science

Parvinatator

Parvinatator is a science 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 Parvinatator rather than just read about it. In short: Parvinatator (lit. 'little swimmer') is an extinct genus of small ichthyopterygian marine reptile that lived during the Early to Middle Triassic. Its fossils have been found in British Columbia, Canada.

Key takeaways

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

Reference excerpt

Parvinatator (lit. 'little swimmer') is an extinct genus of small ichthyopterygian marine reptile that lived during the Early to Middle Triassic. Its fossils have been found in British Columbia, Canada.

Geological information The only known Parvinatator fossil was located in an unknown horizon from the Sulfur Mountain Formation in a talus deposit, so its exact geological age is unknown. Best estimates place the fossil somewhere between the Olenekian and Ladinian age around 251-235 mya. Other small ichthyosaurs have been found nearby including Grippia, Utatsusaurus, and Phalarodon.

Discovery Parvinatator wapitiensis was discovered in the Sulfur Mountain Formation in British Columbia, Canada, by Elisabeth Nicholls and Don Brinkman in 1995. The only fossil recovered of this genus is a partial skull and two forefins. The skull has been tectonically deformed, partially dis-articulated and broken with the posterior section rotated forward into the orbit. The left forefin is well preserved with only minor overlapping and breakage, while the right forefin is heavily overlapped and broken.

Description and paleobiology

Based on analysis of tooth size relative to the skull width, Parvinatator is estimated to be less than 1 meter long, approximately the same size and general shape of other basal ichthyosaurs, although it is unknown if Parvinatator lacked a dorsal fin like Utatsusaurus and Grippia. Also like other early ichthyosaurs, Parvinatator most likely used an eel-like lateral body movement for propulsion, known as anguilliform. Based on jaw size and tooth shape, Parvinatator is thought to have feed on small fish and cephalopods similarly to other basal ichthyosaurs, as opposed to hard shelled organisms such as mollusks and clams. Ichthyosaurs typically had large eyes suggesting they would hunt in the dark, either at night or in deep water. After the skull's dis-articulated orbit was reconstructed, it matched the approximate shape and typical size of other ichthyosaurs eyes.

Skull The fossil of the skull is small, measuring approximately 15 cm in width by 10 cm in height. The skull had been dis-articulated, broken and tectonically deformed, but was reconstructed by Ryosuke Motani, leading to several differences from Nicholls and Brinkman's original description, including; the presence of the squamosal, quadratojugal, and a reduced supratemporal, a lack of contact between the prefrontal and postfrontal, as well as between the jugal and quadratojugal (which was previously identified as the squamosal). Other diagnostic characteristics of the Parvinatator skull are as follows:

The retroarticular process, composed of the articular, surangular, and angular, is present and well developed. This is suggested to be a derived trait for all ichthyosaurs. The quadratojugal is high and narrow, laterally covering the quadrate. The jugal and quadratojugal have a deep notch between them, agreeing with the lack of a lower temporal fenestra or lower zygomatic arch as in all other ichthyosaurs. The postorbital is enlarged and overlaps the jugal along the posterior of the orbit, forming a natural articulation point. The orbit is oval in shape, being longer than tall. The external naris is enclosed by the premaxilla, maxilla and nasal bone, separate from a well developed lacrimal.

Forefin

Unlike some basal ichthyosaurs, Parvinatator's forefin appears well adapted for aquatic life, although it was probably used for controlling pitch rather than locomotion. On the well preserved left forefin of Parvinatator the ulna is reduced in both length and width and smaller than the radius. Several bones of digits 4 and 5 are fused together as well.

Phylogeny There is some disagreement about the exact location of Parvinatator among its relatives. The following phylogeny by Motani places Parvinatator with Utatsusaurus as basal ichthyopterygians but not true ichthyosaurs.

However, according to Maisch and Matzke in 2000, Parvinatator is a true ichthyosaur and more derived than Utatsusaurus and Grippia.

See also List of ichthyosaurs Timeline of ichthyosaur research

References

Illustrations

Worked examples

Example 1 — a first encounter with Parvinatator

Start with the simplest possible case. Write down what Parvinatator claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Parvinatator 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 Parvinatator 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 Parvinatator

In research: Parvinatator appears in science 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 Parvinatator 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: Parvinatator is common in secondary-school and first-year university syllabi. It links to neighbouring topics Early Triassic reptiles of North America, Fossil taxa described in 1995, Fossils of British Columbia, so understanding it makes those chapters shorter.
In everyday life: Look for Parvinatator 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 Parvinatator in 20 minutes

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

Frequently asked questions

What is Parvinatator in simple terms?

Why does Parvinatator matter?

Because it connects several science 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 Parvinatator?

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 Parvinatator.