biology

Ptychotherates

Ptychotherates 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 Ptychotherates rather than just read about it. In short: Ptychotherates (lit. 'fold hunter') is an extinct genus of saurischian dinosaur known from the Late Triassic (Norian or Rhaetian ages) Chinle Formation of Ghost Ranch, New Mexico, United States. The genus contains a single species, Ptychotherates bucculentus, known from a partial skull.

Key takeaways

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

Reference excerpt

Ptychotherates (lit. 'fold hunter') is an extinct genus of saurischian dinosaur known from the Late Triassic (Norian or Rhaetian ages) Chinle Formation of Ghost Ranch, New Mexico, United States. The genus contains a single species, Ptychotherates bucculentus, known from a partial skull. The jugal bone of the skull is unusually tall, deeper than in any other Triassic dinosaur. Ptychotherates is closely related to Chindesaurus, Daemonosaurus, and Tawa, together forming the clade Morphoraptora within Herrerasauria.

Discovery and naming The Ptychotherates fossil material was discovered in the Coelophysis Quarry at Ghost Ranch, northern New Mexico, United States in 1982. This fossil site, representing outcrops of the Chinle Formation, preserves a mass burial of a coeval Triassic fauna, dominated by fossils of Coelophysis bauri. The specimen is housed in the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania, where it is permanently accessioned as specimen CM 31368. The specimen consists of a nearly complete, albeit somewhat disarticulated, skull. In 2026, Simba Srivastava and Sterling J. Nesbitt described Ptychotherates bucculentus as a new genus and species of saurischian dinosaur based on these fossil remains, establishing CM 31368 as the holotype specimen. The generic name, Ptychotherates, combines the Greek words ptycho, meaning 'fold' and therates, meaning 'hunter'. This alludes to both the challenge of rearticulating the disarticulated holotype skull, as well as the likely carnivorous behavior of the animal. The specific name, bucculentus, is a Latin word meaning 'with full cheeks', referring to the species' unusually tall jugal.

Classification

To test the affinities and relationships of Ptychotherates, Srivastava and Nesbitt (2026) included it in updated versions of two independent phylogenetic matrices: those of Ezcurra et al. (2023) and Griffin et al. (2022). Both recovered Ptychotherates within the Herrerasauria, in a clade alongside Chindesaurus, Daemonosaurus, and Tawa. Srivastava & Nesbitt named this clade Morphoraptora (lit. 'form robber', or, more loosely, 'bodysnatcher'), referencing the similarity of these animals to the Theropoda, despite not being a part of it. The results using the dataset of Ezcurra et al. (2023) are shown in the cladogram below:

References

Illustrations

Worked examples

Example 1 — a first encounter with Ptychotherates

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

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

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

Frequently asked questions

What is Ptychotherates in simple terms?

Why does Ptychotherates 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 Ptychotherates?

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 Ptychotherates.