biology

Marsupites

Marsupites 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 Marsupites rather than just read about it. In short: Marsupites is an extinct genus of stalkless crinoids from the Santonian stage of the Late Cretaceous. Biostratigraphic significance The International Commission on Stratigraphy (ICS) had provisionally assigned the extinction of Marsupites testudinarius as the defining biological marker for the start of the Campanian stage of the Late Cretaceous, 83.6 ± 0.2 million years ago, until a new final definition was eventual…

Key takeaways

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

Reference excerpt

Marsupites is an extinct genus of stalkless crinoids from the Santonian stage of the Late Cretaceous.

Biostratigraphic significance The International Commission on Stratigraphy (ICS) had provisionally assigned the extinction of Marsupites testudinarius as the defining biological marker for the start of the Campanian stage of the Late Cretaceous, 83.6 ± 0.2 million years ago, until a new final definition was eventually ratified in 2022, based instead primarily on magnetostratigraphy.

Distribution Fossils of the genus have been found in:

Lipnik, Poland Haslam Formation, British Columbia, Canada

References

Bibliography Haggart, J. W.; Graham, R. (2018), "The crinoid Marsupites in the Upper Cretaceous Nanaimo Group, British Columbia: resolution of the Santonian-Campanian boundary in the North Pacific Province", Cretaceous Research, 87: 277–295, Bibcode:2018CrRes..87..277H, doi:10.1016/j.cretres.2017.05.029 Lach, R.; Salamon, M. A. (2016), "Late Cretaceous crinoids (Echinodermata) from the southwestern margin of the Holy Cross Mts. (southern Poland) and phylogenetic relationships among bourgueticrinids", Paläontologische Zeitschrift, 90 (3): 503–520, Bibcode:2016PalZ...90..503L, doi:10.1007/s12542-016-0313-9, PMC 5448076, PMID 28596624 Fossils (Smithsonian Handbooks) by David Ward (Page 173)

Illustrations

Worked examples

Example 1 — a first encounter with Marsupites

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

In research: Marsupites 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 Marsupites 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: Marsupites is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cretaceous British Columbia, Cretaceous echinoderms, Cretaceous echinoderms of Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Marsupites 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Marsupites” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Marsupites in 20 minutes

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

Frequently asked questions

What is Marsupites in simple terms?

Marsupites is an extinct genus of stalkless crinoids from the Santonian stage of the Late Cretaceous. Biostratigraphic significance The International Commission on Stratigraphy (ICS) had provisionally assigned the extinction of Marsupites testudinarius as the defining biological marker for the star…

Why does Marsupites 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 Marsupites?

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 Marsupites.