biology

Zhuchengtyrannus

Zhuchengtyrannus 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 Zhuchengtyrannus rather than just read about it. In short: Zhuchengtyrannus (meaning "Zhucheng tyrant") is a genus of tyrannosaurid theropod dinosaur from Asia, known from the Campanian stage of the Late Cretaceous of Shandong Province, China. It belongs to the subfamily Tyrannosaurinae, and contains a single species, Zhuchengtyrannus magnus.

Key takeaways

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

Reference excerpt

Zhuchengtyrannus (meaning "Zhucheng tyrant") is a genus of tyrannosaurid theropod dinosaur from Asia, known from the Campanian stage of the Late Cretaceous of Shandong Province, China. It belongs to the subfamily Tyrannosaurinae, and contains a single species, Zhuchengtyrannus magnus.

Discovery and naming

Zhuchengtyrannus was first described and named by David W. E. Hone, Kebai Wang, Corwin Sullivan, Xijin Zhao, Shuqing Chen, Dunjin Li, Shuan Ji, Qiang Ji and Xing Xu in 2011 and the type species is Zhuchengtyrannus magnus. The generic name is derived from the word Zhucheng, which refers to the type locality, and tyrant in reference to its phylogenetic position as a tyrannosaurid. The specific name magnus meaning "great" in Latin refers to the relatively large size of Zhuchengtyrannus. Zhuchengtyrannus is known solely from the holotype ZCDM V0031, a nearly complete right maxilla and associated left dentary (lower jaw, both with teeth) discovered during large scale excavations alongside the Sinankylosaurus holotype in 2008, and is currently housed at the Zhucheng Dinosaur Museum. Casts of the holotype, IVPP FV 1794, are held at the Institute of Vertebrate Paleontology and Paleoanthropology. ZCDM V0031 was collected in the Hongtuya Formation from the Wangshi Group at Zangjiazhuang quarry, Zhucheng City, dating to the Campanian stage, at least 73.5 million years ago. A second tyrannosaurid dentary (ZCDM V0030) and maxilla (ZCDM V0032) have also been collected at Zangjiazhuang quarry. Even though they were not associated with one another, both specimens are different from other tyrannosaurids, including Zhuchengtyrannus, implying the existence of at least one additional tyrannosaurid from the quarry. Apart from the tyrannosaurid material, specimens of Sinoceratops, hadrosaurids (probably Shantungosaurus) and the indeterminate dinosaur Sinankylosaurus were recovered from it. Zhuchengtyrannus was found in an area that was a floodplain in the Cretaceous period and contains one of the highest concentrations of dinosaur bones in the world.

Description

Zhuchengtyrannus was a large carnivorous theropod, and the holotype has been estimated to have been "similar in size and gross morphology to Tarbosaurus", which is about 10 metres (33 ft) in body length and 5 metric tons (5.5 short tons) in body mass. The holotype dentary was significantly smaller than the corresponding bones of one of the largest Tyrannosaurus rex specimens ("Sue").

Zhuchengtyrannus can be distinguished from all other tyrannosaurines by a single autapomorphy, the presence of a horizontal shelf on the lateral surface of the base of the ascending process of the maxilla, and a rounded notch in the anterior margin of the maxillary fenestra. Zhuchengtyrannus also possesses a ventral margin of the antorbital fenestra that lies well above that of the ventral rim of the antorbital fossa. Additionally, the total length of the maxillary fenestra is more than half the distance between the anterior margins of the antorbital fossa and fenestra. Unlike the contemporaneous Tarbosaurus, Zhuchengtyrannus lacks a subcutaneous flange on the posterodorsal part of the jugal ramus of the maxilla, and a ventrally convex palatal shelf that covers the bulges of the roots of the rear teeth in medial view.

Classification

It is possible that several isolated teeth recovered from one of the Zhucheng dinosaur quarries during the 1970s, previously given the name Tyrannosaurus zhuchengensis, belong to this or a related species. The T. zhuchengensis teeth are characterized by serrations that extend all the way to the base of the tooth crown, a feature not seen in any other tyrannosaurine species. All known teeth of Zhuchengtyrannus are too poorly preserved in this area to compare with T. zhuchengensis, but further finds may clarify their relationship.

A phylogenetic analysis published with the description of the tyrannosaurine Lythronax in the journal PLOS One by Loewen et al. 2013, recovered Zhuchengtyrannus as the sister taxon of Tarbosaurus. It also suggests that Zhuchengtyrannus and other currently known Asian tyrannosaurids were part of an evolutionary radiation descending from the same North American stem that later gave rise to Tyrannosaurus rex, recovered as their closest known relative. Below are the results obtained in their phylogenetic analysis: A study by Voris et al in 2020 recovered Zuchengtyrannus as the sister taxon to a clade containing the Maastrichtian genera Tyrannosaurus and Tarbosaurus. A cladogram of their results is reproduced below:

A 2024 study by Dalman and colleagues, incorporating their new species Tyrannosaurus mcraeensis instead found Zhuchengtyrannus to be the closest relative of Tarbosaurus:

Illustrations

Worked examples

Example 1 — a first encounter with Zhuchengtyrannus

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

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

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

Frequently asked questions

What is Zhuchengtyrannus in simple terms?

Why does Zhuchengtyrannus 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 Zhuchengtyrannus?

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 Zhuchengtyrannus.