biology

Holopterygius

Holopterygius 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 Holopterygius rather than just read about it. In short: Holopterygius is an extinct genus of prehistoric eel-like coelacanth known from the Devonian of Europe. It contains a single species, H. nudus, known from the Middle Devonian (Givetian)-aged Oberer Plattenkalk of Germany.

Key takeaways

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

Reference excerpt

Holopterygius is an extinct genus of prehistoric eel-like coelacanth known from the Devonian of Europe. It contains a single species, H. nudus, known from the Middle Devonian (Givetian)-aged Oberer Plattenkalk of Germany. Despite its specialized morphology and superficial dissimilarity to the usual Paleozoic coelacanth body plan, it is one of the most basal actinistian fish. It was initially described as an osteichthyan of uncertain affinities until it was recognized as a coelacanth in 2006, over 30 years after its initial description. It appears to be most closely related to Allenypterus, another unusual eel-like early coelacanth, which lived much later during the Carboniferous. The taxonomic position of the clade containing both has varied due to their morphology, but a 2026 study found them to belong to a monophyletic clade of Paleozoic coelacanths, which the family Diplocercididae was redefined to encompass.

Illustrations

Worked examples

Example 1 — a first encounter with Holopterygius

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

In research: Holopterygius 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 Holopterygius 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: Holopterygius is common in secondary-school and first-year university syllabi. It links to neighbouring topics Devonian sarcopterygians of Europe, Fossil taxa described in 1973, Fossils of Germany, so understanding it makes those chapters shorter.
In everyday life: Look for Holopterygius 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 Holopterygius in 20 minutes

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

Frequently asked questions

What is Holopterygius in simple terms?

Why does Holopterygius 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 Holopterygius?

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 Holopterygius.