Tanystropheus

Name meaning:

Long-jointed

Period of life:

247–230 million years ago

Period:

Triassic period

Habitat:

Marine environment

Taxonomy:

Archosaurs

Countries:

Triassic period Tanystropheus | 3D Dinopedia

Shringasaurus

Cyamodus

Tanystropheus (247–230 million years ago)

What the name means: “Long-jointed” (from the Greek words τανυ~ “long” + στροφευς “jointed”).

During the Triassic period, approximately 247–230 million years ago, Tanystropheus roamed the Earth, possessing one of the most unusual necks among known reptiles. This neck, composed of 13 vertebrae, was reinforced by elongated cervical ribs and was longer than the body and tail combined. Among the group of Middle Triassic reptiles belonging to archosauromorphs, Tanystropheus can be considered one of the most thoroughly studied and described taxa. It is known from numerous fossils, including nearly complete skeletons. Some species may have reached a total length of 6 meters, making it one of the longest archosauromorphs.

The skull of Tanystropheus varied depending on the species. In Tanystropheus longobardicus, it was narrow and triangular, with tricuspid teeth in the posterior part of the jaw, adapted for holding slippery prey. In Tanystropheus hydroides, the skull was broader and flatter, with a series of large, curved, single-cusped fangs resembling those of plesiosaurs. In both species, the nostrils were positioned on the upper part of the snout, indicating a semi-aquatic lifestyle.

The body of Tanystropheus was elongated and relatively lightweight. The forelimbs were significantly smaller than the hind limbs, shifting the center of mass toward the pelvis and making the animal more stable on land. The tail was long and powerful, capable of producing strong propulsion in water.

The internal anatomy of Tanystropheus is also of considerable interest. Its lungs were multi-chambered, allowing efficient respiration despite the extremely long neck. Studies of the inner ear indicate that Tanystropheus possessed well-developed hearing.

Fossil remains of Tanystropheus have been found in various regions of the world, including Europe, Asia, and North America. The most notable discoveries come from the Besano Formation at Monte San Giorgio, on the border of Italy and Switzerland. Two species have been identified there: the smaller Tanystropheus longobardicus and the larger Tanystropheus hydroides.

The lifestyle of Tanystropheus has been the subject of extensive debate. Its neck was relatively stiff and inflexible, suggesting a strong association with water. However, its limbs and tail lack many typical aquatic adaptations and closely resemble those of terrestrial reptiles. Recent studies support an intermediate interpretation, reconstructing Tanystropheus as an animal capable of locomotion both on land and in water. Most researchers today consider it likely that this reptile was a piscivorous ambush predator.

Interestingly, Tanystropheus lacked many adaptations typical of marine reptiles — for example, a laterally compressed tail (its tail was flattened, but dorsoventrally, more similar to that of a beaver), and its forelimbs were much smaller than the hind limbs, which is also unusual for marine reptiles, both extinct (such as plesiosaurs) and modern (such as leatherback turtles). Overall, Tanystropheus was an extraordinary organism: externally resembling a dinosaur, similar in lifestyle and diet to plesiosaurs, and with a mode of locomotion reminiscent of frogs. Despite these unusual features, it was a successful taxon, as indicated by its wide geographic distribution and long temporal range.

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