biology

Psalodon

Psalodon 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 Psalodon rather than just read about it. In short: Psalodon is an extinct genus of North American mammal that lived during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata.

Key takeaways

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

Reference excerpt

Psalodon is an extinct genus of North American mammal that lived during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata.

Biostratigraphy Present in stratigraphic zones 2 and 5.

Species Psalodon fortis was named by Othniel Charles Marsh in 1887 and G. G. Simpson in 1927. It is also known as Allodon fortis (Marsh 1887). Remains have been found in the Upper Jurassic Morrison Formation of Wyoming (United States). The holotype is at the Peabody Museum of Natural History at Yale University. Psalodon marshi was named by Simpson G.G. in 1929. All of the remains came from the Morrison Formation of Wyoming. Psalodon potens was named by Marsh O.C. in 1887 and Simpson G.G. in 1927. It is also known as Ctenacodon potens (Marsh 1887). The remains assigned to this species were also found in the Morrison Formation of Wyoming and the holotype is also at Yale.

References Simpson (1927), Mesozoic Mammalia. VII. "Taxonomy of Morrison multituberculates". Am. J. Sci. (5) xiv: 36–38. Marsh (1887), "American Jurassic mammals". Am. J. Sci. (3) xxxiii: p. 326-348. Kielan-Jaworowska Z & Hurum JH (2001), "Phylogeny and Systematics of multituberculate mammals". Paleontology 44, p. 389-429.

Worked examples

Example 1 — a first encounter with Psalodon

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

In research: Psalodon 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 Psalodon 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: Psalodon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1926, Mesozoic mammal stubs, Morrison mammals, so understanding it makes those chapters shorter.
In everyday life: Look for Psalodon 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 Psalodon in 20 minutes

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

Frequently asked questions

What is Psalodon in simple terms?

Psalodon is an extinct genus of North American mammal that lived during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata.

Why does Psalodon 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 Psalodon?

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 Psalodon.