biology

Sinraptor

Sinraptor 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 Sinraptor rather than just read about it. In short: Sinraptor () is a genus of metriacanthosaurid theropod dinosaur from the Shishugou Formation China. Sinraptor and its close relatives were among the earliest members of the Jurassic carnosaurian radiation.

Key takeaways

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

Reference excerpt

Sinraptor () is a genus of metriacanthosaurid theropod dinosaur from the Shishugou Formation China. Sinraptor and its close relatives were among the earliest members of the Jurassic carnosaurian radiation. Sinraptor still remains the best-known member of the family Metriacanthosauridae, with some older sources even using the name "Sinraptoridae" for the family.

Discovery and naming

The holotype specimen of Sinraptor was uncovered from the Shishugou Formation during a joint Chinese/Canadian expedition to the northwestern Chinese desert in 1987 and described by Philip J. Currie and Zhao Xijin in 1994. Standing nearly 3 meters (9.8 feet) tall and measuring roughly 7.6 meters (25 feet) in length, two species of Sinraptor have been named. S. dongi, the type species, was described by Currie and Zhao in 1994. A second species, originally named Yangchuanosaurus hepingensis by Gao in 1992, may actually represent a second species of Sinraptor. Whether or not this is the case, Sinraptor and Yangchuanosaurus were close relatives and are classified together in the family Metriacanthosauridae.The name Sinraptor comes from the Latin prefix "Sino", meaning Chinese, and "raptor", meaning robber. The specific name dongi honours Dong Zhiming. Despite its name, Sinraptor is not related to dromaeosaurids (often nicknamed "raptors") like Velociraptor. Instead, it was a carnosaur distantly related to Allosaurus.

Description

Gregory S. Paul proposed that S. dongi would reach 8 metres (26 ft) in length and 1.3 metric tons (1.4 short tons) in body mass, while Holtz estimated it to be 8.8 metres (29 ft) in length. A massive tooth 10 cm (4 in) in length was found from the same stratigraphic level as Sinraptor and possibly belonged to this taxon. If the tooth belonged to Sinraptor, then it would have been one of the largest theropods of the Jurassic,with this specimen possibly measuring up to 12 metres (39 ft) in length. The skull length is estimated at 90 centimetres (35 in) in length. The holotype of S. dongi was a subadult and thus not fully grown.

The dentition of Sinraptor was very similar to that of Allosaurus and indicated that it likely would have preyed upon medium-sized dinosaurs such as stegosaurs (such as Jiangjunosaurus junggarensis) by using its blade-like teeth to inflict massive, fatal wounds.

Classification Sinraptor hepingensis, formerly referred to as Yangchuanosaurus, is a second species referred to this genus. However, the identity of this species within Sinraptor is questioned by other paleontologists, and the describers of Alpkarakush included this species within Yangchuanosaurus based on their phylogenetic analysis in 2024.

Paleopathology Sinraptor dongi skull specimen IVPP 10600 exhibits "a variety of gently curving tooth drags or gouges, shallow, circular punctures and one fully penetrating lesion." One rib was broken and healed via telescoping of its capitular shaft.

References

External links The original Chinese text of Gao (1992)'s description of Yangchuanosaurus hepingensis, with pictures.

Illustrations

Worked examples

Example 1 — a first encounter with Sinraptor

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

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

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

Frequently asked questions

What is Sinraptor in simple terms?

Why does Sinraptor 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 Sinraptor?

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 Sinraptor.