biology

Probactrosaurus

Probactrosaurus 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 Probactrosaurus rather than just read about it. In short: Probactrosaurus (meaning "before Bactrosaurus") is an extinct genus of basal hadrosauroid iguanodontian dinosaur that lived in China during the Early Cretaceous period. Discovery and species In 1959 and 1960 a Soviet-Chinese expedition uncovered the remains of a euornithopod in Inner Mongolia near Maortu.

Key takeaways

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

Reference excerpt

Probactrosaurus (meaning "before Bactrosaurus") is an extinct genus of basal hadrosauroid iguanodontian dinosaur that lived in China during the Early Cretaceous period.

Discovery and species

In 1959 and 1960 a Soviet-Chinese expedition uncovered the remains of a euornithopod in Inner Mongolia near Maortu. The type species is Probactrosaurus gobiensis, described and named by A. K. Rozhdestvensky in 1966. The generic name refers to Rozhdestvensky's hypothesis that Probactrosaurus would be the direct ancestor of Bactrosaurus, a notion now discarded. The specific name refers to the Gobi Desert. The holotype specimen, PIN 2232/1, a partial skeleton with skull, was found in layers of the Miaogou Formation (Maortu locality; originally interpreted as the nearby Dashuigou Formation). Another partial skeleton, PIN 2232-10, was found along with numerous other fragments.

In 1966 Rozhdestvensky also named a second species, Probactrosaurus alashanicus, based on fragmentary material. Its specific name refers to the Alxa League. In 2002 David B. Norman published a revision of the genus, in which he reported the holotype specimen of P. alashanicus, the back of a skull, had been lost after being dispatched from Moscow to Beijing. He concluded that the species was a synonym of P. gobiensis. In 1997 Lü Junchang named a third species, Probactrosaurus mazongshanensis, based on holotype IVPP V.11333 found in 1992. The specific name refers to the Mazong Shan region. Today, this form is seen as more closely related to Equijubus and Altirhinus rather than to P. gobiensis and is therefore commonly referred to as "Probactrosaurus" mazongshanensis. It was moved to the new genus Gongpoquansaurus in 2014.

Description

Probactrosaurus was a herbivorous dinosaur. In 2010 Gregory S. Paul estimated its length at 5.5 metres (18 feet) and its weight at one tonne. Probactrosauurus was lightly built, with relatively long and slender arms and hands and only a small thumb spike. It had a narrow snout, an elongated lower jaw and tooth batteries, each consisting of a superimposed double row of flattened cheek teeth; a third row of replacement teeth was incipient. Probably predominantly quadrupedal, it shared some common features with the later duck-billed dinosaurs.

Classification Probactrosaurus was originally assigned by Rozhdestvenky to the Iguanodontidae. Today it is seen as a basal member of the Hadrosauroidea, relatively closely related to the Hadrosauromorpha.

Illustrations

Worked examples

Example 1 — a first encounter with Probactrosaurus

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

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

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

Frequently asked questions

What is Probactrosaurus in simple terms?

Probactrosaurus (meaning "before Bactrosaurus") is an extinct genus of basal hadrosauroid iguanodontian dinosaur that lived in China during the Early Cretaceous period. Discovery and species In 1959 and 1960 a Soviet-Chinese expedition uncovered the remains of a euornithopod in Inner Mongolia near…

Why does Probactrosaurus 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 Probactrosaurus?

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 Probactrosaurus.