biology

Molaria

Molaria 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 Molaria rather than just read about it. In short: Molaria is a genus of Cambrian arthropod, the type species M. spinifera is known from the Middle Cambrian Burgess Shale. 144 specimens of Molaria are known from the Greater Phyllopod bed, where they comprise 0.27% of the community. A second species M. steini was described from the Sirius Passet in Greenland in 2017.

Key takeaways

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

Reference excerpt

Molaria is a genus of Cambrian arthropod, the type species M. spinifera is known from the Middle Cambrian Burgess Shale. 144 specimens of Molaria are known from the Greater Phyllopod bed, where they comprise 0.27% of the community. A second species M. steini was described from the Sirius Passet in Greenland in 2017.

Etymology The genus name derives from “Molar”, the name of a mountain peak east of the Valley of the Ten Peaks in Alberta, Canada, which in turn was so named by James Hector in 1859 because the shape of the mountain resembles a molar tooth. The specific name of the type species, spinifera, comes from Latin spinifer “spine-bearing.”

Description

The body of Molaria consisted of a head shield (cephalon), a trunk consisting of eight sections (tergites), and a telson, which included a short ventral spine and a long posterior spine. Three pairs of legs were beneath the cephalon and another eight pairs were attached to the trunk. Eyes were lacking, but a pair of short antennae was present on the cephalon. Specimens of Molaria ranged from 8 to 26 mm in length from cephalon to telson, with the posterior spine slightly longer than the body length.

Affinity Molaria was superficially similar to Habelia, another Burgess Shale arthropod with a long tail spine, but which possessed 12 trunk tergites. It is currently considered a member of Artiopoda.

References

External links "Molaria spinifera". Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011. Archived from the original on 2020-11-12.

Illustrations

Worked examples

Example 1 — a first encounter with Molaria

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

In research: Molaria 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 Molaria 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: Molaria is common in secondary-school and first-year university syllabi. It links to neighbouring topics Artiopod genera, Artiopoda, Burgess Shale fossils, so understanding it makes those chapters shorter.
In everyday life: Look for Molaria 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Molaria” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Molaria in 20 minutes

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

Frequently asked questions

What is Molaria in simple terms?

Why does Molaria 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 Molaria?

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 Molaria.