biology

Polysternon

Polysternon 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 Polysternon rather than just read about it. In short: Polysternon is a genus of turtles in the extinct family Bothremydidae. It was described by Portis in 1882, and contains the species P. provinciale (originally placed in the genus Pleurosternon), which existed during the Cretaceous of what is now France and a new species, P. isonae, from the Late Maastrichtian of Spain.

Key takeaways

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

Reference excerpt

Polysternon is a genus of turtles in the extinct family Bothremydidae. It was described by Portis in 1882, and contains the species P. provinciale (originally placed in the genus Pleurosternon), which existed during the Cretaceous of what is now France and a new species, P. isonae, from the Late Maastrichtian of Spain. The species epithet of P. isonae refers to the municipality Isona i Conca Dellà in Catalonia, where the type specimen was discovered in the Tremp Formation.

Species Polysternon provinciale Matheron, 1869 Polysternon isonae Marmi et al., 2012

Distribution Fossils of Polysternon have been found in:

Argiles et Grès à Reptiles and Rognacian Formations - France Vitoria, Sierra Perenchiza and Tremp Formations - Spain

References

External links Polysternon at the Paleobiology Database

Illustrations

Worked examples

Example 1 — a first encounter with Polysternon

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

In research: Polysternon 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 Polysternon 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: Polysternon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous France, Cretaceous Spain, Extinct turtles, so understanding it makes those chapters shorter.
In everyday life: Look for Polysternon 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Polysternon in 20 minutes

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

Frequently asked questions

What is Polysternon in simple terms?

Why does Polysternon 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 Polysternon?

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 Polysternon.