biology

Ieldraan

Ieldraan 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 Ieldraan rather than just read about it. In short: Ieldraan is an extinct genus of metriorhynchid thalattosuchian from the Jurassic (Callovian) period Oxford Clay Formation of England. The sole species known is Ieldraan melkshamensis.

Key takeaways

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

Reference excerpt

Ieldraan is an extinct genus of metriorhynchid thalattosuchian from the Jurassic (Callovian) period Oxford Clay Formation of England. The sole species known is Ieldraan melkshamensis. Researchers have derived a body length estimate of 2.95 to 3.22 m (9.7 to 10.6 ft) based on a 55–60 cm (1 ft 10 in – 2 ft 0 in) long basicranium that was discovered during the 1870s.

History The type specimen NHMUK PV OR 46797, consisting of a fragmentary and damaged skull, was first discovered in 1870's from the Oxford Clay Formation. Before being described, the specimen was informally known as the 'Melksham monster', as it was discovered near the English town of Melksham. The sole genus and species, Ieldraan melkshamensis, was formally described in 2017 by Davide Foffa and colleagues. The genus name derives from Old English words Ieldra and an, meaning "older one" in reference to its older age compared to its relatives, while the species name references the town Melksham.

Evolution & Classification Ieldraan is a member of the derived group of large macropredatory metriorhynchids called Geosaurini. Within that, it is forms a clade with the genus Geosaurus, called Geosaurina. The description of Ieldraan showed that members of Geosaurini evolved and diversified up to 10 million years earlier than previously thought. Additionally, adaptations for feeding on large prey were present in geosaurins earlier than realized, now at least by the Callovian stage of the Middle Jurassic. These show that this group didn't diversify as suddenly as previously thought, showing an earlier and more gradual radiation in species and traits. The cladogram below is from a 2023 analysis by Léa Girard and colleagues in their description of Torvoneustes jurensis.

References

Worked examples

Example 1 — a first encounter with Ieldraan

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

In research: Ieldraan 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 Ieldraan 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: Ieldraan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 2017, Jurassic stubs, Late Jurassic crocodylomorphs of Europe, so understanding it makes those chapters shorter.
In everyday life: Look for Ieldraan 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 Ieldraan in 20 minutes

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

Frequently asked questions

What is Ieldraan in simple terms?

Ieldraan is an extinct genus of metriorhynchid thalattosuchian from the Jurassic (Callovian) period Oxford Clay Formation of England. The sole species known is Ieldraan melkshamensis.

Why does Ieldraan 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 Ieldraan?

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 Ieldraan.