science

Hemipristis serra

Hemipristis serra is a science 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 Hemipristis serra rather than just read about it. In short: Hemipristis serra is an extinct species of weasel shark which existed during the Miocene epoch to the Late Middle Pleistocene epoch. It was described by Louis Agassiz in 1843.

Key takeaways

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

Reference excerpt

Hemipristis serra is an extinct species of weasel shark which existed during the Miocene epoch to the Late Middle Pleistocene epoch. It was described by Louis Agassiz in 1843. While today's snaggletooth shark is not very large or dangerous, Hemipristis serra, which lived in the Atlantic Ocean mainly during the Oligocene and Miocene with relict populations surviving up to the Late Middle Pleistocene in Sundaland (Modern day Java, Indonesia) was considerably larger than its modern-day relative and had much larger teeth. Its total length is estimated to be 6 metres (20 ft). Marks made by the teeth of H. serra are often found on the bones of the dugong Metaxytherium leading some scientists to hypothesize that H. serra specialized in preying on these sirenians. In the Gatun Formation of Panama, H. serra was contemporary with pups of the large lamniform shark Otodus megalodon, and both it and the great hammerhead are theorized to have preyed on the pups of this larger shark due to their presence within the formation. The unusual teeth of Hemipristis serra are highly prized by collectors because they are often found in sediments in Southern Florida that yield extremely colorful fossil shark teeth. Their outstandingly large serrations make it a favorite and unique collectible fossil. Little else is known about the general appearance of H. serra, as there are no known fossils preserving its cartilaginous skeleton at present.

References

Illustrations

Worked examples

Example 1 — a first encounter with Hemipristis serra

Start with the simplest possible case. Write down what Hemipristis serra claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Hemipristis serra 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 Hemipristis serra 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 Hemipristis serra

In research: Hemipristis serra appears in science 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 Hemipristis serra 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: Hemipristis serra is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinct animals of Indonesia, Fossil taxa described in 1843, Hemipristis, so understanding it makes those chapters shorter.
In everyday life: Look for Hemipristis serra 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 Hemipristis serra in 20 minutes

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

Frequently asked questions

What is Hemipristis serra in simple terms?

Hemipristis serra is an extinct species of weasel shark which existed during the Miocene epoch to the Late Middle Pleistocene epoch. It was described by Louis Agassiz in 1843.

Why does Hemipristis serra matter?

Because it connects several science 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 Hemipristis serra?

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 Hemipristis serra.