There are at least two acts called Pterodactyl.

Pterodactyl the band resides in Brooklyn, NY. Pterodactyl is Joe Kremer on guitar and vocals, Matt Marlin on drums and vocals, Jesse Hodges on guitar and bass and vocals, and Zach Lehrhoff on guitar and bass and vocals.

"Hyper-rhythmic, skull-cracking hard post-punk trio, playing with laser-guided precision, telegraphing impossible changes, it's as if someone plugged these guys into the nearest available wall socket and flipped the on switch. Lightning Bolt is somewhat of an apt comparison, though they don't waste time with jamming. Les Savy Fav might be too, if that band was as good as people think they are. This is a different beast, on their way to forming an original and completely engrossing sound on their own. It's heavy and brilliant too, if that helps."
-Doug Mosurak, Dusted

Pterodactyl the chiptune/breakcore artist has several releases on the (seemingly now-defunct) Belgian drum & bass/hardcore/experimental Drumadix label, probably best known for their track "Synonyme".
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Artist biography from last.fm