biology

Lepidus praecisio

Lepidus praecisio 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 Lepidus praecisio rather than just read about it. In short: Lepidus is a genus of extinct theropod from the Upper Triassic of the United States. It lived in the Otis Chalk localities of the Dockum Group in Texas, from 231 to 223 million years ago.

Key takeaways

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

Reference excerpt

Lepidus is a genus of extinct theropod from the Upper Triassic of the United States. It lived in the Otis Chalk localities of the Dockum Group in Texas, from 231 to 223 million years ago.

Discovery The locality from which Lepidus is known was discovered in the middle of February 1941 by the Works Progress Administration paleontology team in Texas. The precise geographic locality is unknown, but at the least it is known that the locality is eight miles southeast of the city of Big Spring in Howard County, Texas. Using Google Earth and USGS cartographic maps, the describing authors were able to deduce the fossils were located in the vicinity of Signal Peak. The locality is situated in the Colorado City Formation, which is constrained to about 231-223 Ma in the Carnian to Norian stages of the Upper Triassic. It was first described in 2015 by Nesbitt & Ezcurra, who decided it warranted a new taxon, which they named Lepidus praecisio. The generic name is Latin for "fascinating", and the specific name is Latin for "fragment", or "scrap". The holotype material includes a tibia, astragalus, and fibula. Other referred material includes a femur and maxilla. Nesbitt and Ezcurra stressed that the maxilla cannot be referred to Lepidus with any kind of confidence, but its morphology is most similar to neotheropods among all archosaurs known from the Colorado City Formation. The holotypic material is well-preserved and shows signs of muscle scars. The astragalus and calcaneum are clearly fused into one bone, with no visible suture. The tibia resembles that of neotheropods, in overall morphology. The shape of the tibia resembles the same in Camposaurus, Coelophysis, Tawa, Eodromaeus, and Herrerasaurus. Lepidus was one of eighteen dinosaur taxa from 2015 to be described in open access or free-to-read journals.

Classification A phylogenetic analysis was conducted, including with and without referred material. The results are shown below:

More recent phylogenetic analyses recovered this genus as a member or sister taxon of Neotheropoda outside Coelophysoidea.

References

Illustrations

Worked examples

Example 1 — a first encounter with Lepidus praecisio

Start with the simplest possible case. Write down what Lepidus praecisio 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 Lepidus praecisio 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 Lepidus praecisio 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 Lepidus praecisio

In research: Lepidus praecisio 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 Lepidus praecisio 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: Lepidus praecisio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coelophysoidea, Dinosaur species, Dinosaurs of the United States, so understanding it makes those chapters shorter.
In everyday life: Look for Lepidus praecisio 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 Lepidus praecisio in 20 minutes

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

Frequently asked questions

What is Lepidus praecisio in simple terms?

Lepidus is a genus of extinct theropod from the Upper Triassic of the United States. It lived in the Otis Chalk localities of the Dockum Group in Texas, from 231 to 223 million years ago.

Why does Lepidus praecisio 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 Lepidus praecisio?

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 Lepidus praecisio.