biology

Palaeoxonodon

Palaeoxonodon 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 Palaeoxonodon rather than just read about it. In short: Palaeoxonodon is an extinct genus of cladotherian mammal from the Middle Jurassic of England and Scotland. Discovery The first fossils of Palaeoxonodon ooliticus were found in the "Mammal Bed" in Kirtlington Quarry, Oxfordshire, England.

Key takeaways

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

Reference excerpt

Palaeoxonodon is an extinct genus of cladotherian mammal from the Middle Jurassic of England and Scotland.

Discovery The first fossils of Palaeoxonodon ooliticus were found in the "Mammal Bed" in Kirtlington Quarry, Oxfordshire, England. This site was rich in Mesozoic mammal remains from the Bathonian Forest Marble Formation. Later, two more species of Palaeoxonodon were named from the same site, P. leesi and P. freemani. All of these fossils were individual teeth. However, a recent fossil recovered from the Kilmaluag Formation of Skye, Scotland comprised a lower jaw with five molar teeth, four premolars, a canine and one incisor present. This more complete fossil suggests that the separate species previously named from England were in fact all the same species, P. ooliticus, and only appeared different due to their differing position along the tooth row. This was also the case for Kennetheridium leesi. Two dentaries have recently been described.

Description Palaeoxonodon ooliticus, like most mammals in the Mesozoic, was relatively small. The most complete fossil jaw - from Scotland - measures 11.6mm, but does not include the very front or rear portions of the jaw. The living animal was probably around the size of a mouse and would have been insectivorous. The teeth of Palaeoxondon have an elongate lower molar talonid, with hypoconid placed buccal to the midline of the crown, well-developed upper molar metacone and wing-like parastylar region. Compared to its closest relatives, Palaeoxonodon has rather slender jaws.

Taxonomy Palaeoxondon belongs in the order Amphitheriida, closely related to Dryolestida. They are among the earliest cladotherian mammals, which have their origins in the Middle Jurassic and consist of the descendants of the last common ancestor of Amphitheriida, Dryolestida, Peramurida and Zatheria (which includes modern Therian mammals). Recent phylogenetic studies indicate that Palaeoxonodon was a sister taxon of Amphitherium itself. Cladogram after Panciroli et al. 2018:

However, some studies have not found a close relationship with Amphitherium. Cladogram after Lasseron et al. 2022:

References

Illustrations

Worked examples

Example 1 — a first encounter with Palaeoxonodon

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

In research: Palaeoxonodon 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 Palaeoxonodon 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: Palaeoxonodon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bathonian genera, Cladotheria, Fossil taxa described in 1976, so understanding it makes those chapters shorter.
In everyday life: Look for Palaeoxonodon 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 “Palaeoxonodon” →

Affiliate

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

How to study Palaeoxonodon in 20 minutes

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

Frequently asked questions

What is Palaeoxonodon in simple terms?

Palaeoxonodon is an extinct genus of cladotherian mammal from the Middle Jurassic of England and Scotland. Discovery The first fossils of Palaeoxonodon ooliticus were found in the "Mammal Bed" in Kirtlington Quarry, Oxfordshire, England.

Why does Palaeoxonodon 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 Palaeoxonodon?

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 Palaeoxonodon.