biology

Schwagerina

Schwagerina 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 Schwagerina rather than just read about it. In short: Schwagerina is an extinct genus of fusulinoidean Foraminifera that is used as an Early Permian index fossil. The overall shape of the shell or test is fusiform to subcylindrical, the spirotheca, or outer test wall, is thick, and composed of tectum and alveolar keriotheca; the septa are fluted throughout the length of the shell, intense to top of chambers in some, only in lower parts in others; axial fillings highly…

Key takeaways

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

Reference excerpt

Schwagerina is an extinct genus of fusulinoidean Foraminifera that is used as an Early Permian index fossil. The overall shape of the shell or test is fusiform to subcylindrical, the spirotheca, or outer test wall, is thick, and composed of tectum and alveolar keriotheca; the septa are fluted throughout the length of the shell, intense to top of chambers in some, only in lower parts in others; axial fillings highly variable, chomata distinct or thin and discontinuous. Tectum is the thin, dark, dense outer layer of the spirotheca, Keriotheca is the thicker, honeycomb-like alveolar, inner layer. Chomata are mounds secreted on the floor of the chamber that connect either side of the tunnel, which interconnects the chambers. Daixina Ryzovskaya, 1949, is given (Loeblich and Tappan 1964) as a synonym of Schwagerina. Three genera are similar to Schwagerina, but differ in their internal details. They are: Paraschagerina, Dunbar and Skinner 1939, from the Lower Permian. The spirotheca is structured as in schwagerina; the first two or three volutions tightly coiled and elongate-fusiform, the outer volutions distinctly inflated-fusiform; septa highly fluted throughout. Pseudoschwagerina Dunbar and skinner, 1936, Lower Permia. Shell inflated-fusimform; first two or three volutions tightly coiled, outer ones inflated; spirotheca as in Schwaterina. Septa are fluted at the base, close speced at first, wide spaced later. Occidentoschagerina is given as a junior synonym. Rugososchwagerina Milukho-Maklay, 1959, Upper Permian. Shell inflated-fusiform. First three or four volutions tightly coiled, elongate-fusiform, outer volutions greatly inflated. Spirotheca as with Schwagerina, moderately thin in the tightly coiled portion and next one or two volutions, becoming thick and more coarsely alveolar in the outer two or three. Septa are close spaced in the first three or four volutions, wide spaced in the next two or three, and again close spaced in the outermost.

References

Further reading Davydov, Vladimir; Haig, David; McCartain, Eujay (May 2014). "Latest Carboniferous (Late Gzhelian) Fusulinids from Timor Leste and Their Paleobiogeographic Affinities". Journal of Paleontology. 88 (3): 588–605. doi:10.1666/13-007. Alfred R. Loeblich Jr and Helen Tappan, 1988. Forminiferal Genera and their Classification. Van Nostrand Reinhold.

Worked examples

Example 1 — a first encounter with Schwagerina

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

In research: Schwagerina 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 Schwagerina 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: Schwagerina is common in secondary-school and first-year university syllabi. It links to neighbouring topics Foraminifera genera, Fusulinida, Index fossils, so understanding it makes those chapters shorter.
In everyday life: Look for Schwagerina 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 Schwagerina in 20 minutes

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

Frequently asked questions

What is Schwagerina in simple terms?

Why does Schwagerina 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 Schwagerina?

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 Schwagerina.