biology

Pucadelphys

Pucadelphys 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 Pucadelphys rather than just read about it. In short: Pucadelphys is an extinct genus of non-marsupial metatherian. The genus contains a single species, P. andinus.

Key takeaways

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

Reference excerpt

Pucadelphys is an extinct genus of non-marsupial metatherian. The genus contains a single species, P. andinus. Fossils of Pucadelphys have been found in the Santa Lucía Formation in Tiupampa in Bolivia.

Description Pucadelphys was small and likely to have eaten insects. It had a long tail, although incomplete on the best preserved fossils. It is possible that the tail was longer than (or at least as long as) its body. 17 vertebrae were preserved, and its estimated that there was 5 to 10 additional vertebrae originally. It is regarded as partially arboreal, and partially terrestrial. It may have been social, as more than 30 specimens have been found together.

Taxonomy A 2016 phylogenetic analysis recovered Pucadelphys as a member of a metatherian clade including sparassodonts and other South American taxa, but not marsupials (which are instead closer to Cretaceous North American species). The phylogenetic tree from the analysis is shown below.

References

Further reading Brands, S.J. (comp.) 1989–2005. Systema Naturae 2000. The Taxonomicon Archived 2011-01-25 at the Wayback Machine. Universal Taxonomic Services, Amsterdam, Holanda. McKenna, M.C., y Bell, S.K. (1997), Classification of Mammals Above the Species Level., Columbia University Press, New York. 0-231-11013-8. Suárez Soruco, R. (2007) Bolivia y su Paleodiversidad Cuadernos del Museo Geominero, nº 8. Instituto Geológico y Minero de España, Madrid. ISBN 978-84-7840-707-1

Illustrations

Worked examples

Example 1 — a first encounter with Pucadelphys

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

In research: Pucadelphys 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 Pucadelphys 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: Pucadelphys is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1988, Fossils of Bolivia, Monotypic prehistoric mammal genera, so understanding it makes those chapters shorter.
In everyday life: Look for Pucadelphys 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 Pucadelphys in 20 minutes

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

Frequently asked questions

What is Pucadelphys in simple terms?

Pucadelphys is an extinct genus of non-marsupial metatherian. The genus contains a single species, P. andinus.

Why does Pucadelphys 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 Pucadelphys?

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 Pucadelphys.