science

Sinoconodon

Sinoconodon 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 Sinoconodon rather than just read about it. In short: Sinoconodon is an extinct genus of mammaliamorphs that appears in the fossil record of the Lufeng Formation of China in the Sinemurian stage of the Early Jurassic period, about 193 million years ago. While sharing many plesiomorphic traits with other non-mammaliaform cynodonts, it possessed a special, secondarily evolved jaw joint between the dentary and the squamosal bones, which in more derived taxa would replace…

Key takeaways

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

Reference excerpt

Sinoconodon is an extinct genus of mammaliamorphs that appears in the fossil record of the Lufeng Formation of China in the Sinemurian stage of the Early Jurassic period, about 193 million years ago. While sharing many plesiomorphic traits with other non-mammaliaform cynodonts, it possessed a special, secondarily evolved jaw joint between the dentary and the squamosal bones, which in more derived taxa would replace the primitive tetrapod one between the articular and quadrate bones. The presence of a dentary-squamosal joint is a trait historically used to define mammals.

Description

This animal had a skull of 6 cm (2.4 in), which suggests a presacral body length of 25 cm (9.8 in) and a weight of about 800 g (28 oz) due to the similar parameters to the European hedgehog. Sinoconodon closely resembled early mammaliaforms like Morganucodon, but it is regarded as more basal, differing substantially from Morganucodon in its dentition and growth habits. Like most other non-mammalian tetrapods, such as reptiles and amphibians, it was polyphyodont, replacing many of its teeth throughout its lifetime, and it seems to have grown slowly but continuously until its death. It was thus somewhat less mammal-like than mammaliaforms such as morganucodonts and docodonts. The combination of basal tetrapod and mammalian features makes it a unique transitional fossil.

Taxonomy Sinoconodon was named by Patterson and Olson in 1961. Its type is Sinoconodon rigneyi. It was assigned to Triconodontidae by Patterson and Olson in 1961; to Triconodonta by Jenkins and Crompton in 1979; to Sinoconodontidae by Carroll in 1988; to Mammaliamorpha by Wible in 1991; to Mammalia by Luo and Wu in 1994; to Mammalia by Kielan-Jaworowska et al. in 2004; and to Mammaliaformes by Luo et al. in 2001 and Bi et al. in 2014.

Phylogeny

References

External links Mammaliformes from Palaeos [1] http://eol.org/pages/10575421/names?all=1 http://palaeos.com/vertebrates/mammaliformes/mammaliformes.html#Mammaliformes

Illustrations

Worked examples

Example 1 — a first encounter with Sinoconodon

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

In research: Sinoconodon 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 Sinoconodon 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: Sinoconodon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Early Jurassic synapsids of Asia, Fossil taxa described in 1961, Fossils of China, so understanding it makes those chapters shorter.
In everyday life: Look for Sinoconodon 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 Sinoconodon in 20 minutes

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

Frequently asked questions

What is Sinoconodon in simple terms?

Why does Sinoconodon 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 Sinoconodon?

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 Sinoconodon.