biology

Ningyuansaurus

Ningyuansaurus 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 Ningyuansaurus rather than just read about it. In short: Ningyuansaurus is a pennaraptoran dinosaur genus. It contains the single species Ningyuansaurus wangi, known from a fossil specimen from the Early Cretaceous Yixian Formation (Aptian stage, 124.6 Ma ago) of Jianchang, western Liaoning Province, People's Republic of China.

Key takeaways

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

Reference excerpt

Ningyuansaurus is a pennaraptoran dinosaur genus. It contains the single species Ningyuansaurus wangi, known from a fossil specimen from the Early Cretaceous Yixian Formation (Aptian stage, 124.6 Ma ago) of Jianchang, western Liaoning Province, People's Republic of China. It was originally thought to be the basalmost species of oviraptorosaur, based on its long skull and a greater number of teeth in comparison to any other known oviraptorosaur. However, later research showed that it is a member of Halszkaraptorinae. The generic name Ningyuansaurus is derived from Ningyuan, an ancient name for Xingcheng City. The specific name honors Wang Qiuwu, the private owner of the specimen who donated it for scientific study. The specimen is now in the Confuciusornis Museum in Xingcheng.

Description The only known fossil specimen of N. wangi is notable for having a large number of teeth compared to more advanced oviraptorosaurs, but the teeth in the back of the upper jaw (maxilla) are still reduced in number compared to most other non-avialan theropods. The reduced number of maxillary teeth in Ningyuansaurus is shared with the scansoriopterygids and other basal oviraptorosaurs such as Incisivosaurus. Though the skull is poorly preserved, the specimen preserved at least 14 teeth in the lower jaw (dentary) and 10 teeth in the upper jaw, four in the premaxilla and six in the maxilla. The teeth were closely packed together and lacked serrations. The eyes were relatively large. The skull was generally triangular in shape but longer than other basal oviraptorosaurs like Caudipteryx, with a straight lower jaw unlike most other oviraptorosaurs. The arms were short, with longer upper arms (humeri) than lower arms (ulna). The legs were long, and the upper leg (femur) was longer than the pelvic bones. The tail was relatively long and feather impressions were found near the tip. Additional feather impressions were identified along the neck.

Phylogeny Ji et al., 2012 considered Ningyuansaurus a basal member of Oviraptorosauria. However, some traits, such as the low iliofemoral ratio, low ischiopubic ratio and enlarged pedal ungual II are more similar to paravians. While a 2016 study recovered it as an oviraptorosaur, the only non-oviraptorosaur taxa are Archaeopteryx, Velociraptor and Herrerasaurus and the study does not recover a paravian Velociraptor. The 2019 description of Hesperornithoides, which contains many oviraptorosaurs, recovers Ningyuansaurus as the sister taxon of Mahakala within Halszkaraptorinae:

In their phylogenetic analyses, Cau and Madzia (2021) placed Ningyuansaurus within varied positions. While the implied weighting parsimony analyses recovered it as a basal oviraptorosaur in agreement with Ji et al. (2012), the unweighted parsimony analyses recovered Ningyuansaurus within Sinovenatorinae as reproduced below:

Diet Numerous small oval-shaped structures were found in the body cavity of the type specimen, each 10 millimetres (0.39 in) or less in diameter. These may be the remains of seeds, indicating that N. wangi was at least partially a seed-eater.

See also Timeline of oviraptorosaur research

References Q. Ji, J.-c. Lü, X.-f. Wei and X.-r. Wang. 2012. A new oviraptorosaur from the Yixian Formation of Jianching, western Liaoning Province, China. Geological Bulletin of China 31(12):2102-2107

Worked examples

Example 1 — a first encounter with Ningyuansaurus

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

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

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

Frequently asked questions

What is Ningyuansaurus in simple terms?

Why does Ningyuansaurus 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 Ningyuansaurus?

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 Ningyuansaurus.