science

Holmesina

Holmesina is a science 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 Holmesina rather than just read about it. In short: Holmesina is an extinct genus of pampathere, a group of armadillo-like xenarthrans that were distantly related to extant armadillos. Like armadillos, and unlike the other extinct branch of megafaunal cingulates the glyptodonts, the shell was made up of flexible plates which allowed the animal to move more easily.

Key takeaways

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

Reference excerpt

Holmesina is an extinct genus of pampathere, a group of armadillo-like xenarthrans that were distantly related to extant armadillos. Like armadillos, and unlike the other extinct branch of megafaunal cingulates the glyptodonts, the shell was made up of flexible plates which allowed the animal to move more easily.

Holmesina individuals were much larger than any modern armadillo: They could reach a length of 2 metres (6.6 ft), and a weight of 227 kilograms (500 lb), while the modern giant armadillo does not attain more than 54 kilograms (119 lb).

Taxonomy Joseph Leidy initially described Holmesina fossils from Florida as Glyptodon septentrionalis in 1889. However, shortly after a close relationship with the pampatheriids was realized, wherein the finds were reassigned to the South American Pampatherium ("Chlamytherium") humboldtii, therein revised to its own species, Chlamytherium septentrionalis, by Elias Howard Sellards in 1915. After additional fossils from Texas were described, George Gaylord Simpson assigned the finds to its own genus, Holmesina, in 1930.

Distribution They traveled north during the faunal interchange, and adapted well to North America, like the ground sloths, glyptodonts, armadillos, capybaras, and other South American immigrants. During the Late Pleistocene, Holmesina dispersed from North America back into South America, as evidenced by the morphological similarity of Late Pleistocene species in South America. Their fossils are found from Brazil to the United States, mostly in Texas and Florida.

Diet Holmesina species were herbivores that grazed on coarse vegetation; armadillos are mostly insectivorous or omnivorous. H. paulacoutoi was a generalist plant-eater but had a preference for C4 plants; it has been estimated based on δ13C and δ18O values from fossils from Sergipe in Brazil that grasses made up 55% of the diet of H. paulacoutoi, with a further 29% being fruits and 16% being leaves.

Palaeopathology Three H. cryptae specimens have been described bearing evidence of bacterial and fungal infections, along with sand flea ectoparasitism.

References

Further reading J. C. Cisneros. 2005. New Pleistocene vertebrate fauna from El Salvador. Revista Brasileira de Paleontologia 8(3):239-255 P. J. Gaudioso, G. M. Gasparini, and R. M. Barquez. 2016. Paleofauna del Pleistoceno de Termas de Rio Hondo, Santiago del Estero, Argentina. Ameghiniana 53(6):54-54 J. I. Mead, S. L. Swift, R. S. White, H. G. McDonald, and A. Baez. 2007. Late Pleistocene (Rancholabrean) glyptodont and pampathere (Xenarthra, Cingulata) from Sonora, Mexico. Revista Mexicana de Ciencias Geológicas 24(3):439-449

Illustrations

Worked examples

Example 1 — a first encounter with Holmesina

Start with the simplest possible case. Write down what Holmesina claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Holmesina 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 Holmesina 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 Holmesina

In research: Holmesina appears in science 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 Holmesina 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: Holmesina is common in secondary-school and first-year university syllabi. It links to neighbouring topics Blancan, Ensenadan, Fossil taxa described in 1930, so understanding it makes those chapters shorter.
In everyday life: Look for Holmesina 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 Holmesina in 20 minutes

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

Frequently asked questions

What is Holmesina in simple terms?

Why does Holmesina matter?

Because it connects several science 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 Holmesina?

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 Holmesina.