science

Xylosma eoapactis

Xylosma eoapactis 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 Xylosma eoapactis rather than just read about it. In short: Xylosma eoapactis is an extinct species of flowering plant in the family Salicaceae, excavated from two sites in Yamaguchi Prefecture, with an estimated temporal range spanning the Eocene. It was first described by Kazuo Huzioka and Eitaro Takahasi in 1970.

Key takeaways

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

Reference excerpt

Xylosma eoapactis is an extinct species of flowering plant in the family Salicaceae, excavated from two sites in Yamaguchi Prefecture, with an estimated temporal range spanning the Eocene. It was first described by Kazuo Huzioka and Eitaro Takahasi in 1970.

Description Known only from leaf specimens, Xylosma eoapactis had leaves that measured up to 4.5 cm (1.8 in) long and 3.2 cm (1.3 in) wide; the shape was triangular or ovate, the apex was acute, the base was subacute, rounded, or cordate, and the margins were serrulate. The leaf surface was coriaceous, and the veins came in pairs that formed a reticulate pattern; the petiole was short, about 4 mm (0.16 in) long. The leaves of Xylosma eoapactis reportedly bore a close resemblance to the extant Xylosma congesta.

Taxonomy and discovery In 1970, numerous fossil specimens were recovered from Japan’s Okinoyama Formation, where Kazuo Huzioka and Eitaro Takahasi identified Xylosma eoapactis as a new species based solely on fossilized leaves. This taxon is only known from four specimens obtained from two sites: Kami-Umeda and Fujimagari, both located in Ube, a city in Yamaguchi Prefecture.

Etymology The generic name Xylosma derives from xylon (Ancient Greek: ξύλον), meaning "wood" or "tree", and osmé (Ancient Greek: ὀσμή), meaning "smell", overall referring to the aromatic wood found in some species. The specific epithet, eoapactis, combines the prefix eo-, which refers to the Eocene epoch, and apactis, which is a reference to Apactis, a defunct genus that has been synonymized with Xylosma.

References

Worked examples

Example 1 — a first encounter with Xylosma eoapactis

Start with the simplest possible case. Write down what Xylosma eoapactis 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 Xylosma eoapactis 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 Xylosma eoapactis 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 Xylosma eoapactis

In research: Xylosma eoapactis 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 Xylosma eoapactis 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: Xylosma eoapactis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 1970, Plants described in 1970, Prehistoric angiosperms, so understanding it makes those chapters shorter.
In everyday life: Look for Xylosma eoapactis 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 Xylosma eoapactis in 20 minutes

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

Frequently asked questions

What is Xylosma eoapactis in simple terms?

Why does Xylosma eoapactis 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 Xylosma eoapactis?

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 Xylosma eoapactis.