biology

Ukhaatherium

Ukhaatherium 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 Ukhaatherium rather than just read about it. In short: Ukhaatherium is an extinct species of mammal that lived during the upper Cretaceous about 84 to 72 million years ago in today's East Asia. It is known above all from the fossil locality Ukhaa Tolgod, Mongolia.

Key takeaways

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

Reference excerpt

Ukhaatherium is an extinct species of mammal that lived during the upper Cretaceous about 84 to 72 million years ago in today's East Asia. It is known above all from the fossil locality Ukhaa Tolgod, Mongolia. An adult Ukhaatherium has an estimated weight of about 32g and bears several similarities to lipotyphlan insectivorans such as the tenrec.

Taxonomy Ukhaatherium is a genus from the family of the Asioryctitheria, which lived in the late Cretaceous. Ukhaatherium and Asioryctes form the subfamily Asioryctinae, while Kennalestes stands somewhat outside this group.

Description Ukhaatherium nessovi, the type and only species for the genus, is known from multiple near-complete specimens. The most notable feature of the species is the presence of epipubic bones in the pelvic girdle, which have been lost in extant eutherian mammals. The loss of epipubic bones is associated with the evolution of prolonged gestation in eutherian mammalian reproduction. This means that Ukhaatherium may have had a short gestation period resulting in the birth of altricial young, like monotremes, marsupials, and extinct Mesozoic mammals such as multituberculates. This supports the hypothesis that the presence of epipubic bones is the primitive mammalian condition. Despite some primitive skull and dental traits, the skeletons of Ukhaatherium and two other asioryctitheres, Asioryctes and Kennalestes, are classed as eutherians and show several similarities with the extant lipotyphlans. Derived eutherian characteristics include the restriction of the upper ankle joint to the parasagittal plane.

Fossil findings Since the year 1990, joint expeditions of the American Museum of Natural History and the Mongolian Academy of Sciences have taken place in the Gobi desert of southern Mongolia in order to investigate upper Cretaceous and Tertiary vertebrates. More than 500 mammalian skulls (many of which with corresponding postcranial skeletons) were discovered at the Ukhaa Tolgod fossil field between 1993 and 1997, together with very well-preserved dinosaur skeletons, eggs, and embryos, birds, and lizards. Fossils of two species of basal eutherian mammal were found, including the first known Ukhaatherium specimens and a new Zalambdalestes specimen. These originate from the Djadochta Formation.

References

Worked examples

Example 1 — a first encounter with Ukhaatherium

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

In research: Ukhaatherium 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 Ukhaatherium 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: Ukhaatherium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Campanian life, Cretaceous Mongolia, Cretaceous mammals of Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Ukhaatherium 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 Ukhaatherium in 20 minutes

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

Frequently asked questions

What is Ukhaatherium in simple terms?

Why does Ukhaatherium 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 Ukhaatherium?

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 Ukhaatherium.