science

Viaphacops

Viaphacops 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 Viaphacops rather than just read about it. In short: Viaphacops is a genus of trilobites in the order Phacopida, family Phacopidae, that lived during the Middle Devonian, and is known from North and South America (Bolivia, Floresta Formation, Altiplano Cundiboyacense, Colombia, and Venezuela), Asia (Central Kazakhstan and Far Eastern Russia). Description Like in all sighted Phacopina, the eyes of Viaphacops are compounded of very large, separately set lenses without a…

Key takeaways

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

Reference excerpt

Viaphacops is a genus of trilobites in the order Phacopida, family Phacopidae, that lived during the Middle Devonian, and is known from North and South America (Bolivia, Floresta Formation, Altiplano Cundiboyacense, Colombia, and Venezuela), Asia (Central Kazakhstan and Far Eastern Russia).

Description Like in all sighted Phacopina, the eyes of Viaphacops are compounded of very large, separately set lenses without a common cornea (so called schizochroal eyes), and like almost all other Phacopina, the articulate mid-length part of the body (or thorax) in Viaphacops has 11 segments, the side lobes (or pleurae) are furrowed, and the articulating facets distinct. The natural fracture lines (sutures) of the head run along the top edges of the compound eye. From the back of the eye these cut to the side of the head (proparian) and not to the back. In front of the eye, the right and left facial sutures connect in front of the inflated glabella and consequently the free cheeks (or librigenae) are yoked as a single piece. The part of the skeleton that is "tucked under" (the doublure) has no sutures crossing it to form a rostral plate. The tailshield (or pygidium) is always smaller than the headshield (or cephalon), a situation called micropygous. In the Phacopidae a merger of the anterior and the two pairs of neighbouring lobes of the glabella forms a frontal lobe that expands forward and can be inflated and overhanging the frontal border. To the back of the glabella two furrows (or sometimes one) cross the glabella forming two rings ("intercalating/pre-occipital ring" and "occipital ring"). The cephalon does not end in genal spines. The side lobes of the thorax (or pleurae, singular pleura) have rounded ends. The pygidium is well rounded, semicircular or shorter, with an entire margin, and without lateral and posterior projections. In many Phacopidae, where the facial sutures are apparently continuous and well developed, they were evidently nonfunctional in ecdysis, since no separate free cheeks can be found. Viaphacops is distinguished from related genera because the preoccipital furrow is merged with occipital furrow to form a deep broad furrow thus having obliterated the intercalating ring. The occipital ring itself is usually narrow. The vincular furrow, a trough in the cephalic doublure (ventral side of the border of the head) is deep, with a prominent inner border. The eyes are mostly moderate in size, but sometimes large. The tailshield is usually wide and weakly segmented. The surface of the glabella has fairly large tubercles.

References

Bibliography Morzadec, Pierre; Mergl, Michal; Villarroel, Carlos; Janvier, Philippe; Racheboeuf, Patrick R. (2015), "Trilobites and inarticulate brachiopods from the Devonian Floresta Formation of Colombia: a review" (PDF), Bulletin of Geosciences, 90: 331–358, doi:10.3140/bull.geosci.1515, retrieved 2017-04-04

Illustrations

Worked examples

Example 1 — a first encounter with Viaphacops

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

In research: Viaphacops 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 Viaphacops 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: Viaphacops is common in secondary-school and first-year university syllabi. It links to neighbouring topics Devonian Bolivia, Devonian Colombia, Devonian Venezuela, so understanding it makes those chapters shorter.
In everyday life: Look for Viaphacops 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 Viaphacops in 20 minutes

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

Frequently asked questions

What is Viaphacops in simple terms?

Why does Viaphacops 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 Viaphacops?

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 Viaphacops.