biology

Tonganosaurus

Tonganosaurus 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 Tonganosaurus rather than just read about it. In short: Tonganosaurus (named for the town of Tong'an, Sichuan where it was found) is a genus of mamenchisaurid sauropod dinosaur, similar to Omeisaurus. It is known from one specimen consisting of twenty vertebrae, a front limb and pectoral girdle, and a complete hind limb with partial hip.

Key takeaways

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

Reference excerpt

Tonganosaurus (named for the town of Tong'an, Sichuan where it was found) is a genus of mamenchisaurid sauropod dinosaur, similar to Omeisaurus. It is known from one specimen consisting of twenty vertebrae, a front limb and pectoral girdle, and a complete hind limb with partial hip. It was discovered in the Yimen Formation, China. The horizon of the specimen and the age of the Yimen Formation is controversial. The formation has been divided into three levels, and Tonganosaurus appears to be of late Early Jurassic (Pliensbachian) in age. Tonganosaurus is the oldest known member of the mamenchisaurids, being almost 15 million years older than the next-oldest members of the group. It was first named by Li Kui, Yang Chun-Yan, Liu Jian, and Wang Zheng-Xin in 2010, and the type species is Tonganosaurus hei.

Description The ratio of the front and rear limbs is 0.80. The tibia was straight and thick, with a length 75% that of the femur. The holotype is an incomplete skeleton of an adult sauropod. The skeleton of Tonganosaurus has been calculated in size, using Omeisaurus as reference, at 11.6 metres (38 ft) long. In life, it was probably a little bigger, about 12 metres (39 ft).

History of discovery In 2007, the Chengdu University of Technology Museum based on information gathered from citizen scientists, searched for dinosaurs in Tongan Town, Huili County, Sichuan Province. They found the fossils of Tonganosaurus in the middle of the lower part of the Yimen Formation, whose age is estimated on 184.5 Ma. The fossils included about 20 vertebrae, a complete right shoulder blade and right forelimb, a distal left humerus, intact left and right ischia, a left femur, and complete right hind limb, and more than 10 scattered cervical vertebrae, ribs, tibia and claw bones. The fossils were collected in the same general area and were proportional, so they were believed to belong to the same animal. Being the first representative of the family Mamenchisauridae implies a high diversity of sauropods in the late Early Jurassic. The specimen was kept at Chengdu University of Technology Museum, with the number MCDUT 14454.

Paleoenvironment Tonganosaurus holotype comes from the Upper section of the Yimen Formation, being associated with Brontopodus tracks with also Mamenchisaurid resemblance, that maybe were made by this taxon. These layers are also filled with Ostracodans (Darwinula), Stoneworts, Bivalves (Utschamiella and Sibireconcha) and Conchostracans. The Stonewort assemblage is dominated by the genus Aclistochara (A. nuguishanensis, A. yunnanensis) associated with elements of Porochara and sporadic individuals of Stenochara, suggesting shallow-deep lake and flood environments. Apart from Tonganosaurus, Sauropodomorph remains where uncovered, likely similar to Yunnanosaurus of the same age.

References

Worked examples

Example 1 — a first encounter with Tonganosaurus

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

In research: Tonganosaurus 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 Tonganosaurus 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: Tonganosaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dinosaur genera, Dinosaurs of China, Fossil taxa described in 2010, so understanding it makes those chapters shorter.
In everyday life: Look for Tonganosaurus 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 Tonganosaurus in 20 minutes

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

Frequently asked questions

What is Tonganosaurus in simple terms?

Why does Tonganosaurus 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 Tonganosaurus?

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 Tonganosaurus.