biology

Macropterygius

Macropterygius 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 Macropterygius rather than just read about it. In short: Macropterygius is a genus of ichthyosaurs known from the Late Jurassic (Kimmeridgian age) of England (Kimmeridge Clay formation). Though many specimens have been referred to this genus from all over Europe, the type specimen of the only recognized species, M. trigonus, consists of just a single vertebra.

Key takeaways

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

Reference excerpt

Macropterygius is a genus of ichthyosaurs known from the Late Jurassic (Kimmeridgian age) of England (Kimmeridge Clay formation). Though many specimens have been referred to this genus from all over Europe, the type specimen of the only recognized species, M. trigonus, consists of just a single vertebra. Because this cannot be used to distinguish ichthyosaurs from one another, the genus and species are currently considered nomina dubia (doubtful names).

Discovery and species Originally described by Owen (1840) as a species of the genus Ichthyosaurus (I. trigonus). It has had an unstable taxonomic history, partly because the species was originally named without designating any particular specimen as the holotype. In 1889, the original type specimen of I. trigonus used by richard Owen was thought to be lost, and so Lydekker named several isolated vertebrae as the "type" of this species, though during this time there was no formal concept of a neotype. This created a problem, because the vertebrae selected by Lydekker came from unknown sediments and were not definitely associated with the original specimens named and described by Owen. Matters were complicated when the original holotype used by Owen was re-discovered, making the designation of a neotype unnecessary. This situation was not officially fixed until 1993, when the International Commission on Zoological Nomenclature formally declared that Lydekker's statement about the "type" did not count as designating a neotype, and so the designation did not need to be reversed in light of the holotype's re-discovery. The ICZN, in the same decision (Opinion 1734, Case 2779), added the genus Macropterygius and species M. trigonus (originally I. trigonus) to the list of generic and specific names, making both names nomina conservanda. The original holotype specimen is currently held by the Academy of Natural Sciences in Philadelphia, cataloged as specimen number ANSP 10124. In 2000, Bardet and Fernández found that the holotype specimen of Macropterygius trigonus is undiagnosible beyond the level of Ophthalmosauridae, thus this genus and species were considered nomina dubia.

Worked examples

Example 1 — a first encounter with Macropterygius

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

In research: Macropterygius 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 Macropterygius 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: Macropterygius is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1840, Ichthyosauria stubs, Ichthyosauromorph genera, so understanding it makes those chapters shorter.
In everyday life: Look for Macropterygius 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 Macropterygius in 20 minutes

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

Frequently asked questions

What is Macropterygius in simple terms?

Why does Macropterygius 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 Macropterygius?

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 Macropterygius.