biology

Tariccoia

Tariccoia 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 Tariccoia rather than just read about it. In short: Tariccoia is a genus of nektaspid arthropods belonging to the family Liwiidae, known from fossils found in Ordovician strata in Sardinia and Morocco. It is between 2.5 centimetres (0.98 in) and 6 centimetres (2.4 in) long.

Key takeaways

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

Reference excerpt

Tariccoia is a genus of nektaspid arthropods belonging to the family Liwiidae, known from fossils found in Ordovician strata in Sardinia and Morocco. It is between 2.5 centimetres (0.98 in) and 6 centimetres (2.4 in) long. It has a headshield (or cephalon) wider than the tailshield (pygidium), and in between them three (or four?) thoracic body segments (somites).

Etymology The name of the genus references the Sardinian paleontologist M. Taricco. The species was named after the Riu is Arrus Member, the deposit in which it was found.

Description

Tariccoia arrusensis is between 2.5 and 6 cm along the axis, almost half a wide as long. The dorsal exoskeleton consists of a cephalon, a pygidium and two or three thoracic somites with articulating half-rings, all non-calcified. The cephalon is sub-semicircular, widest near the rounded genal angles. The cephalon is wider than the pygidium. Eyes are absent. Antennas are not known. The body is constricted at the two or three thoracic somites, so the animal gives the impression to have a waist. The pygidium is widest before midlength. The pygidium has a mid-ridge.

Differences with other Liwiidae Tariccoia arrusensis differs from Liwia by having 3 clearly visible thoracic somites (perhaps a 4th is obscured by the cephalon) instead of 4. T. arrusensis has a mid-length ridge on the pygidium, which is not known from Liwia. Tariccoia also has an oval pygidium with an entire margin, while Liwia has five pairs of modest marginal spines, a straight anterior border and a concave posterior border. T. arrusensis differs from Buenaspis forteyi, that has a cephalon and pygidium that are not wider than its 6 thoracic somites. The pygidium of B. forteyi is wider than long, with a straight anterior border. Buenaspis and Tariccoia have an entire margin and a mid-ridge on the pygidium in common. T. arrusensis differs from Soomaspis splendida, that has an oval cephalon, and lacks visible segmentation of the pygidium. Tariccoia and Soomaspis both have a broad doublure and lack a lengthwise mid-ridge on the cephalon. In both species the pygidium is about as long as wide, but in Soomaspis the widest point is around midlength, while Tariccoia is widest in the frontal half. The species share 3 thoracic somites, an entire margin and a mid-ridge on the pygidium.

Distribution T. arrusensis has been collected from the Upper Ordovician (Sandbian to Katian) Riu is Arrus Member, Monte Argentu Formation, Sardinia, Italy. T. tazagurtensis has been collected from the Fezouata Formation of Morocco dating to the Early Ordovician (Tremadocian).

Habitat Tariccoia arrusensis is thought to have lived in a restricted reduced oxygen marine environment close to shore such as a lagoon or a bay in what was then the cold high-latitude margin of southern Gondwana, where it was locally abundant alongside macroscopic algae. Tariccoia tazagurtensis also lived in cold waters in high-latitude southern Gondwana, but it was an extremely rare member of the fauna and lived in open shallow-marine conditions.

References

Illustrations

Worked examples

Example 1 — a first encounter with Tariccoia

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

In research: Tariccoia 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 Tariccoia 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: Tariccoia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Artiopod genera, Fossil taxa described in 1990, Fossils of Italy, so understanding it makes those chapters shorter.
In everyday life: Look for Tariccoia 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 Tariccoia in 20 minutes

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

Frequently asked questions

What is Tariccoia in simple terms?

Why does Tariccoia 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 Tariccoia?

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 Tariccoia.