biology

Laornis

Laornis 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 Laornis rather than just read about it. In short: Laornis is a genus of a prehistoric neornithine birds, known only from Specimen YPM 820, a single tibiotarsus leg bone discovered in the late 19th century. Consequently, the genus is monotypic, containing only the species Laornis edvardsianus.

Key takeaways

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

Reference excerpt

Laornis is a genus of a prehistoric neornithine birds, known only from Specimen YPM 820, a single tibiotarsus leg bone discovered in the late 19th century. Consequently, the genus is monotypic, containing only the species Laornis edvardsianus. Regarding its scientific name, Laornis means "stone bird", from Ancient Greek lao "stone" + ornis "bird". edvardsianus honors Alphonse Milne-Edwards, to compliment the French paleontologist on his landmark study Recherches Anatomiques et Paleontologiques pour servir a l'Histoire des Oiseaux Fossiles de la France, the second part of which was nearing completion at that time. It was found in Late Cretaceous or Early Paleocene sediments of the Hornerstown Formation at the Birmingham Marl Pits, Pemberton Township, New Jersey, United States (39°59'N, 74°43'W). The deposits were laid down at about 66–63 Ma (million years ago). The bone is rather distinct but not very diagnostic. Its general shape suggests that Laornis was a semi-aquatic bird with longish legs and a body at least the size of a large goose. It may have been a wading bird, in which case it stood probably around one meter (3–4 ft) tall in life, depending on how long its legs and neck were exactly, which of course cannot be determined from the one known bone. On the other hand, it might have been a larger seabird with proportionally shorter legs. It has variously been allied with the Charadriiformes and the Gruiformes, and is tentatively placed in a family of its own, Laornithidae. It may be considered some kind of basal gruiform, or more probably part of an ancestral lineage related to the common ancestor of gruiform, charadriiform, and/or any or all other modern "wading" bird families. It might have been one of the extinct stilt-legged waterfowl of the Presbyornithidae, and it cannot even be excluded that it was an ancient pseudotooth bird, seabirds of unclear affiliation that evolved to immense proportions in the Neogene but by the time of Laornis probably were mostly the size of a large petrel.

References

External links Topographic map of the type locality from TopoQuest

Worked examples

Example 1 — a first encounter with Laornis

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

In research: Laornis 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 Laornis 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: Laornis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bird genera, Birds, Birds of North America, so understanding it makes those chapters shorter.
In everyday life: Look for Laornis 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 Laornis in 20 minutes

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

Frequently asked questions

What is Laornis in simple terms?

Why does Laornis 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 Laornis?

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 Laornis.