biology

Pampadromaeus

Pampadromaeus 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 Pampadromaeus rather than just read about it. In short: Pampadromaeus is an extinct genus of basal sauropodomorph dinosaurs known from the Late Triassic (Carnian) Santa Maria Formation of the Paraná Basin in Rio Grande do Sul, southern Brazil. Discovery Pampadromaeus is known only from the holotype specimen ULBRA-PVT016, a disarticulated, partial but well preserved skeleton from a single individual which includes most of the skull bones and the lower jaws; dorsal, sacral…

Key takeaways

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

Reference excerpt

Pampadromaeus is an extinct genus of basal sauropodomorph dinosaurs known from the Late Triassic (Carnian) Santa Maria Formation of the Paraná Basin in Rio Grande do Sul, southern Brazil.

Discovery Pampadromaeus is known only from the holotype specimen ULBRA-PVT016, a disarticulated, partial but well preserved skeleton from a single individual which includes most of the skull bones and the lower jaws; dorsal, sacral and caudal vertebrae; elements of the shoulder girdle and the forelimbs, an ilium and elements of the hindlimbs. It was collected in the upper Hyperodapedon biozone from the Alemoa Member of the Santa Maria Formation (Rosário do Sul Group) in the "Janner" (also known as "Várzea do Agudo") locality, geopark of Paleorrota, dating to the Carnian faunal stage of the early Late Triassic, about 230–228 Ma ago. A U-Pb (uranium decay) dating found that the Santa Maria Formation dated around 233.23 Ma, putting it 1.5 million years older than the Ischigualasto Formation, and making the two formations approximately equal as the earliest dinosaur localities.

Description

Pampadromaeus was a small bipedal animal. It shows a mosaic of basal and derived traits. It differs from other sauropodomorphs by a combination of characters. Some of these are shared with members of the Theropoda: the premaxilla is pointed downwards forming a subnarial gap with the maxilla and the anterior-most teeth are unserrated; in the location where with theropods the fenestra promaxillaris is positioned, a small depression is present. Basal traits consist of a large skull, a short thighbone, the possession of just two sacral vertebrae and the presence of fifteen teeth in the pterygoid. There were four teeth in the premaxilla and about twenty in both the maxilla and the lower jaw for a total of eighty-eight. The teeth were large, elongated, lanceolate, slightly recurved, sharply pointed and coarsely serrated. The lower leg was much longer than the thighbone, indicating a cursorial lifestyle. In 2022, Tito Aureliano and colleagues performed a micro-computed tomography scan on the postcranial skeletons of some of the earliest saurischian dinosaurs that lived during the late Carnian including the herrerasaurid Gnathovorax with sauropodomorphs Pampadromaeus and Buriolestes, which showed that the invasive air sac system was absent and that their bones were not pneumatised. These results indicate that pneumatisation in archosaur groups (pterosaurs, theropods and sauropodomorphs) are not homologous, but are traits that independently evolved at least 3 times.

Etymology Pampadromaeus was first named by Sergio F. Cabreira, Cesar L. Schultz, Jonathas S. Bittencourt, Marina B. Soares, Daniel C. Fortier, Lúcio R. Silva and Max C. Langer in 2011 and the type species is Pampadromaeus barberenai. The generic name is derived from Quechua pampa, "plain", in reference to the present landscape of the site, and Greek δρομεύς, dromeus, "runner", referring to the cursorial habits; the Latinised spelling variant dromaeus is used. The specific name honours the Brazilian paleontologist Mário Costa Barberena.

Phylogeny Pampadromaeus was found to be a basal sauropodomorph in four different cladistic analyses. The describers emphasized however, that this position was not strongly supported, showing the difficulties of determining the affinities of such early forms with the basal Dinosauromorpha, Saurischia, Sauropodomorpha and Theropoda.

References

Bibliography Cabreira, Sérgio F.; Schultz, Cesar L.; Bittencourt, Jonathas S.; Soares, Marina B.; Fortier, Daniel C.; Silva, Lúcio R.; Langer, Max C. (2011), "New stem-sauropodomorph (Dinosauria, Saurischia) from the Triassic of Brazil" (PDF), Naturwissenschaften, 98 (12): 1035–1040, Bibcode:2011NW.....98.1035C, doi:10.1007/s00114-011-0858-0, PMID 22083251, retrieved 2019-03-29 Langer, Max Cardoso; McPhee, Blair Wayne; Marsola, Júlio César de Almeida; Da Silva, Lúcio Roberto; Cabreira, Sérgio Furtado (2019), "Anatomy of the dinosaur Pampadromaeus barberenai (Saurischia—Sauropodomorpha) from the Late Triassic Santa Maria Formation of southern Brazil", PLoS ONE, 14 (2): 1–64, Bibcode:2019PLoSO..1412543L, doi:10.1371/journal.pone.0212543, PMC 6382151, PMID 30785940 Langer, M.C.; Ramezani, J.; Da Rosa, Á.A.S. (2018), "U-Pb age constraints on dinosaur rise from south Brazil" (PDF), Gondwana Research, 53: 133–140, Bibcode:2018GondR..57..133L, doi:10.1016/j.gr.2018.01.005, retrieved 2019-03-29

Illustrations

Worked examples

Example 1 — a first encounter with Pampadromaeus

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

In research: Pampadromaeus 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 Pampadromaeus 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: Pampadromaeus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carnian dinosaurs, Dinosaur genera, Dinosaurs of Brazil, so understanding it makes those chapters shorter.
In everyday life: Look for Pampadromaeus 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 Pampadromaeus in 20 minutes

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

Frequently asked questions

What is Pampadromaeus in simple terms?

Pampadromaeus is an extinct genus of basal sauropodomorph dinosaurs known from the Late Triassic (Carnian) Santa Maria Formation of the Paraná Basin in Rio Grande do Sul, southern Brazil. Discovery Pampadromaeus is known only from the holotype specimen ULBRA-PVT016, a disarticulated, partial but we…

Why does Pampadromaeus 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 Pampadromaeus?

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 Pampadromaeus.