biology

Palaeopleurosaurus

Palaeopleurosaurus 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 Palaeopleurosaurus rather than just read about it. In short: Palaeopleurosaurus (meaning "old side lizard") is an extinct genus of diapsid reptiles belonging to the group Sphenodontia. Palaeopleurosaurus fossils were discovered in Germany (Holzmaden and Kerkhofen) from the Lower Toarcian (Early Jurassic), Posidonia Shale, dated to about 182-180 million years ago.

Key takeaways

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

Reference excerpt

Palaeopleurosaurus (meaning "old side lizard") is an extinct genus of diapsid reptiles belonging to the group Sphenodontia. Palaeopleurosaurus fossils were discovered in Germany (Holzmaden and Kerkhofen) from the Lower Toarcian (Early Jurassic), Posidonia Shale, dated to about 182-180 million years ago. The holotype come from the Middle Section, just under the Seagrasschiefer section (=Bifrons subzone) on both localities, probably linked with the coeval measured sea regression. Initially, Paleopleurosaurus was described to represent an intermediate morphology between Late Triassic-Lower Jurassic terrestrial sphenodontia and the late Jurassic fully aquatic Pleurosaurus. The study of a new specimen provided additional information, corroborating the existence of an early lineage of elongated sphenodontians, although with retained characters of terrestrial genera such as Kallimodon.

Paleobiology

Palaeopleurosaurus evidences that there was a slightly skeletal specialization for an aquatic lifestyle, achieved through the Jurassic gradually on pleurosaurs, a lifestyle supported by increased bone density in its gastralia. It has similarities with other marine reptiles, such with members of Sauropterygia the presence of a defined suture between the centrum and the neural arch, along with reducted sternum. However, the lack of increase in rib and femur bone density suggests that the lineage of Palaeopleurosaurus became gradually adapted to aquatic lifestyles, not as adapted as Pleurosaurus, as show limited morphological evidence of adaptation to a complete aquatic lifestyle, defined by no Osteosclerosis and the lack of Pachyostosis, except for a thicker shaft region in the humerus, that is as narrow as in terrestrial rhynchocephalians, such as the terrestrial Clevosaurus. Palaeopleurosaurus probably was still able to walk on land, for example for Oviposition. Recent studies suggest a shorter lifespan than modern Tuatara, based on irregular spacing of growth marks. Histology shows that the number of growth rings in Palaeopleurosaurus was smaller than the living tuatara, possibly indicating a shorter lifespan.

References

Illustrations

Worked examples

Example 1 — a first encounter with Palaeopleurosaurus

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

In research: Palaeopleurosaurus 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 Palaeopleurosaurus 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: Palaeopleurosaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1985, Fossils of Germany, Jurassic Germany, so understanding it makes those chapters shorter.
In everyday life: Look for Palaeopleurosaurus 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 Palaeopleurosaurus in 20 minutes

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

Frequently asked questions

What is Palaeopleurosaurus in simple terms?

Why does Palaeopleurosaurus 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 Palaeopleurosaurus?

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 Palaeopleurosaurus.