biology

Subcollina

Subcollina 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 Subcollina rather than just read about it. In short: Subcollina is a genus of evolute to serpenticonic stephanoceratoidean ammonites from the Middle Jurassic (Baj) of Mexico, placed in the family Spiroceratidae. The whorl section of Subcollina is subquadrate, slightly depressed in the inner whorls, slightly compressed at the mature aperture.

Key takeaways

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

Reference excerpt

Subcollina is a genus of evolute to serpenticonic stephanoceratoidean ammonites from the Middle Jurassic (Baj) of Mexico, placed in the family Spiroceratidae. The whorl section of Subcollina is subquadrate, slightly depressed in the inner whorls, slightly compressed at the mature aperture. The inner whorls are covered with fine, dense, primary ribs that become widespread and thicker on the outer whorls, terminating in ventrolateral tubercles from which two or sometimes three secondary ribs extend that cross the venter in a regular zig-zag pattern.

Subcollina is probably derived from the Stephanoceratidae. Some stephanoceratids also have the zig-zag pattern of Subcollina. Related genera include Parastrenoceras, Strenoceras, and Spiroceras. Note that the described zig-zag pattern in the secondary ribs as they cross the venter may be hard to make out in fig 32 of Sandoval and Westermann (1986)

References

Worked examples

Example 1 — a first encounter with Subcollina

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

In research: Subcollina 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 Subcollina 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: Subcollina is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ammonitida genera, Ammonitida stubs, Fossils of Mexico, so understanding it makes those chapters shorter.
In everyday life: Look for Subcollina 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 Subcollina in 20 minutes

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

Frequently asked questions

What is Subcollina in simple terms?

Why does Subcollina 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 Subcollina?

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 Subcollina.