science

Opluridae

Opluridae 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 Opluridae rather than just read about it. In short: The Opluridae, or Madagascan iguanas, are a family of moderately-sized lizards native to Madagascar and Grande Comore. There are eight species across two genera, with most of them being under Oplurus.

Key takeaways

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

Reference excerpt

The Opluridae, or Madagascan iguanas, are a family of moderately-sized lizards native to Madagascar and Grande Comore. There are eight species across two genera, with most of them being under Oplurus. The other genus, Chalarodon, is easily distinguishable from Oplurus as it contains species with a dorsal crest, particularly distinct in males, and has a smoother tail covered in similarly sized scales. Genus Oplurus has large segmented spiny scales, and no dorsal crest along the spine. The Opluridae, along with the banded iguanas and their kin (family Iguanidae) of Fiji, are the only extant members of the Pleurodonta that are found outside of the Americas. The Opluridae family includes terrestrial species that live amongst rocks and canyons, along with some that are arboreal, and two that prefer sandier habitats. All of the species are oviparous, or egg-layers, and have teeth that resemble those of the true iguanas. A study to identify the primary foraging methods of the Oplurus genus indicated that ambush hunting was preferred due to the reptiles' low movement-per-minute (MPM) and percent-time-spent-moving (PTM) rates, especially during the very rainy and very dry seasons of the Ampijoroa Forest and Ankarafantsika. Previously, due to their physical isolation from all other iguanids, it was thought that oplurids had very ancient/basal origins; a study of mitochondrial DNA sequences had put the split between Opluridae and Iguanidae—within which Opluridae is occasionally classified as subfamily Oplurinae—at about 165 million years ago (MYA), during the Middle Jurassic. This study supported the monophyly of the expanded Iguanidae, thus placing Oplurinae in the basal position—consistent with a vicariant origin of the Madagascan iguanians, as Madagascar is believed to have separated from Africa some 140 MYA during the breakup of Gondwana. However, a 2022 study found Opluridae to be the sister group to the Leiosauridae, a family of iguanids found only in South America. Both groups were found to have only diverged during the Paleocene, about 60 MYA. As this divergence was too recent to be a result of vicariance, it was proposed that the Opluridae colonized Madagascar via oceanic dispersal, floating on uprooted trees, shrubbery and other amalgamated natural objects directly to Madagascar from South America. Alternate theories see the reptiles reaching mainland Africa first, before later making their way to Madagascar, or floating from South America to Madagascar with Antarctica as a stopping-point (as the continent was not yet glaciated at the time).

Species

References

External links Family Opluridae

Illustrations

Worked examples

Example 1 — a first encounter with Opluridae

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

In research: Opluridae 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 Opluridae 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: Opluridae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Callovian first appearances, Extant Middle Jurassic first appearances, Lizard families, so understanding it makes those chapters shorter.
In everyday life: Look for Opluridae 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 Opluridae in 20 minutes

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

Frequently asked questions

What is Opluridae in simple terms?

Why does Opluridae 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 Opluridae?

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 Opluridae.