science

Pseudorca yokoyamai

Pseudorca yokoyamai 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 Pseudorca yokoyamai rather than just read about it. In short: Pseudorca yokoyamai is an extinct species of oceanic dolphin from the Calabrian stage of the Pleistocene of Japan, an extinct relative of the modern day false killer whale (P. crassidens). Discovery and taxonomy Pseudorca yokoyamai was described in 1926 by Matsumoto Hikoshichiro of the Tohoku Imperial University.

Key takeaways

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

Reference excerpt

Pseudorca yokoyamai is an extinct species of oceanic dolphin from the Calabrian stage of the Pleistocene of Japan, an extinct relative of the modern day false killer whale (P. crassidens).

Discovery and taxonomy Pseudorca yokoyamai was described in 1926 by Matsumoto Hikoshichiro of the Tohoku Imperial University. The holotype specimen is represented by two teeth–probably the very last two in the back of the mouth–and a paratype specimen consists of the right ramus of the mandible with seven teeth, though four teeth are incomplete. The holotype was found in Hommoku, Yokohama–the species name honoring the place of its discovery–and the paratype in the Kazusa Province on the opposite side of Tokyo Bay. It may represent an intermediary phase between the modern false killer whale and pilot whales (Globicephala spp.).

Description The teeth of P. yokoyamai are largely conical, though bend backward, with a smooth enamel coating. On the holotype, the second-to-last and last teeth measured respectively 47 and 50 mm (1.9 and 2.0 in) in height. P. yokowamai had smaller, though a greater number of, teeth than the modern false killer whale. The paratype represents the last seven teeth in the jaw, and there were perhaps three or four more teeth in front of it. The diameter of the tooth crown at the gumline is 14–15 mm (0.55–0.59 in), and the series of seven teeth is 177 mm (7.0 in) long.

References

Worked examples

Example 1 — a first encounter with Pseudorca yokoyamai

Start with the simplest possible case. Write down what Pseudorca yokoyamai 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 Pseudorca yokoyamai 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 Pseudorca yokoyamai 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 Pseudorca yokoyamai

In research: Pseudorca yokoyamai 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 Pseudorca yokoyamai 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: Pseudorca yokoyamai is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossils of Japan, Globicephalinae, Mammals described in 1926, so understanding it makes those chapters shorter.
In everyday life: Look for Pseudorca yokoyamai 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 Pseudorca yokoyamai in 20 minutes

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

Frequently asked questions

What is Pseudorca yokoyamai in simple terms?

Pseudorca yokoyamai is an extinct species of oceanic dolphin from the Calabrian stage of the Pleistocene of Japan, an extinct relative of the modern day false killer whale (P. crassidens). Discovery and taxonomy Pseudorca yokoyamai was described in 1926 by Matsumoto Hikoshichiro of the Tohoku Imper…

Why does Pseudorca yokoyamai 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 Pseudorca yokoyamai?

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 Pseudorca yokoyamai.