science

Priohybodus

Priohybodus 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 Priohybodus rather than just read about it. In short: Priohybodus is an extinct genus of hybodont shark that lived in Sahara Africa, the Arabian Peninsula and South America during the Late Jurassic and Early Cretaceous periods. This genus contains a singular species, P. arambourgi.

Key takeaways

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

Reference excerpt

Priohybodus is an extinct genus of hybodont shark that lived in Sahara Africa, the Arabian Peninsula and South America during the Late Jurassic and Early Cretaceous periods. This genus contains a singular species, P. arambourgi. It can grow up to 2 to 4 meters in length (based on tooth size) and preyed primarily on fish and large vertebrates grasping and cutting their prey. It has been taxonomically grouped with Secarodus and Planohybodus into an informally named group Priohybodontines. The genus was first described by Erasmo in 1960 based on fragmented and isolated tooth crowns discovered in a Late Jurassic formation in Somalia. The discovery of fossil material from the Early Cretaceous of southern Tunisia and the Late Jurassic Lugh series of Somalia greatly exspanded its geographic range. In Ethiopia, there are remains of a partially complete crown probably dated to the Tithonian age.

Distribution Like many members of Hybodontiformes, this genus had a wide palaeogeographic distribution across Gondwana being known from deposits in Saharan Africa and the Arabian Peninsula (Yemen). In Somalia it is known from the Late Jurassic period in the Conca di El Mao and Gerdes el Abid (Lugh series) formations. In Ethiopia, it is known from the Late Jurassic Mugher Mudstone. The Late Jurassic of northern Yemen and Uruguay have remains from the Amran and Tacuarembó formations respectively with 22 isolated teeth and a dorsal fin spine being discovered. Lastly for the Late Jurassic, it is known from the Aliança Formation in Brazil. In the Early Cretaceous of Tunsinia, remains have been found in the Douiret Formation.

Description It has fully serrated cutting edges on its teeth and was the first hybodontiform shark known to develop this. The teeth of this genus shows a high range of morphological plasticity.

References

Illustrations

Worked examples

Example 1 — a first encounter with Priohybodus

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

In research: Priohybodus 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 Priohybodus 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: Priohybodus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous cartilaginous fish, Cretaceous extinctions, Fossil taxa described in 1960, so understanding it makes those chapters shorter.
In everyday life: Look for Priohybodus 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 Priohybodus in 20 minutes

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

Frequently asked questions

What is Priohybodus in simple terms?

Why does Priohybodus 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 Priohybodus?

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 Priohybodus.