science

Greenops

Greenops 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 Greenops rather than just read about it. In short: Greenops is a mid-sized Devonian trilobite of the order Phacopida, subfamily Asteropyginae. They are mainly reported from the mid-Devonian Hamilton Group of upstate New York and southwestern Ontario.

Key takeaways

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

Reference excerpt

Greenops is a mid-sized Devonian trilobite of the order Phacopida, subfamily Asteropyginae. They are mainly reported from the mid-Devonian Hamilton Group of upstate New York and southwestern Ontario. A similar-looking trilobite from Morocco is often mis-labelled Greenops. Greenops had schizocroidal eyes (resembling compound eyes in insects), large genal spines and short, sharp spines at the tip of each segment of the pygidium ("tail"). Greenops lived in warm, fairly deep water. In the Hamilton Group of New York, they are found with Eldredgeops, Dipleura and Bellacartwrightia, a trilobite that resembles Greenops but has much larger pygidial spines. In Ontario, they are found in the Widder Formation, which outcrops at Arkona, where they are, by far, the dominant trilobite. Greenops' average size is about 25 to 40 millimetres (1 to 1+1⁄2 inches). They were fairly common trilobites, and are easily identified. While it is rare to find a complete disarticulated body, segments and tails are fairly common. They are fairly common finds in Late Devonian limestones, especially storm deposits. They are identified by their tails, which sport several spines. They were medium to small sized trilobites, which were most likely preyed upon by ammonoids, straight cephalopods, sharks, and small placoderms, hence the defensive spines. All of these animals have been found in close association with this trilobite. Greenops can also be found in deep marine deposits, but there it is fairly rare. Greenops was a small, yet charmingly beautiful trilobite, like its close companion Eldredgeops.

Taxonomy

Species previously assigned to Greenops Some species originally described under this genus have since been reassigned to other genera.

G. alpensis = Kayserops alpensis G. arkonensis = Stummiana arkonensis G. chaconae = Breizhops chaconae G. haasi = Deloops haasi G. osismorum = Stummiana osismorum G. pleione = Bellacartwrightia pleione G. stellifer = Neometacantus stellifer G. struvei = Modellops struvei G. transversensis = Kayserops transversensis

Distribution Fossils of Greenops have been found in France, the Floresta Formation of the Altiplano Cundiboyacense, Colombia, Libya, Spain, United States (Illinois, Indiana, Iowa, New York, Pennsylvania), Canada (Arkona, Ontario) and the Caño del Oeste Formation of Venezuela.

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

Further reading Ludvigsen, Rolf, Fossils of Ontario, Part 1: The Trilobites. Toronto: Royal Ontario Museum Press, 1983

Illustrations

Worked examples

Example 1 — a first encounter with Greenops

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

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

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

Frequently asked questions

What is Greenops in simple terms?

Greenops is a mid-sized Devonian trilobite of the order Phacopida, subfamily Asteropyginae. They are mainly reported from the mid-Devonian Hamilton Group of upstate New York and southwestern Ontario.

Why does Greenops 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 Greenops?

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 Greenops.