biology

Ovatoryctocara

Ovatoryctocara 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 Ovatoryctocara rather than just read about it. In short: Ovatoryctocara is a genus of small corynexochid trilobites from the Cambrian, that lived in what now are Siberia, China, Greenland and Canada (Newfoundland). Ovatoryctocara can be recognised by the combination of the following characters: the central raised area of the cephalon (or glabella) is approximately cylindrical and has two rows of four triangular or round pits.

Key takeaways

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

Reference excerpt

Ovatoryctocara is a genus of small corynexochid trilobites from the Cambrian, that lived in what now are Siberia, China, Greenland and Canada (Newfoundland). Ovatoryctocara can be recognised by the combination of the following characters: the central raised area of the cephalon (or glabella) is approximately cylindrical and has two rows of four triangular or round pits. The thorax only has 5 or 6 segments. The tailshield (or pygidium) has an axis (or rhachis) of 6 to 12 rings, the pleural furrows are well developed and the border is absent or narrow as a hair. It is in the subfamily Oryctocarinae.

Etymology The name of the genus is derived from its type Oryctocara ovata. Ovata refers to its oval overall shape, the Ancient Greek ὀρύκτης (oryctos) means "digger", and the Latin cara is a word for "head" or "face".

Biostratographic significance The species of the genus Ovatoryctocara occur near the lower limit of the Middle Cambrian in Siberia. The first appearance datum (FAD) of Ovatoryctocara granulata was proposed as the defining marker for the lower limit of the Wuliuan. O. granulata is moderately widespread (East Siberia, South China, Greenland, and Newfoundland).

Distribution Ovatoryctocara ovata was found in the early Middle Cambrian of the Russian Federation (Ovatoryctocara granulata zone, Nekekit, Malaya Kuonamka, Olenek, Amyday, and Muna rivers, and into the lower Kounamkites zone, Molodo River, East Siberia). Ovatoryctocara angusta angusta is present in the early Middle Cambrian of the Russian Federation (lower part of the Ovatoryctocara granulata zone, Malaya Kuonamka, and Torkukuy rivers, East Siberia). Ovatoryctocara angusta snegirevae has been encountered in the early Middle Cambrian of the Russian Federation (Ovatoryctocara granulata zone, Molodo and Malaya Kuonamka Rivers; Amaday Horizon, Maya River, East Siberia). Ovatoryctocara doliiformis has been collected from the early Middle Cambrian of the Russian Federation (upper part of the Ovatoryctocara granulata zone, Molodo River, East Siberia) Ovatoryctocara granulata occurs in the early Middle Cambrian of the Russian Federation (Ovatoryctocara granulata zone, Nekekit, Malaya Kuonamka, Olenek, Amyday, and Muna rivers, and into the lower Kounamkites zone, Molodo River, East Siberia), China (O. granulata–Bathynotus holopyga zone, late Duyunian, Kaili Formation), latest Lower Cambrian of Greenland (upper Olenellus zone, Henson Glacier Formation) and of Canada (top of the Cephalopyge notabilis zone, Branche Cove Marl Member, Eastern Cove Branche, Newfoundland).

Description Very small to small trilobite (maximum length approximately 1 centimetre or 0.39 inches) of more or less oval overall shape. The head shield (or cephalon) has natural fracture lines that end at the tip of the genal angle or the rear margin (or it has gonatoparian or proparian facial sutures). The central area of the cephalon (or glabella) is cylindrical or slightly expanded midlength and/or at the frontal lobe. The furrows that show the segmented origin, are most distinct in the form of four sets of rounded or triangular pits, sometimes with a shallow depression between them at the midline. The glabella is almost touching the front of the cephalon (or the pre-glabellar field is short). Narrow eye ridges emerge from the back of the frontal lobe outward and slightly backward (± 20°). Thorax of 5 or 6 segments. Pygidium approximately the same size (isopygous) or larger (macropygous) than the cephalon, with an axis of 6 to 12 rings, and clear pleural furrows. The border is lacking or hair thin. The surface may be smooth or has granules.

References

Worked examples

Example 1 — a first encounter with Ovatoryctocara

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

In research: Ovatoryctocara 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 Ovatoryctocara 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: Ovatoryctocara is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cambrian trilobites, Corynexochida genera, Fossils of Greenland, so understanding it makes those chapters shorter.
In everyday life: Look for Ovatoryctocara 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 Ovatoryctocara in 20 minutes

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

Frequently asked questions

What is Ovatoryctocara in simple terms?

Why does Ovatoryctocara 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 Ovatoryctocara?

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 Ovatoryctocara.