science

Xianshou

Xianshou is a science 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 Xianshou rather than just read about it. In short: Xianshou is a genus of gliding haramiyidan synapsid known from the Oxfordian stage of the Jurassic period, approximately 160 million years ago. Two species, X. linglong and X. songae, are known from fossils of the Tiaojishan Formation in the Liaoning province of China.

Key takeaways

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

Reference excerpt

Xianshou is a genus of gliding haramiyidan synapsid known from the Oxfordian stage of the Jurassic period, approximately 160 million years ago. Two species, X. linglong and X. songae, are known from fossils of the Tiaojishan Formation in the Liaoning province of China.

Etymology The genus name is derived from Chinese xiān (仙), meaning "immortal" or "celestial being", and shòu (獸), meaning "creature" or "beast". The specific name linglong is derived from both the Chinese word for "exquisite" (玲瓏), and from the name of the town Linglongta, where the holotype was discovered. X. songae is named for the collector of the specimen, Rufeng Song.

Description X. linglong is believed to have weighed 83 grams (2.9 oz) in life. It can be distinguished from X. songae and Shenshou by the sharper cusps and ridges of its upper molars, and by larger size. X. songae is estimated to have weighed around 40 grams (1.4 oz). More recent study of Xianshou suggests that, like the closely related Maiopatagium and Vilevolodon, it may have had a patagium and the ability to glide. No patagium is preserved in Xianshou fossils, but the morphology of the limbs and pes is most similar to those of extant gliding mammals.

Phylogeny The following phylogenetic analysis was recovered by the description of Xianshou.

References

Illustrations

Worked examples

Example 1 — a first encounter with Xianshou

Start with the simplest possible case. Write down what Xianshou claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Xianshou 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 Xianshou 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 Xianshou

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

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

Frequently asked questions

What is Xianshou in simple terms?

Why does Xianshou matter?

Because it connects several science 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 Xianshou?

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 Xianshou.