This video from the USA says about itself:
Why Triassic Animals Were Just the Weirdest
5 June 2018
The Triassic was full of creatures that look a lot like other, more modern species, even though they’re not closely related at all.
The reason for this has to do with how evolution works and with the timing of the Triassic itself: when life was trapped between two mass extinctions.
And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/.
Finally, thanks to Emilio Rolandia, Matt Celeskey, and Studio 252mya for their excellent images as well.