biology

Holcodiscus

Holcodiscus 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 Holcodiscus rather than just read about it. In short: Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores.

Key takeaways

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

Reference excerpt

Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores. The type species of the genus is Ammonites caillaudianus.

Description Circular to rectangular whorl section; fine, low, straight or flexuous simple or branched ribs, periodically truncated by thin, high, enlarged ribs bearing lateral and ventrolateral tubercles; inner whorls tending to have depressed whorl section and to resemble Olcostephanus.

Species Source:

Holcodiscus caillaudianus d'Orbigny 1850 Holcodiscus camelinus d'Orbigny 1850 Holcodiscus hauthali Paulcke 1907 Holcodiscus tenuistriatus Paulcke 1907

Distribution Fossils of species within this genus have been found in the Cretaceous sediments of Austria, Bulgaria, Chile, Colombia, Czech Republic, Slovakia, France, Italy, Morocco, Spain and Russia.

Gallery

Notes

External links

"Holcodiscus". mindat.org. Retrieved 30 December 2021. "Holcodiscus". Encyclopedia of Life (EOL). Retrieved 30 December 2021. Wright, Claud William; with John Hannes Callomon and M.K. Howarth (1996). Roger L. Kaesler (ed.). Mollusca 4 Revised, Cretaceous Ammonoidea in Treatise on Invertebrate Paleontology Part L. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 48.{{cite book}}: CS1 maint: multiple names: authors list (link) Arkell, W. J.; Furnish, W. M.; Kummel, Bernhard; Miller, A.K.; Moore, R.C.; Schindewolf, O.H. (1957). "Part L, Mollusca 4: Cephalopoda, Ammonoidea". In Raymond C. Moore (ed.). Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press. p. L371. ISBN 978-0-8137-3012-7 – via Internet Archive. {{cite book}}: ISBN / Date incompatibility (help)

Illustrations

Worked examples

Example 1 — a first encounter with Holcodiscus

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

In research: Holcodiscus 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 Holcodiscus 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: Holcodiscus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ammonites of Europe, Ammonites of North America, Ammonites of South America, so understanding it makes those chapters shorter.
In everyday life: Look for Holcodiscus 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 Holcodiscus in 20 minutes

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

Frequently asked questions

What is Holcodiscus in simple terms?

Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores.

Why does Holcodiscus 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 Holcodiscus?

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 Holcodiscus.