science

Retinosaurus

Retinosaurus 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 Retinosaurus rather than just read about it. In short: Retinosaurus (meaning "amber lizard") is an extinct genus of scincomorph lizard from the Early Cretaceous of Myanmar. The genus contains a single species, Retinosaurus hkamtiensis, known from a specimen preserved in amber.

Key takeaways

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

Reference excerpt

Retinosaurus (meaning "amber lizard") is an extinct genus of scincomorph lizard from the Early Cretaceous of Myanmar. The genus contains a single species, Retinosaurus hkamtiensis, known from a specimen preserved in amber.

Discovery and naming The holotype specimen, GRS 29689, was legally obtained from a Myanmar gem dealer in 2019. It was subsequently announced in a preprint by Čerňanský et al. in October 2021, and validly described as a new genus and species of lizard upon publication in January 2022. The fossil was discovered in the Hkamti amber site of Myanmar, which dates to the early Albian, approximately 110 million years ago. The holotype, which represents a juvenile individual, includes a well-preserved articulated skull, partial postcrania, and skin impressions. In addition to the lizard fossil material, the amber also contains several coleopterans. The generic name, "Retinosaurus", is derived from the Greek words "retine", referring to liquid resins created by trees, and "saurus", meaning "lizard". The specific name, "hkamtiensis", references Hkamti, the type locality.

Classification In all but one of the phylogenetic analyses performed by Čerňanský et al. (2022), Retinosaurus was recovered as a Pan-xantusiid. Most phylogenies resulted with Retinosaurus as a sister taxon to a clade formed by Tepexisaurus + Xantusiidae. Because the holotype represents an immature individual, the authors explain that any phylogenetic results should be treated with caution. Their results are displayed in the cladogram below:

References

Illustrations

Worked examples

Example 1 — a first encounter with Retinosaurus

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

In research: Retinosaurus 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 Retinosaurus 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: Retinosaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous lizards, Early Cretaceous reptiles of Asia, Fossil taxa described in 2022, so understanding it makes those chapters shorter.
In everyday life: Look for Retinosaurus 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 Retinosaurus in 20 minutes

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

Frequently asked questions

What is Retinosaurus in simple terms?

Why does Retinosaurus 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 Retinosaurus?

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 Retinosaurus.