science

Plutonides

Plutonides 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 Plutonides rather than just read about it. In short: Plutonides is a genus of Middle Cambrian trilobite in the family Paradoxididae with species Plutonides sedgwickii and possibly Plutonides? illingi. Several other species and subspecies were at times placed in Plutonides but have subsequently been moved to other genera.

Key takeaways

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

Reference excerpt

Plutonides is a genus of Middle Cambrian trilobite in the family Paradoxididae with species Plutonides sedgwickii and possibly Plutonides? illingi. Several other species and subspecies were at times placed in Plutonides but have subsequently been moved to other genera. In terms of the Scandinavian Middle Cambrian sequence the genus ranges from the Baltoparadoxides oelandicus Biosuperzone (B. pinus Biosubzone) at the type locality for P. sedwickii on Trwyncynddeiriog headland located 1.3 km (0.81 mi) south-southwest of St David’s Cathedral and 500 m (1,600 ft) east of Porth Clais Harbour - Pen-y-Cyfrwy Member, Newgale Formation, and possibly to middle part of the Mawddachites hicksii Biozone on the Penpleidiau (eastern) Headland of Caerfai Bay south of St David’s in southwest Wales, where P? illingi occurs [Locs. TC-1 & CF-1 of Rees et al.]

Type Plutonia sedgwickii is the type species for the genus and was first described in 1871 as "Plutonia" sedgwickii. However the genus name "Plutonia" had already been used for the Vitrinidae snail genus Plutonia by Morelet in Stabile (1864), and so the new genus Plutonides was coined by Hicks (1895). The species Lectotype is SM A1086, an internal mould of cranidium,.

Species Paradoxides cf. sedgwickii, described by Smith and White (1963) from the Baltoparadoxides pinus Biosubzone in the upper part of the Purley Shale Formation of Warwickshire, central England was redescribed by Rushton (1966, p. 42, pl. 6, figs. 1-10) as ‘Paradoxides’ sedgwickii porphyrus. The subspecies has broader palpebral lobes and finer surface granulation than observed in P. sedgwickii sedgwickii. Vanĕk et al. (1999) described cranidia from the Middle Cambrian of Skrije - Týřovice area in the Czech Republic as Plutonides hicksi, although the specimens illustrated are of a different species to that from Wales. Fletcher (2007) however, has also since established the new subgenus, Paradoxides (Mawddachites), to include P. hicksii as type species. Alvarez et al. (2010) raised Mawddachites to a full genus.

References

Illustrations

Worked examples

Example 1 — a first encounter with Plutonides

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

In research: Plutonides 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 Plutonides 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: Plutonides is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cambrian genus extinctions, Cambrian trilobites of Asia, Cambrian trilobites of Europe, so understanding it makes those chapters shorter.
In everyday life: Look for Plutonides 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 Plutonides in 20 minutes

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

Frequently asked questions

What is Plutonides in simple terms?

Why does Plutonides 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 Plutonides?

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 Plutonides.