biology

Zhanghenglong

Zhanghenglong 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 Zhanghenglong rather than just read about it. In short: Zhanghenglong is an extinct genus of herbivorous hadrosauroid iguanodont dinosaur known from the Late Cretaceous (middle Santonian stage) Majiacun Formation in Xixia County of Henan Province, China. It contains a single species, Zhanghenglong yangchengensis, represented by a disarticulated and partial cranium and postcranial skeleton.

Key takeaways

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

Reference excerpt

Zhanghenglong is an extinct genus of herbivorous hadrosauroid iguanodont dinosaur known from the Late Cretaceous (middle Santonian stage) Majiacun Formation in Xixia County of Henan Province, China. It contains a single species, Zhanghenglong yangchengensis, represented by a disarticulated and partial cranium and postcranial skeleton.

Discovery and naming

In 2011, at Zhoujiagou in Henan the remains were uncovered of a euornithopod. In 2014, the type species Zhanghenglong yangchengensis was named and described by Xing Hai, Wang Deyou, Han Fenglu, Corwin Sullivan, Ma Qingyu, He Yiming, David Hone, Yan Ronghao, Du Fuming and Xu Xing. The generic name combines the name of the first century Chinese scientist Zhang Heng with long, Mandarin for "dragon". The specific name refers to Yangcheng, an administrative unit during the Eastern Zhou, partially coinciding with the present Henan. The holotype, XMDFEC V0013, was found in the Majiacun Formation dating from the middle Santonian, about eighty-five million years old. It consists of a partial skull and lower jaw, including the right maxilla, the right jugal and the right dentary. The paratype is XMDFEC V0014, a partial skeleton lacking the skull, including five back vertebrae, ribs, a shoulder blade and the right ulna.

Taxonomic status Zhanghenglong is probably a non-hadrosaurid hadrosauroid based on a series of plesiomorphic features present in this taxon. The new genus and species significantly differs from other known members of Hadrosauroidea in having two distinct autapomorphies (strongly deflected posteroventrally posterior third of the maxilla relative to the anterior two thirds of it and dentary teeth with crowns of both median and distally offset primary ridges) and a unique combination of features. Despite the confluence of some plesiomorphic features typical of non-hadrosaurid hadrosauroids, Zhanghenglong possesses some derived characters seen in hadrosaurids, as well as two transitional features that are intermediate between the corresponding plesiomorphic and derived characters of hadrosauroids. This taxon may therefore represent a relatively derived non-hadrosaurid hadrosauroid, and is thought to be one of the closest relatives to Hadrosauridae.

References

Illustrations

Worked examples

Example 1 — a first encounter with Zhanghenglong

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

In research: Zhanghenglong 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 Zhanghenglong 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: Zhanghenglong is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dinosaur genera, Dinosaurs of China, Fossil taxa described in 2014, so understanding it makes those chapters shorter.
In everyday life: Look for Zhanghenglong 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 Zhanghenglong in 20 minutes

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

Frequently asked questions

What is Zhanghenglong in simple terms?

Why does Zhanghenglong 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 Zhanghenglong?

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 Zhanghenglong.