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Ichthyosauriformes

Ichthyosauriformes 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 Ichthyosauriformes rather than just read about it. In short: The Ichthyosauriformes are a group of marine reptiles, belonging to the Ichthyosauromorpha, that lived during the Mesozoic. Members of this group may be informally termed ichthyosaurs, though this term is also used for the smaller group Ichthyopterygia.

Ichthyosauriformes — main illustration
Ichthyosauriformes — illustration

Key takeaways

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

Reference excerpt

The Ichthyosauriformes are a group of marine reptiles, belonging to the Ichthyosauromorpha, that lived during the Mesozoic. Members of this group may be informally termed ichthyosaurs, though this term is also used for the smaller group Ichthyopterygia. The stem clade Ichthyosauriformes was in 2014 defined by Ryosuke Motani and colleagues as the group consisting of all ichthyosauromorphs that are more closely related to Ichthyosaurus communis than to Hupehsuchus nanchangensis. Their synapomorphies include the possession of a long nasal bone, stretching to the front beyond the nostril; large scleral rings, filling the eye sockets; a narrow snout in top view; and converging digits with little space between them. The Ichthyosauriformes probably split off in the Early Triassic, about 250 million years ago; the last known forms lived in the middle Cretaceous. A basal ichthyosauriform is Cartorhynchus; more derived species are part of the Ichthyopterygia which again include the Ichthyosauria.

References

Literature Motani, R., Jiang, D.-Y., Chen, G.-B., Tintori, A., Rieppel, O., Ji, C., and Huang J.-D., 2014, "A basal ichthyosauriform with a short snout from the Lower Triassic of China", Nature. doi:10.1038/nature13866

Illustrations

Ichthyosauriformes illustration

Worked examples

Example 1 — a first encounter with Ichthyosauriformes

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

In research
Ichthyosauriformes 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 Ichthyosauriformes 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
Ichthyosauriformes is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 2014, Ichthyosauromorpha, Mesozoic reptiles, so understanding it makes those chapters shorter.
In everyday life
Look for Ichthyosauriformes 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 Ichthyosauriformes in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Ichthyosauriformes means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Ichthyosauriformes out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ichthyosauriformes in simple terms?

The Ichthyosauriformes are a group of marine reptiles, belonging to the Ichthyosauromorpha, that lived during the Mesozoic. Members of this group may be informally termed ichthyosaurs, though this term is also used for the smaller group Ichthyopterygia.

Why does Ichthyosauriformes 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 Ichthyosauriformes?

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 Ichthyosauriformes.

Tags

  • Fossil taxa described in 2014
  • Ichthyosauromorpha
  • Mesozoic reptiles
  • Olenekian first appearances
  • Turonian extinctions

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