Lirainosaurus: Unveiling the Slender Lizard of the Late Cretaceous

Let’s embark on a journey back to the Late Cretaceous Period, where Lirainosaurus, a lesser-known yet fascinating titanosaur sauropod, roamed on Earth. This slender giant, whose name translates to ‘Slender Lizard’ from the Basque language, offers a unique window into the world of the Titanosauria. Discovered in the picturesque region of Laño, Spain, Lirainosaurus astibiae, as it’s scientifically known, presents an intriguing chapter in the story of Earth’s ancient inhabitants.

Lirainosaurus Key Facts

Meaning of nameSlender Lizard
Type SpeciesLirainosaurus astibiae
When it Lived83.5 to 66.0 MYA
PeriodLate Cretaceous
EpochCampanian to Maastrichtian
Length13.0 to 20.0 feet
Height2.2 to 4.4 tons
WeightApproximately 4.5 feet
First Discovery1999 by German Tendaurus Expedition
Described by1999 by Jose Sanz, JE Powell, J Le Loeuff, R Martínez and Pereda Suberbiola
HolotypeMCNA 7458
Location of first findLaño, Spain
Also found inFrance

Lirainosaurus Origins, Taxonomy and Timeline

Lirainosaurus, a name derived from the Basque word ‘lirain’ meaning slender, and the Greek ‘sauros’ for lizard, aptly describes this sauropod’s physique. Belonging to the Titanosauria, this genus stands out for its distinct characteristics. The type species, Lirainosaurus astibiae, is the sole member of the genus to this date.

This sauropod’s timeline stretches across the Late Campanian to the Early Maastrichtian Epochs of the Late Cretaceous Period, approximately 83.5 to 66.0 million years ago. This era was a time of significant geological and climatic changes, which undoubtedly influenced the evolution and lifestyle of Lirainosaurus.

Discovery & Fossil Evidence

The first discovery of Lirainosaurus remains in 1999 by the German Tendaurus Expedition in Laño, Spain, marked a significant addition to the Titanosauria. Further finds in France have expanded our understanding of this dinosaur’s geographical range. The fossils, primarily consisting of vertebrae and limb bones, offer insights into the sauropod’s structure and lifestyle. The holotype, MCNA 7458, is particularly notable for its well-preserved condition.

Lirainosaurus Size and Description

Lirainosaurus, presents an intriguing contrast to the typically larger dinosaurs of its group. Its relatively modest size offers a fresh perspective on the diversity within the Titanosaurids.

This sauropod’s physical characteristics are marked by a long neck and tail, a robust body, and sturdy limbs, all harmonizing with its quadrupedal stance. The vertebrae and limb bones found suggest a creature well-adapted to its herbivorous lifestyle, capable of reaching high vegetation with ease.

Size and Weight of Type Species

The type species, Lirainosaurus astibiae, was notably smaller compared to its colossal relatives. It measured approximately 13.0 feet long, with the largest individuals possibly reaching up to 20.0 feet in length. In terms of weight, this slender sauropod tipped the scales at about 2.2 to 4.4 tons. This relatively light weight, combined with its size, implies a nimble and efficient lifestyle, possibly aiding in its survival during the Late Cretaceous Period.

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The Dinosaur in Detail

Lirainosaurus, a genus established on a fascinating array of fossil evidence, offers a detailed glimpse into the anatomical and evolutionary nuances of the Late Cretaceous sauropods.

Fossil Evidence and Anatomical Features

This genus was initially identified based on a collection of fossils including a skull fragment, isolated teeth, several vertebrae (with the holotype being an anterior caudal vertebra), and appendicular bones. These were all unearthed from the Late Cretaceous deposits of Laño, northern Spain. Further discoveries in the same region, as described by Diaz et al. in 2013, added to this collection with cervical, dorsal, and caudal vertebrae, dorsal ribs, and a haemal arch, all attributed to Lirainosaurus.

