biology

Haliotis discus

Haliotis discus 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 Haliotis discus rather than just read about it. In short: Haliotis discus is a species of abalone native to Japan and Korea. Taxonomy and subspecies Haliotis discus was described by Lovell Augustus Reeve in 1846.

Key takeaways

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

Reference excerpt

Haliotis discus is a species of abalone native to Japan and Korea.

Taxonomy and subspecies Haliotis discus was described by Lovell Augustus Reeve in 1846. Two subspecies are known:

Haliotis discus discus Reeve, 1846 – Japan (Honshu, Kyushu, Shikoku) and Korea (Jeju Island) Haliotis discus hannai Ino, 1953 – Japan (Hokkaido, Honshu, Kyushu, Shikoku) and Korea

Distribution and habitat Haliotis discus is native to the shallow subtidal waters off Japan and Korea in the north western Pacific Ocean. H. discus discus typically hides between rocks found at depths of 5–10 m (16–33 ft), sometimes as deep as 30 m (98 ft), in the waters around Jeju Island in Korea and Kyushu, Shikoku, and all but the most north eastern areas of Honshu in Japan. H. discus hannai is typically found in exposed habitats at depths of 1–5 m (3 ft 3 in – 16 ft 5 in) in waters the around Korea and the north eastern coast of Honshu and western coast of Hokkaido in Japan.

Description

The size of the shell varies between 100 mm and 150 mm. "This species is closely allied in all characters to Haliotis kamtschatkana but is more elongated than the typical Kamtschatkana. The interior surface has a peculiarly metallic luster, light bronze-green and coppery-red predominating."

Ecology Haliotis discus larvae settle on crust-forming coralline algae and feed on diatoms as they develop, moving out into kelp beds as they near maturity. Primary predators of this species include crabs, starfishes, and octopuses. In H. discus discus, spawning occurs from October to December. Adults feed on seaweeds such as Eisenia bicyclis, Undaria pinnatifida, and Ecklonia species.

References

Geiger D.L. & Owen B. (2012) Abalone: Worldwide Haliotidae. Hackenheim: Conchbooks. viii + 361 pp.

External links

"Haliotis (Haliotis) discus discus". Gastropods.com. Retrieved 16 January 2019.

Illustrations

Worked examples

Example 1 — a first encounter with Haliotis discus

Start with the simplest possible case. Write down what Haliotis discus 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 Haliotis discus 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 Haliotis discus 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 Haliotis discus

In research: Haliotis discus 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 Haliotis discus 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: Haliotis discus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abalone, Commercial molluscs, Endangered biota of Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Haliotis discus 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 Haliotis discus in 20 minutes

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

Frequently asked questions

What is Haliotis discus in simple terms?

Haliotis discus is a species of abalone native to Japan and Korea. Taxonomy and subspecies Haliotis discus was described by Lovell Augustus Reeve in 1846.

Why does Haliotis discus 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 Haliotis discus?

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 Haliotis discus.