What, exactly, is a Pterodactyl anyway?
"Pterodactyl" is the generic word many people use to refer to two famous pterosaurs of the Mesozoic Era: Pteranodon and Pterodactylus. Ironically, though, these two winged reptiles weren't all that closely related to one another, and they were each interesting enough in their own right to merit the use of their proper names. Below you'll discover 10 essential facts about these so-called "pterodactyls" that every admirer of prehistoric life should know.01of 10
There's No Such Thing as a Pterodactyl
It's unclear at what point "pterodactyl" became the pop-culture synonym for pterosaurs in general, and for Pterodactylus and Pteranodon in particular, but the fact remains that this is the word most people (and Hollywood screenwriters) prefer to use. Working paleontologists never refer to "pterodactyls," instead of focusing on individual pterosaur genera, of which there were literally hundreds (and woe to any scientist who confuses Pteranodon with Pterodactylus!)
Neither Pterodactylus nor Pteranodon Had Feathers
Despite what some people still think, modern birds didn't descend from pterosaurs like Pterodactylus and Pteranodon, but from the small, two-legged, meat-eating dinosaurs of the Jurassic and Cretaceous periods, many of which were covered with feathers. As far as we know, Pterodactylus and Pteranodon were strictly reptilian in appearance, though it now seems that some odd pterosaur genera (like the late Jurassic Sordes) sported hair-like growths.03of 10
Pterodactylus Was the First Pterosaur Ever Discovered
The "type fossil" of Pterodactylus was discovered in Germany in the late 18th century, well before scientists had a firm understanding of pterosaurs, dinosaurs, or (for that matter) the theory of evolution, which was only formulated decades later. Some early naturalists even mistakenly believed (though not after 1830 or so) that Pterodactylus was a kind of bizarre, ocean-dwelling amphibian that used its wings as flippers! As for Pteranodon, its type of fossil was discovered in Kansas in 1870, by the famous American paleontologist Othniel C. Marsh.
Pteranodon Was Much Bigger Than Pterodactylus
The largest species of the late Cretaceous Pteranodon attained wingspans of up to 30 feet, much larger than any flying birds alive today. By comparison, Pterodactylus (which lived tens of millions of years earlier) was a relative runt, the wingspans of the largest individuals spanning only eight feet or so (and most species boasting wingspans of only two or three feet, well within the current avian range.) There was much less difference in the weight of these pterosaurs; both were extremely light, in order to generate the maximal amount of lift needed to fly.05of 10
There Are Dozens of Named Pterodactyus and Pteranodon Species
Pterodactylus was unearthed way back in 1784, and Pteranodon in the mid-19th century. As so often happens with such early discoveries, subsequent paleontologists assigned numerous individual species to each of these genera, with the result that the taxonomies of Pterodactylus and Pteranodon are as tangled as a bird's nest. Some species may be genuine; others may turn out to be nomen dubia (that is, garbage) or better assigned to another genus of the pterosaur.06of 10
No One Knows How Pteranodon Used Its Skull Crest
Besides its size, the most distinctive feature of Pteranodon was its long backward-pointing, but extremely light skull crest, the function of which remains a mystery. Some paleontologists speculate that Pteranodon used this crest as a mid-flight rudder (perhaps it anchored a long flap of skin), while others insist it was strictly a sexually selected characteristic (that is, male Pteranodons with the largest, most elaborate crests were more attractive to females, or vice-versa).
Pteranodon and Pterodactylus Walked on Four Legs
One of the major differences between ancient, lizard-skinned pterosaurs and modern, feathered birds is that pterosaurs most likely walked on four legs when they were on land, compared to birds' strictly bipedal postures. How do we know this? By various analyses of Pteranodon and Pterodactylus fossilized footprints (as well as those of other pterosaurs) which have been preserved alongside ancient dinosaur track marks of the Mesozoic Era.08of 10
Pterodactylus Had Teeth, Pteranodon Didn't
Besides their relative sizes, one of the major differences between Pterodactylus and Pteranodon is that the former pterosaur possessed a small number of teeth, while the latter was completely toothless. This fact, combined with Pteranodon's vaguely albatross-like anatomy, has led paleontologists to conclude that this larger pterosaur flew along the seashores of late Cretaceous North America and fed mostly on fish--while Pterodactylus enjoyed a more varied (but less impressively sized) diet.09of 10
Male Pteranodons Were Bigger Than Females
In relation to its mysterious crest, Pteranodon is believed to have exhibited sexual dimorphism, the males of this genus being significantly bigger than the females, or vice-versa (interestingly, in many modern bird species, the females are significantly bigger and more colorful than the males). The dominant Pteranodon sex also had a larger, more prominent crest, which may have taken on bright colors during mating season. As for Pterodactylus, the males and females of this pterosaur were comparably sized, and there's no conclusive evidence for sexual differentiation.10of 10
Neither Pterodactylus Nor Pteranodon Were the Biggest Pterosaurs
A lot of the buzz originally generated by the discovery of Pteranodon and Pterodactylus has been co-opted by the truly gigantic Quetzalcoatlus, a late Cretaceous pterosaur with a wingspan of 35 to 40 feet (about the size of a small plane). Fittingly, Quetzalcoatlus was named after Quetzalcoatl, the flying, feathered god of the Aztecs. (By the way, Quetzalcoatlus may itself one day be supplanted in the record books by Hatzegopteryx, a comparably sized pterosaur represented by frustratingly fragmentary fossil remains!)