Welcome Guest [Log In] [Register]






Shoot a firework rocket ~ Winners!
Make a forum zoo!

Welcome to The Round Table. We hope you enjoy your visit.


You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free.


Join our community!


If you're already a member please log in to your account to access all of our features:

Username:   Password:
Add Reply
New Troodontid with asymmetrical wing feathers
Topic Started: May 2 2017, 12:35 PM (628 Views)
Jules
Member Avatar
Mihi est imperare orbi universo

Nature
 
Asymmetrical feathers have been associated with flight capability but are also found in species that do not fly, and their appearance was a major event in feather evolution. Among non-avialan theropods, they are only known in microraptorine dromaeosaurids. Here we report a new troodontid, Jianianhualong tengi gen. et sp. nov., from the Lower Cretaceous Jehol Group of China, that has anatomical features that are transitional between long-armed basal troodontids and derived short-armed ones, shedding new light on troodontid character evolution. It indicates that troodontid feathering is similar to Archaeopteryx in having large arm and leg feathers as well as frond-like tail feathering, confirming that these feathering characteristics were widely present among basal paravians. Most significantly, the taxon has the earliest known asymmetrical troodontid feathers, suggesting that feather asymmetry was ancestral to Paraves. This taxon also displays a mosaic distribution of characters like Sinusonasus, another troodontid with transitional anatomical features.


https://www.nature.com/articles/ncomms14972
Offline Profile Quote Post Goto Top
 
stargatedalek
Member Avatar
I'm not slow! That's just my moe!

"Asymmetrical feathers have been associated with flight capability but are also found in species that do not fly, and their appearance was a major event in feather evolution. Among non-avialan theropods, they are only known in microraptorine dromaeosaurids."

Isn't this a contradiction?
Offline Profile Quote Post Goto Top
 
magpiealamode
Member Avatar
No good hero is a one-trick phony.

Not if they're referring to flightless birds.
Offline Profile Quote Post Goto Top
 
babehunter1324
No Avatar


Heh. So that's why Midiaou didn't publish the source for this diagram:
Posted Image

Offline Profile Quote Post Goto Top
 
Stan The Man
Member Avatar
Honorary Party Member

stargatedalek
May 2 2017, 02:28 PM
"Asymmetrical feathers have been associated with flight capability but are also found in species that do not fly, and their appearance was a major event in feather evolution. Among non-avialan theropods, they are only known in microraptorine dromaeosaurids."

Isn't this a contradiction?
Fixed it for ya.
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Extinct Animals & Evolution · Next Topic »
Add Reply