science

Orcinus paleorca

Orcinus paleorca 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 Orcinus paleorca rather than just read about it. In short: Orcinus paleorca is an extinct species of Orcinus, the genus of killer whales (orca), dated to the Early Pleistocene (Calabrian age). Taxonomy The holotype specimen, a tooth fragment, was found by G.

Key takeaways

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

Reference excerpt

Orcinus paleorca is an extinct species of Orcinus, the genus of killer whales (orca), dated to the Early Pleistocene (Calabrian age).

Taxonomy The holotype specimen, a tooth fragment, was found by G. Natsume in the Sanuki Formation in the Kazusa Province of Honshu, Japan, dated to the Calabrian age. It was described in 1937 by Japanese paleontologist Hikoshichiro Matsumoto. Orcinus paleorca could represent the ancestor of the modern killer whale (Orcinus orca). Matsumoto noted that the teeth of O. paleorca are much larger and have more similar dimensions to the modern killer whale than those of the Pliocene O. citoniensis.

Description The tooth is conical and belonged to the upper right or lower left jaw of an adult individual. The tooth fragment is 5 cm (2.0 in) in height–though the actual height may have been double that–2.25 cm (0.89 in) longitudinally–from the side facing the tongue to the side facing the lip–and 2.95 cm (1.16 in) transversely–from the left side of the tooth to the right. In comparison, the modern killer whale has teeth around 8 cm (3.1 in) in height and 2.5 cm (0.98 in) in diameter. Like the modern killer whale, the tooth lacks a coat of cementum. However, unlike the modern killer whale, O. paleorca had a circular tooth root as opposed to an oval, and the pulp extended more towards the back than the front.

Paleobiology Orcinus species, like many other predatory marine lineages, may have fished up the food chain, with the apparently more primitive O. citoniensis able to hunt large fish, and the modern killer whale's ability to hunt large whales. The Middle Pleistocene deposits indicate a warm temperate climate, and temperate forests of land. The marine mammal diversity comprises O. paleorca, an undetermined species of Orcinus, the baleen whale Mizuhoptera, an unidentified oceanic dolphin, the fossil false killer whale Pseudorca yokoyamai, the fossil walrus Odobenus mandanoensis, an undetermined species of Eumetopias sea lion, and the recently extinct Steller's sea cow (Hydrodamalis gigas). Sharks present were the great white shark (Carcharodon carcharias) and the extinct broad-toothed mako (Cosmopolitodus hastalis).

References

Illustrations

Worked examples

Example 1 — a first encounter with Orcinus paleorca

Start with the simplest possible case. Write down what Orcinus paleorca 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 Orcinus paleorca 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 Orcinus paleorca 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 Orcinus paleorca

In research: Orcinus paleorca 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 Orcinus paleorca 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: Orcinus paleorca is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1937, Fossils of Japan, Orcinus, so understanding it makes those chapters shorter.
In everyday life: Look for Orcinus paleorca 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 Orcinus paleorca in 20 minutes

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

Frequently asked questions

What is Orcinus paleorca in simple terms?

Orcinus paleorca is an extinct species of Orcinus, the genus of killer whales (orca), dated to the Early Pleistocene (Calabrian age). Taxonomy The holotype specimen, a tooth fragment, was found by G.

Why does Orcinus paleorca 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 Orcinus paleorca?

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 Orcinus paleorca.