biology

Parvicursor

Parvicursor 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 Parvicursor rather than just read about it. In short: Parvicursor (meaning "small runner") is a genus of very small alvarezsaurid maniraptoran dinosaur that lived during the Late Cretaceous period of Mongolia. It had long, slender legs adapted for fast running.

Key takeaways

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

Reference excerpt

Parvicursor (meaning "small runner") is a genus of very small alvarezsaurid maniraptoran dinosaur that lived during the Late Cretaceous period of Mongolia. It had long, slender legs adapted for fast running.

Discovery and naming The holotype PIN no. 4487/25, mostly consisting of vertebrae, the pelvis and the right hindlimb, was discovered in 1992 and described in 1996. It was discovered in Barun Goyot Formation of Khulsan, Mongolia, dated at approximately 72 million years old.

Description At only about 39 centimetres (15 in; 1.28 ft) from snout to end of tail, and 162 g (5.7 oz) in weight, it was initially seen as one of the smallest non-avian dinosaurs known from an adult specimen. However, in 2022 its holotype was concluded to represent a juvenile individual.

Like other members of the family Alvarezsauridae, the forelimbs of Parvicursor were short and stubby, with hands all but completely reduced to a single large claw, possibly useful for opening tough termite mounds or other types of digging. It is unlikely that the claw could have served much for defense, as it was short and not adapted for flexible movements — it is more likely it would do as the animal's name implies: cursor means runner. Close relatives include Shuvuuia and Mononykus, and together with these it is classified in the alvarezsaurid subfamily Parvicursorinae.

Taxonomy There may be a second, yet-unnamed, species of Parvicursor. Two specimens of tiny alvarezsaurids were described by Suzuki et al. in 2002. These authors considered the specimens to be juvenile Shuvuuia, which lived in the same formation. However, a study by Nick Longrich and Phil Currie in 2009 suggested that several characters of the skeleton, including fused wrist and pelvic bones, indicated that these specimens were in fact adults of a tiny alvarezsaurid species. A phylogenetic analysis found that they grouped together with Parvicursor, and the authors provisionally referred them to Parvicursor sp. pending further study. It has been suggested that Linhenykus and Ceratonykus may be junior synonyms of Parvicursor.

Phylogeny Parvicursor in a cladogram after Fowler et al. (2020):

References

Illustrations

Worked examples

Example 1 — a first encounter with Parvicursor

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

In research: Parvicursor 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 Parvicursor 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: Parvicursor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alvarezsauridae, Baruungoyot Formation, Dinosaur genera, so understanding it makes those chapters shorter.
In everyday life: Look for Parvicursor 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 Parvicursor in 20 minutes

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

Frequently asked questions

What is Parvicursor in simple terms?

Why does Parvicursor 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 Parvicursor?

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 Parvicursor.