Distinguishing Anatomical Features

Lirainosaurus is distinguished by unique characteristics (diagnostic characters), some of which are autapomorphies (aka features exclusive to the taxon). Notably, it possesses a lamina in the interzygapophyseal fossa of the most proximal caudal vertebrae and a distinct spinopostzygapophyseal structure in the posterior caudal vertebrae that is not posteriorly projected.

Phylogeny and Evolutionary Significance

The combination of characters present in the new axial remains supports the classification of Lirainosaurus as a derived lithostrotian titanosaur closely related to the Saltasaurinae. However, further research, including an unpublished SVPCA abstract from 2016, suggests that Lirainosaurus is more closely related to Alamosaurus and Opisthocoelicaudia than to Saltasaurus. This was further refined in 2018 by Diez Diaz and collegues, who established the Lirainosaurinae to accommodate Lirainosaurus, along with Ampelosaurus and Atsinganosaurus, marking a significant step in understanding the evolutionary tree of titanosaurs.

Contemporary Dinosaurs

Ampelosaurus, a fellow titanosaur, was like the towering oak to Lirainosaurus’ modest shrub. These gentle giants likely coexisted in a sort of gentle tension, not direct competitors but certainly aware of each other’s presence. They probably frequented the same dining spots, where the leafy buffet was abundant enough to sustain their massive sizes, yet their interactions were more like distant neighbors rather than close companions.

In this late cretaceous drama, Paronychodon, a small theropod those remains where found in North America and Central Asia, played a curious role. While Lirainosaurus peacefully munched on high branches, Paronychodon might have been skulking in the underbrush, a mere spectator to the titanic herbivores. Hoiwever, this small, perhaps scavenging dinosaur, was no direct threat to our main character.

Then there was Telmatosaurus, a hadrosaur, roughly the same size as Lirainosaurus. Their paths might have crossed near water sources, where both would venture to quench their thirst. These encounters were probably peaceful, yet there was an unspoken competition for resources. Both herbivores, they were likely to have a mutual understanding of sorts. Acknowledging each other’s needs and boundaries as they coexisted in a shared environment.

Lastly, Paludititan, another titanosaur contemporary, shared the landscape with Lirainosaurus. Paludititan, and was possibly larger and more robust. Their interactions, while not aggressive, could have been akin to a subtle dance of dominance and respect. Lirainosaurus, while not as imposing, had its own niche, perhaps feeding in areas where the larger Paludititan couldn’t reach. This dynamic, a blend of competition and coexistence, highlights the intricate web of relationships in nature. Defining Lirainosaurus’ existence in its rich, cretaceous world.

Interesting Points about Lirainosaurus

Lirainosaurus in its Natural Habitat

Lirainosaurus thrived in the diverse ecosystems of the Late Cretaceous. This period was characterized by warm climates, lush vegetation, and a variety of flora that supported its herbivorous diet. As a quadrupedal sauropod, it likely played a significant role in shaping its environment, possibly clearing pathways through dense vegetation. Its social behavior, whether solitary or herd-based, remains a subject of interest among paleontologists.

Frequently Asked Questions

What does the name Lirainosaurus mean?

Lirainosaurus translates to ‘Slender Lizard’ based on the Basque language. This is a reflection of its physical build and paying a tribute to an ancient but still living language.

When was Lirainosaurus discovered?

It was first discovered in 1999 in Laño, Spain.

What type of dinosaur is Lirainosaurus?

It is a sauropod, specifically a member of the titanosaur.

Where were Lirainosaurus fossils found?

Fossils have been found in Spain and France.

What did Lirainosaurus eat?

As a herbivore, it likely fed on high vegetation.

How did Lirainosaurus move?

It was quadrupedal, moving on all four limbs.


The information in this article is based on various sources, drawing on scientific research, fossil evidence, and expert analysis. The aim is to provide a comprehensive and accurate overview of Lirainosaurus. However, please be aware that our understanding of dinosaurs and their world is constantly evolving as new discoveries are made.

Article last fact-checked: Joey Arboleda, 01-06-2024

Featured Image Credit: pedro._.salas via Instagram