involved in some incipient gliding (or, perhaps more accurate for an animal that size, “descent-slowing”) capabilities. The more strongly recurved second pedal claw is implicated in climbing, and its lateral compression and inner arc are compared in this paper to the same ungual in Melanerpes, the red-headed woodpecker (a highly scansorial modern bird).(3)

Behavior rarely fossilizes, and the idea that immature Deinonychus occupied a partially arboreal niche is still highly speculative, especially given that few modern archosaurs possess markedly different ecologies at different ontogenic stages. And while I don’t usually support copying extant birds this precisely for serious paleoart, it proved to be an excellent practice piece to flesh out a highly speculative idea.

This piece is based directly on an excellent photograph by my most admired living scientist, experimental psychologist Steven Pinker, who was kind enough to grant me permission to do so. Pinker is a world-renowned cognitive scientist as well as a talented photographer, and you can check out more of his better angles of our nature on his website at stevepinker.com.

It’s interesting to note that of all known specimens of deinonychosaurs, a sizable percentage of them represent juveniles or subadults, animals that lived very brief lives before succumbing to nature’s indifference. For the life of a Deinonychus was surely solitary, poor, nasty, brutish and short.

1. Ostrom, J. H. (1976). “On a new specimen of the Lower Cretaceous theropod dinosaur Deinonychus antirrhopus”. Breviora 439: 1–21.

2. Parsons, W. L.; Parsons, K. M. (2006). “Morphology and size of an adult specimen of Deinonychus antirrhopus, (Saurischia, Theropoda)”. Journal of Vertebrate Paleontology 26 (3 sup.): 109A.

3. Parsons, W. L.; Parsons, K. M. (2009). “Further descriptions of the osteology of Deinonychus antirrhopus (Saurischia, Theropoda)”. Bulletin of the Buffalo Society of Natural Sciences 38: 43–54.

openfigs:

Figure 8. Ventral view of Deinonychus foot (MOR 747) in flexion.
Citation: Fowler DW, Freedman EA, Scannella JB, Kambic RE (2011) The Predatory Ecology of Deinonychus and the Origin of Flapping in Birds. PLoS ONE 6(12): e28964. doi:10.1371/journal.pone.0028964

openfigs:

Figure 8. Ventral view of Deinonychus foot (MOR 747) in flexion.

Citation: Fowler DW, Freedman EA, Scannella JB, Kambic RE (2011) The Predatory Ecology of Deinonychus and the Origin of Flapping in Birds. PLoS ONE 6(12): e28964. doi:10.1371/journal.pone.0028964

transhamlet:

quick utahraptor doodle, scanner still not ct’d

Rather, generic eudromaeosaur.

transhamlet:

quick utahraptor doodle, scanner still not ct’d

Rather, generic eudromaeosaur.

palaeoplushies:

My Kickstarter Campaign for the plushie velociraptor is live! Click here!

Here’s your chance to get your hands on some Velociraptor-themed goodies!

I’m so excited! Thanks everyone!

Please signal-boost if you like!

I implore everyone to support her Kickstarter! She worked hard on her stuff and the results are amazing. Spread the word and/or get yourself a fluffy V.mongoliensis!

palaeoplushies:

Things have been rather quiet from Palaeoplushie land… but it’s the quiet before the storm.
Here’s some previews of the upcoming kickstarter! Some sticker art, a mock-up of a enamel pin badge and the star attraction: The plushie velociraptor itself!

(Also, a massive thanks to Scott Hartman for the skeletal that the top image and subsequent designs were based off of! http://www.skeletaldrawing.com/)

Reblog to help a friend, go Bex!

assuming-dinosaur:

A̷ͧ͛̏͘L̵ͤ̇͋̅̃̚͘L͊̈ͪ̋̒̽̅͛҉͘͝ ̇͊̔̐ͨ̊͗͞͏H̛̛ͮ͆́Aͨ̐͋͑Ḯ̈́̌͂̍L̸͗ͤ͢ ̛̂͛ͣ͊̑̑҉Ť͐̓̈́ͩ̽͡Ḧ̵́̄͂͗E̢̓̎ ́̑̋̆̆͟͞M̷̽̈͌ͣI̧ͪͯ͋͑͏Ḡ͗͒͂̄̕H̷̃ͦ̇͘͘T̨̽ͨ̈ͦ̚̚Ȳ̈̒̓ͥ̚̕ ̷̨̿ͨ̈́ͭ͜Gͧ͜L̸̇ͦͫͬ͝͡O͐ͦ̈́̀͘͢W̢̿ͯ́ ̡́̓̒ͬ̔̾ͩͨ͜͠R̷̨ͮ̾̀͌ͯ̾ͯͬA͆ͫ̑ͩP͗͏T̨̄͐̓ͥ͋͒ͦ͢O̓̇̐ͦ̿͗ͤͤ͏̛Řͤͧ̏̔͌ͬ̍͜

assuming-dinosaur:

A̷ͧ͛̏͘L̵ͤ̇͋̅̃̚͘L͊̈ͪ̋̒̽̅͛҉͘͝ ̇͊̔̐ͨ̊͗͞͏H̛̛ͮ͆́Aͨ̐͋͑Ḯ̈́̌͂̍L̸͗ͤ͢ ̛̂͛ͣ͊̑̑҉Ť͐̓̈́ͩ̽͡Ḧ̵́̄͂͗E̢̓̎ ́̑̋̆̆͟͞M̷̽̈͌ͣI̧ͪͯ͋͑͏Ḡ͗͒͂̄̕H̷̃ͦ̇͘͘T̨̽ͨ̈ͦ̚̚Ȳ̈̒̓ͥ̚̕ ̷̨̿ͨ̈́ͭ͜Gͧ͜L̸̇ͦͫͬ͝͡O͐ͦ̈́̀͘͢W̢̿ͯ́ ̡́̓̒ͬ̔̾ͩͨ͜͠R̷̨ͮ̾̀͌ͯ̾ͯͬA͆ͫ̑ͩP͗͏T̨̄͐̓ͥ͋͒ͦ͢O̓̇̐ͦ̿͗ͤͤ͏̛Řͤͧ̏̔͌ͬ̍͜

(Source: artisticthingem)