![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
gravityeyelidsvia https://ift.tt/2xWNV95
pangur-and-grim:
verylargefrogs:
pangur-and-grim:
pangur-and-grim:
pangur-and-grim:
pangur-and-grim:
making two extremely bitter dinosaur shirts for myself to wear to the June 22 2018 Jurassic World 2 premiere
this is the first one
let’s be real, no matter how crap this movie is I WILL be going multiple times. thus, multiple outfits - here’s number 2
ALRIGHT, getting a lot of messages arguing with the rooster! so I’ll break it down once, & then please obey the rooster’s speech bubble
1. Birds are Dinosaurs
at this point, no sane person can deny the relationship between birds & non-avian dinosaurs. if through magic you saw a photo of velociraptor today, you’d just say “neat-o I think that turkey has teeth!” & go back to scrolling your twitter feed.
but let’s clarify what a dinosaur is: Dinosauria is defined as the MCRA (most common recent ancestor) of Megalosaurus & Iguandon, and all their descendants thereof. you see that branching cladogram up above? everything past ‘Archosauria’ is an archosaur, including birds, everything past ‘Dinosauria’ is a dinosaur, including birds, and everything past ‘Aves’ is a bird.
so, Tyrannosaurus rex is not a bird, but a house sparrow IS a dinosaur.
2. Birds are Reptiles
many clades (groups consisting of a common ancestor & all it’s descendants) were made based on physical features like ectothermy and scales, before we fully understood who was related to who. so birds were not originally intended to be grouped with reptiles, but tracing their path backward in the tree of life, birds are nested in Archosauria (crocodiles, pterosaurs, dinosaurs, etc.), which is in turn nested in Reptilia (turtles, lizards, snakes, etc.)
by our own stupid rules, birds are reptiles.
The term “reptiles” should not be used at all in scientific discussions of phylogenetic relationships. Reptiles are a grade, a polyphyletic group constructed before we had evidence of birds being dinosaurs. The grup containing reptiles and birds is Sauropsida. Bird are not reptiles, but they are dinosaurs, which is a much cooler assertion.
(Your picture was not posted)
pangur-and-grim:
verylargefrogs:
pangur-and-grim:
pangur-and-grim:
pangur-and-grim:
pangur-and-grim:
making two extremely bitter dinosaur shirts for myself to wear to the June 22 2018 Jurassic World 2 premiere
this is the first one
let’s be real, no matter how crap this movie is I WILL be going multiple times. thus, multiple outfits - here’s number 2
ALRIGHT, getting a lot of messages arguing with the rooster! so I’ll break it down once, & then please obey the rooster’s speech bubble
1. Birds are Dinosaurs
at this point, no sane person can deny the relationship between birds & non-avian dinosaurs. if through magic you saw a photo of velociraptor today, you’d just say “neat-o I think that turkey has teeth!” & go back to scrolling your twitter feed.
but let’s clarify what a dinosaur is: Dinosauria is defined as the MCRA (most common recent ancestor) of Megalosaurus & Iguandon, and all their descendants thereof. you see that branching cladogram up above? everything past ‘Archosauria’ is an archosaur, including birds, everything past ‘Dinosauria’ is a dinosaur, including birds, and everything past ‘Aves’ is a bird.
so, Tyrannosaurus rex is not a bird, but a house sparrow IS a dinosaur.
2. Birds are Reptiles
many clades (groups consisting of a common ancestor & all it’s descendants) were made based on physical features like ectothermy and scales, before we fully understood who was related to who. so birds were not originally intended to be grouped with reptiles, but tracing their path backward in the tree of life, birds are nested in Archosauria (crocodiles, pterosaurs, dinosaurs, etc.), which is in turn nested in Reptilia (turtles, lizards, snakes, etc.)
by our own stupid rules, birds are reptiles.
The term “reptiles” should not be used at all in scientific discussions of phylogenetic relationships. Reptiles are a grade, a polyphyletic group constructed before we had evidence of birds being dinosaurs. The grup containing reptiles and birds is Sauropsida. Bird are not reptiles, but they are dinosaurs, which is a much cooler assertion.
(Your picture was not posted)
