science

Palaeocarcharodon

Palaeocarcharodon 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 Palaeocarcharodon rather than just read about it. In short: Palaeocarcharodon, also known as the pygmy white shark, is a genus of shark within the family Cretoxyrhinidae, that lived about 61.7 to 55.8 Ma during the Middle Paleocene and Early Eocene. It currently contains a sole species P. orientalis.

Key takeaways

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

Reference excerpt

Palaeocarcharodon, also known as the pygmy white shark, is a genus of shark within the family Cretoxyrhinidae, that lived about 61.7 to 55.8 Ma during the Middle Paleocene and Early Eocene. It currently contains a sole species P. orientalis. An additional species, P. landanensis, is now considered a possible synonym of P. orientalis.

Taxonomy

History As is the case with most sharks, the classification of Palaeocarcharodon is still debated. Sinzow (1899) named the shark as a new species of the genus Carcharodon, as C. orientalis, since the teeth were serrated and had features similar to those of the modern Great white shark (Carcharodon carcharias). In addition to C. orientalis, another very close species was suggested, C. landanensis, which would have more serrations on the teeth, with the cusps more reduced or almost vestigial, being found in more recent layers in Morocco and Europe, while C. orientalis was found in intermediate or recent layers. However, soon after, in 1960 it was suggested that "C." orientalis and "C." landanensis would belong to a new genus, Palaeocarcharodon. In 2013, it was suggested that P. landanensis could be a senior synonym of P. orientalis, among other older articles, since many of the proposed differences between the two were inconsistent or appeared in some specimens of P. orientalis. However, this idea is still debated, as many of these articles were not peer-reviewed, though the current consensus is that P. orientalis is the only valid and definitive species of the genus, with new species potentially existing, but still under debate. In the same year, it was theorized that Palaeocarcharodon was a member of Otodontidae, however, currently many recent papers place it in the family Cretoxyrhinidae. Some teeth found in Russia, in Volgograd, show Palaeocarcharodon without serrations, usually classified as Palaeocarcharodon cf. orientalis or Palaeocarcharodon sp.

Description

Like most prehistoric sharks, Palaeocarcharodon has an uncertain size, but it is estimated that it was comparable in size to mako sharks or the modern great white shark. Teeth of Palaeocarcharodon are triangular, labio-lingually compressed, with quite irregular serrations and serrate lateral cusplets. They can reach a size of about 3–6 centimetres (1.2–2.4 in).

Distribution Like most sharks, Palaeocarcharodon had a body made primarily of cartilage, not bone, currently being known by a few possible vertebrae and several teeth. Fossils of Palaeocarcharodon have been found in the Americas, Asia, Russia, North Africa, and Europe.

References

Illustrations

Worked examples

Example 1 — a first encounter with Palaeocarcharodon

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

In research: Palaeocarcharodon 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 Palaeocarcharodon 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: Palaeocarcharodon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1960, Fossils of the United States, Otodontidae, so understanding it makes those chapters shorter.
In everyday life: Look for Palaeocarcharodon 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 Palaeocarcharodon in 20 minutes

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

Frequently asked questions

What is Palaeocarcharodon in simple terms?

Why does Palaeocarcharodon 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 Palaeocarcharodon?

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 Palaeocarcharodon.