biology

Megachirella

Megachirella 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 Megachirella rather than just read about it. In short: Megachirella is an extinct genus of lepidosauromorph that lived about 240 million years ago during the Middle Triassic and contains only one known species, Megachirella wachtleri. It is known from a partial skeleton discovered in the Dolomites of Northern Italy and was described in 2003.

Key takeaways

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

Reference excerpt

Megachirella is an extinct genus of lepidosauromorph that lived about 240 million years ago during the Middle Triassic and contains only one known species, Megachirella wachtleri. It is known from a partial skeleton discovered in the Dolomites of Northern Italy and was described in 2003.

Description Megachirella is known exclusively from a partial skeleton, preserved in anatomical connection. The find includes an almost complete skull, the front half of the body and part of the front legs. The skull, although devoid of the front part of the snout, is rather robust and large; the neck is moderately elongated and the front legs are large and strong. The dimensions do not exceed 15 cm (5.9 in) in length, and the appearance is similar to that of a strong-legged lizard.

Classification

Megachirella was discovered in the Dont Formation of the area of Braies, in South Tyrol, and described in 2003. It was classified as a member of Lepidosauromorpha, the clade of reptiles that includes lizards, snakes, the tuatara and their closest extinct relatives, at the time. In particular, the fossils show some similarities, mainly in the skull, with some primitive forms such as the Eolacertilia. A phylogenetics analysis in 2013 confirmed that it was a lepidosauromorph closely related to the crown group Lepidosauria. A study in 2018, led by Tiago R. Simōes from the University of Alberta, found that Megachirella was a stem-squamate, making it the oldest known member of the order Squamata, the order that includes lizards, snakes and amphisbaenians (worm lizards). The study was conducted by performing high-resolution microfocus X-ray computed tomography (micro-CT) scans on the fossil specimen of Megachirella to gather detailed data about its anatomy. This data was then compared with a phylogenetic dataset combining the morphological and molecular data of 129 extant (living) and extinct reptilian taxa. The comparison revealed Megachirella had certain features that are unique to squamates. The study also found that geckoes are the earliest crown group squamates, not iguanians. However, a 2021 study found the genus to be a lepidosaur of uncertain position, in a polytomy with Squamata and Rhynchocephalia. In 2025, Marke and colleagues recovered Megachirella as a basal lepidosauromorph within a clade that includes Fraxinisaura and Marmoretta.

Paleobiology Despite being found in marine deposits, the fossil of Megachirella shows no adaptation to aquatic life. On the contrary, characteristics like the strong front legs, the shape of the claws, the well-ossified carpus and the hollow ribs lead one to think that this animal was well adapted to a terrestrial lifestyle. The specimen was probably transported to a shallow coastal environment due to heavy storms after it died.

References

Illustrations

Worked examples

Example 1 — a first encounter with Megachirella

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

In research: Megachirella 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 Megachirella 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: Megachirella is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossils of Italy, Lepidosauromorpha, Middle Triassic reptiles of Europe, so understanding it makes those chapters shorter.
In everyday life: Look for Megachirella 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Megachirella” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Megachirella in 20 minutes

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

Frequently asked questions

What is Megachirella in simple terms?

Why does Megachirella 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 Megachirella?

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 Megachirella.