biology

Neptunidraco

Neptunidraco 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 Neptunidraco rather than just read about it. In short: Neptunidraco (meaning "Neptune's dragon") is an extinct genus of metriorhynchid thalattosuchian that lived during the middle Jurassic period (late Bajocian to earliest Bathonian stage) in what is now northeastern Italy. It is currently the oldest known metriorhynchid, an extinct group of fully marine reptiles related to modern crocodylians.

Key takeaways

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

Reference excerpt

Neptunidraco (meaning "Neptune's dragon") is an extinct genus of metriorhynchid thalattosuchian that lived during the middle Jurassic period (late Bajocian to earliest Bathonian stage) in what is now northeastern Italy. It is currently the oldest known metriorhynchid, an extinct group of fully marine reptiles related to modern crocodylians.

History and Taxonomy The type specimen was recovered in the 1950s near the Italian town of Portomaggiore. The specimen, informally known as the "Portomaggiore crocodile", comprises a partial skeleton, including an incomplete skull with mandible, preserved in nodular limestone of the Rosso Ammonitico Veronese Formation. It represents the most complete metriorhynchid specimen known from Italy. Before its formal description, the specimen was provisionally assigned to an indeterminate species of either Metriorhynchus or Geosaurus. In 2011, Italian paleontologists Andrea Cau and Federico Fanti named this specimen as the new genus Neptunidraco, containing the single species Neptunidraco ammoniticus. The full name translates to "Neptune’s dragon from the Rosso Ammonitico Veronese Formation", in reference to the Roman sea god Neptune and the geologic formation it was discovered in. In 2013, Cau suggested that the possible specimen of this genus, MGP-PD 26552 (catalog erroneously spelled as 6552, the intended type specimen of the informal name "Steneosaurus barettoni"), would have measured 3.7 m (12 ft) in total body length, though the 2023 study suggested that the specimen belongs to a separate indeterminate metriorhynchid.

Classification Neptunidraco is a member of the metriorhynchid subfamily called Geosaurinae, a group generally consisting of large marine predators that were adapted to open-ocean life. It is closely related to, but not part of, the more derived tribe Geosaurini, whose members were the largest and exhibited the most pronounced morphological adaptations for predation on large-bodied prey. The cladogram below is from an analysis by Léa Girard and colleagues in their description of Torvoneustes jurensis.

References

Illustrations

Worked examples

Example 1 — a first encounter with Neptunidraco

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

In research: Neptunidraco 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 Neptunidraco 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: Neptunidraco is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 2011, Fossils of Italy, Middle Jurassic crocodylomorphs, so understanding it makes those chapters shorter.
In everyday life: Look for Neptunidraco 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Neptunidraco” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Neptunidraco in 20 minutes

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

Frequently asked questions

What is Neptunidraco in simple terms?

Why does Neptunidraco 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 Neptunidraco?

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 Neptunidraco.