biology

Tutusius

Tutusius 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 Tutusius rather than just read about it. In short: Tutusius is a genus of extinct tetrapod from the Devonian of South Africa, containing a single species, Tutusius umlambo. It was described from the +/- 360 myo Gondwana locality of Waterloo Farm lagerstätte on the south-eastern coast of South Africa, which at the time was located within the Antarctic Circle.

Key takeaways

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

Reference excerpt

Tutusius is a genus of extinct tetrapod from the Devonian of South Africa, containing a single species, Tutusius umlambo. It was described from the +/- 360 myo Gondwana locality of Waterloo Farm lagerstätte on the south-eastern coast of South Africa, which at the time was located within the Antarctic Circle. Together with the find of Umzantsia amazana from the same locality, this provides the first evidence that Devonian tetrapods were not restricted to the tropics as was formerly believed, and suggests that they may have been global in distribution. Waterloo Farm fossils have been metamorphosed and intensely flattened, with the bone tissue replaced by secondary metamorphic mica that is partially altered to kaolinite and chlorite during uplift. They also provide the first evidence of Devonian tetrapods from the continent of Africa, and only the second and third such taxa from Gondwana.

Taxonomy Tutusius umlambo is known from a single cleithrum (a bone of the shoulder girdle) discovered at the Waterloo Farm lagerstätte, South Africa. It was described in 2018 by palaeontologists Robert Gess and Per Erik Ahlberg in 2018. The generic name is in honour of Archbishop Desmond Tutu, in recognition of his contribution to the political and social development of South Africa. The specific name is from isiXhosa “umlambo”, meaning “river”, referring to the depositional environment. The lagerstätte dates to the Late Devonian roughly 360 million years ago. Tutusius, along with Umzantsia from the same lagerstätte, are the first evidence of Devonian tetrapods beyond 30° in latitude from the equator and on the supercontinent Gondwana (except for a single body fossil and footprint from what is now Australia). The lagerstätte would have been in the south polar region, and the two genera demonstrate early tetrapods were not restricted to the warm tropics. They also make it possible that the transition from fish to tetrapod occurred at the poles instead of the tropics.

Description

Tutusius is represented by a single bone from the shoulder girdle, the cleithrum. It tapers to a point anteroventrally and carries a single attachment scar for the scapulocoracoid, which extends along the anteroventral process, forms a v-shaped dorsal peak, and ends posteriorly in a projecting buttress. The cleithrum lacks ornament and has a distinct flexure point delineating the obliquely sloping ventral half of the bone from the more vertical dorsal half. The blade of the cleithrum is broad and thin. It differs from all other tetrapod cleithra in the presence of a projecting posterior flange with striated texture and a jagged margin, on the middle part of the blade.

References

Illustrations

Worked examples

Example 1 — a first encounter with Tutusius

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

In research: Tutusius 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 Tutusius 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: Tutusius is common in secondary-school and first-year university syllabi. It links to neighbouring topics Devonian sarcopterygians of Africa, Late Devonian sarcopterygians, Prehistoric lobe-finned fish genera, so understanding it makes those chapters shorter.
In everyday life: Look for Tutusius 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 Tutusius in 20 minutes

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

Frequently asked questions

What is Tutusius in simple terms?

Why does Tutusius 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 Tutusius?

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 Tutusius.