Azhdarchidae

Azhdarchidae is a special group of flying reptiles called pterosaurs that lived a very long time ago during what scientists call the Late Cretaceous period. Their name comes from a word in Persian mythology, azhdar, which describes a dragon-like creature. These pterosaurs were some of the biggest animals ever to fly in the sky, but scientists have also found smaller ones that were about the size of a cat.

At first, scientists thought azhdarchids were part of another group called Pteranodontidae. But in 1984, a scientist named Nesov gave them their own name, Azhdarchinae, to include famous pterosaurs like Azhdarcho, Quetzalcoatlus, and Titanopteryx (which is now called Arambourgiania). They were among the last pterosaurs to live on Earth and were very successful, found all over the world.

We used to believe that by the end of the Cretaceous period, most pterosaur families had disappeared, except for the azhdarchids. But new discoveries show that many other types of pterosaurs were still around during the latest part of the Cretaceous period. These amazing creatures show just how diverse and widespread the pterosaurs were before they went extinct.

Description

Azhdarchids had very long legs and extremely long necks made of stretched neck bones. Most of what we know about them comes from these special neck bones. Some well-known azhdarchids include Zhejiangopterus and Quetzalcoatlus. They also had big heads and long, pointed jaws. There are two main types: one with shorter, blunter beaks and another with longer, thinner beaks.

Scientists once thought azhdarchids skimmed over water like some birds, but newer studies show they probably lived more on land, similar to modern storks and ground hornbills. Large azhdarchids likely ate small animals, such as baby dinosaurs. One strong azhdarchid, Hatzegopteryx, might have hunted bigger prey. Another azhdarchid, Alanqa, may have eaten hard-shelled foods like shellfish.

Azhdarchids ranged from medium to very large sizes, with some reaching wingspans of 10–12 metres (33–39 ft). Recently, a new, unnamed azhdarchid found in Transylvania might be the largest known. Nicknamed "Dracula" by scientists, it is displayed in the Altmühltal Dinosaur Museum in Bavaria and is estimated to have a wingspan of 12–20 m (39–66 ft).

Systematics

Azhdarchids were first thought to be close relatives of Pteranodon because of their long, toothless beaks. Some scientists later suggested they were more like the toothy ctenochasmatids, but this idea is no longer used. Today, most agree that azhdarchids were closely related to pterosaurs such as chaoyangopterids, thalassodromids, and tapejarids, all part of the larger group Azhdarchoidea.

Different studies have tried to understand how azhdarchids are related to each other. Some place them in groups based on size, with smaller and larger types. Recent work suggests new ways to group these pterosaurs, with some being closer to certain species than others. The family Azhdarchidae has seen many changes, with some species moving to different groups based on new discoveries.