biology

Gobisaurus

Gobisaurus is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Gobisaurus rather than just read about it. In short: Gobisaurus is an extinct genus of herbivorous basal ankylosaurid ankylosaur from the Lower Cretaceous of China (Nei Mongol Zizhiqu). The genus is monotypic, containing only the species Gobisaurus domoculus.

Key takeaways

Gobisaurus belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Gobisaurus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gobisaurus from memory before moving on to harder problems.

Reference excerpt

Gobisaurus is an extinct genus of herbivorous basal ankylosaurid ankylosaur from the Lower Cretaceous of China (Nei Mongol Zizhiqu). The genus is monotypic, containing only the species Gobisaurus domoculus.

Discovery and naming

The Sino-Soviet Expeditions (1959–1960) discovered an ankylosaurian skeleton in the Gobi Desert of Inner Mongolia near Moartu, in the region of the Alashan Desert. The find was largely neglected until fossils were selected for a travelling exhibition touring the globe between 1990 and 1997, in the context of the China-Canada Dinosaur Project. The postcranial skeleton could not be located but the skull was displayed, informally labelled "Gobisaurus", at the time a nomen nudum. In 2001, Matthew K. Vickaryous, Anthony P. Russell, Philip John Currie and Zhao Xijin named and described the type species Gobisaurus domoculus. The generic name means "Gobi (Desert) lizard," referring to its provenance. The specific name means "hidden from view" in Latin, referring to its being overlooked for three decades. The holotype, IVPP V12563, was found in a layer of the Miaogou Formation (Maortu locality; originally interpreted as the nearby Ulansuhai Formation). Some studies indicate it may date to the Turonian, but others suggest an older date spanning between the Barremian and Albian. It consists of a skull and the as yet undescribed postcranial remains. In 2014, Victoria Arbour concluded that Zhongyuansaurus, the type specimen of which, HGM 41HIII-0002, includes extensive postcranial remains, was a possible junior synonym of Gobisaurus.

Description

Gobisaurus is a large ankylosaurian. The skull measured 46 centimetres (18 in) in length and 45 centimetres (18 in) across. Gobisaurus domoculus shares many cranial similarities with Shamosaurus scutatus, including a rounded squamosal, short squamosal horns, low supraorbital bosses, large elliptical orbital fenestrae and external nares (oval eye sockets and nostrils), the cross-section of the eye sockets being about a fifth of skull length, a deltoid dorsal profile with a narrow rostrum (a narrow, kite-shaped, snout in top view), quadratojugal protuberances (cheek horns), and caudolaterally directed paroccipital processes (extensions of the rear skull pointing to behind and sideways). But the two taxa may be distinguished by differences in the length of the maxillary tooth row (26,6% instead of 40% of total skull length with Gobisaurus), an unfused basipterygoid-pterygoid process in Gobisaurus, the front of the pterygoid being in e vertical position, the presence on an elongate vomerine premaxillary process in Gobisaurus, and the presence of cranial sculpting in Shamosaurus, but not in Gobisaurus. This latter difference was denied by Arbour who concluded that the degree of sculpting was roughly the same. The external nostrils had about 23% of skull length. HGM 41HIII-0002, the holotype of Zhongyuansaurus, preserves a tail club "handle": the vertebrae toward the end of the tail interlock tightly, making the end stiff. However, this specimen does not appear to have a tail club "knob", the bulbous osteoderms seen in derived ankylosaurids.

Phylogeny Gobisaurus was placed in the Ankylosauridae in 2001. Vickaryous et al., 2004 found that a clade formed by Shamosaurus and Gobisaurus is "nested deep within the ankylosaurid lineage as the first successive outgroup to (the subfamily) Ankylosaurinae". Other analyses find a more basal position as the sister species of Shamosaurus. Concluding that Zhongyuansaurus was a probable junior synonym of Gobisaurus, Arbour considered it unnecessary to use the term Shamosaurinae for the clade including just Shamosaurus and Gobisaurus. Gobisaurus in a cladogram simplified from Zheng et al. (2018):

In phylogenetic analyses by Xing et al. (2024), Gobisaurus is recovered as a member of Shamosaurinae or as an ankylosaurid less derived than Shamosaurus. Below are two simplified cladograms from that study:

Illustrations

Gobisaurus: Skull of Gobisaurus — Skull of Gobisaurus

Worked examples

Example 1 — a first encounter with Gobisaurus

Start with the simplest possible case. Write down what Gobisaurus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Gobisaurus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Gobisaurus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Gobisaurus

In research: Gobisaurus appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Gobisaurus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Gobisaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ankylosauridae, Dinosaur genera, Dinosaurs of China, so understanding it makes those chapters shorter.
In everyday life: Look for Gobisaurus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Gobisaurus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gobisaurus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Gobisaurus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gobisaurus in simple terms?

Why does Gobisaurus matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Gobisaurus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Gobisaurus.