biology

Guanlong

Guanlong 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 Guanlong rather than just read about it. In short: Guanlong (Chinese: 冠龍; lit. 'crown dragon') is an extinct genus of proceratosaurid tyrannosauroid dinosaur from the Late Jurassic (Oxfordian) Shishugou Formation of China. It was first described in 2006 by Xu Xing and colleagues, who found it to represent a new taxon related to Tyrannosaurus.

Key takeaways

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

Reference excerpt

Guanlong (Chinese: 冠龍; lit. 'crown dragon') is an extinct genus of proceratosaurid tyrannosauroid dinosaur from the Late Jurassic (Oxfordian) Shishugou Formation of China. It was first described in 2006 by Xu Xing and colleagues, who found it to represent a new taxon related to Tyrannosaurus. Two individuals are currently known, consisting of a partially complete adult and a nearly complete juvenile.

Discovery

Guanlong was discovered in the Dzungaria area of China by a joint expedition by scientists from the Institute of Vertebrate Paleontology and Paleoanthropology and George Washington University, and named by Xu Xing and others in 2006. Guanlong comes from the Chinese words for "crown" (Chinese: 冠; pinyin: guān) and "dragon" (龍; lóng), referring to the crest. The specific epithet, wucaii (), means "multicoloured" and refers to the colours of rock of the Wucaiwan (五彩灣; 'five-colored bay', 'multicolored bay'), the multi-hued badlands where the creature was found.

At present, Guanlong is known from two specimens, one discovered on top of the other, with three other individual theropod dinosaurs, in the Shishugou Formation. The holotype (IVPP V14531) is a reasonably complete, partially articulated adult skeleton, and was the one on top. Another, immature specimen, the paratype IVPP V14532, is known from fully articulated and nearly complete remains. It was presumed to have been trampled, after death, by the adult. The crest on the skull of the immature specimen is notably smaller and restricted to the forward portion of the snout, while the adult has a larger and more extensive crest. The crests of both specimens are thin, delicate structures that likely served as display organs, possibly for events like mating.

Description

Guanlong was a relatively small theropod, reaching 3–3.5 m (9 ft 10 in – 11 ft 6 in) in length and 125 kg (276 lb) in body mass. Its fossils were found in the Shishugou Formation dating to about 160 million years ago, in the Oxfordian stage of the Late Jurassic period, 92 million years before its well-known relative Tyrannosaurus. This bipedal saurischian theropod shared many traits with its descendants, and also had some unusual ones, like a large crest on its head. Unlike later tyrannosaurs, Guanlong had three long fingers on its hands. Aside from its distinctive crest, it would have resembled its close relative Dilong, and like Dilong may have had a coat of primitive feathers.

Classification

A 2013 study found Guanlong to be in a clade with both Proceratosaurus and Kileskus. Together they formed the family Proceratosauridae with a clade containing Sinotyrannus, Juratyrant and Stokesosaurus. However, in 2014 another study was published, instead finding Stokesosaurus and Juratyrant outside the family, which only included Guanlong, Proceratosaurus, Kileskus and Sinotyrannus. Below is a simplified cladogram of the later analysis, from Fiorillo & Tykoski, 2014.

In 2024, the describers of Alpkarakush recovered Dilong and proceratosaurids (Proceratosaurus and Guanlong) outside Tyrannosauroidea based on their phylogenetic analysis.

Paleobiology

The ages of the two individuals were determined using a histological analysis. The adult was shown to have matured at 7 years of age, and died at the age of 12. The juvenile died at 6, and was still growing. As the individuals are of different ages, some of the changes that took place during growth can be seen. In the juvenile, the crest is restricted to the snout, which is proportionally shorter. The orbit is also larger, the hand comparatively larger, the lower leg is longer, the pubic bone has a less expanded end, and other features found in more derived coelurosaurs and tyrannosauroids. Guanlong possessed a cranial crest, which may have been used for display. It is similar to those of Dilophosaurus and Monolophosaurus, and like those it was highly pneumatized. However, it was more delicate than in the other genera, and also proportionately larger and more elaborate. Structures in Dilophosaurus and Monolophosaurus have also been suggested to be for species recognition, but the more gracile crest of Guanlong is more likely for display purposes.

Illustrations

Worked examples

Example 1 — a first encounter with Guanlong

Start with the simplest possible case. Write down what Guanlong 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 Guanlong 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 Guanlong 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 Guanlong

In research: Guanlong 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 Guanlong 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: Guanlong is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dinosaur genera, Dinosaurs of China, Fossil taxa described in 2006, so understanding it makes those chapters shorter.
In everyday life: Look for Guanlong 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 Guanlong in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Guanlong 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 Guanlong out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Guanlong in simple terms?

Why does Guanlong 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 Guanlong?

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 Guanlong.