biology

Machairasaurus

Machairasaurus 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 Machairasaurus rather than just read about it. In short: Machairasaurus is a genus of oviraptorid dinosaur which was found in the Upper Cretaceous Bayan Mandahu Formation, China. Discovery During the Sino-Canadian expeditions of 1988 and 1990 some skeletons of unknown oviraptorosaurians were discovered by Philip J.

Key takeaways

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

Reference excerpt

Machairasaurus is a genus of oviraptorid dinosaur which was found in the Upper Cretaceous Bayan Mandahu Formation, China.

Discovery During the Sino-Canadian expeditions of 1988 and 1990 some skeletons of unknown oviraptorosaurians were discovered by Philip J. Currie in Inner Mongolia. Based on two of these a new genus was named and described by Nicholas Longrich, Philip Currie, and Dong Zhiming in 2010 with the type species Machairasaurus leptonychus. The generic name is derived from Greek μάχαιρα (makhaira), "short scimitar". The specific name is derived from Greek λεπτός (leptos), "slender", and ὄνυξ (onyx), "claw". The species name as a whole refers to the sabre-like claws of the hand. The holotype, IVPP V15979, was found in layers of the Bayan Mandahu dating from the late Campanian. It mainly consists of a left front limb, including the lower end of the lower arm, two carpal bones, and a complete hand.Some fragmentary foot elements are also known. The other find is the paratype, IVPP V15980, consisting of a very fragmentary skeleton including tail vertebrae, chevrons, ribs, phalanges of the hands, fragments of the second and fourth metatarsals, and pedal phalanges. Five oviraptorid specimens associated with a nest, the female having been found brooding near the eggs, may belong to Machairasaurus.

Description

Machairasaurus was a small bipedal theropod, measuring around 1.5 m (4.9 ft) long. The describers established a single autapomorphy, unique derived trait: the hand claws are very elongated and blade-like in side view, with a length four times that of the joint height. The long claws would be proof that basal oviraptorids used their hands to pull down branches; the more curved claws of more derived forms would have served to dig up roots. In 2010, Machairasaurus was assigned to the Oviraptoridae, more precisely to the Ingeniinae. It formed a smaller clade with Heyuannia spp., Conchoraptor, and Nemegtomaia.

Illustrations

Worked examples

Example 1 — a first encounter with Machairasaurus

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

In research: Machairasaurus 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 Machairasaurus 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: Machairasaurus 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 Machairasaurus 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 Machairasaurus in 20 minutes

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

Frequently asked questions

What is Machairasaurus in simple terms?

Machairasaurus is a genus of oviraptorid dinosaur which was found in the Upper Cretaceous Bayan Mandahu Formation, China. Discovery During the Sino-Canadian expeditions of 1988 and 1990 some skeletons of unknown oviraptorosaurians were discovered by Philip J.

Why does Machairasaurus 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 Machairasaurus?

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 Machairasaurus.