biology

Marmosa

Marmosa 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 Marmosa rather than just read about it. In short: The 29 species in the genus Marmosa are relatively small Neotropical members of the family Didelphidae. This genus is one of three that are known as mouse opossums.

Key takeaways

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

Reference excerpt

The 29 species in the genus Marmosa are relatively small Neotropical members of the family Didelphidae. This genus is one of three that are known as mouse opossums. The others are Thylamys (the "fat-tailed mouse opossums") and Tlacuatzin, the grayish mouse opossum. Members of the genus Marmosops used to be called "slender mouse opossums", but are now just called "slender opossums". The thirteen members of the Marmosa subgenus Micoureus, known as woolly mouse opossums, were formerly considered to be a separate genus, but were moved into Marmosa in 2009. Based on a comparison of sequences of one mitochondrial and three nuclear genes, three new subgenera, Eomarmosa, Exulomarmosa and Stegomarmosa, were recognized by Voss et al. in 2014. Eomarmosa and Exulomarmosa, as well as Marmosa and Micoureus, are thought to be sister taxa, while Stegomarmosa is viewed as sister to Marmosa plus Micoureus. Exulomarmosa is a mostly trans-Andean (west of the Andes) clade.

Phylogeny According to Pavan et al (2025), the relations of Marmosa are as follows:

Species list Subgenus Eomarmosa Voss, Gutierrez, Solari, Rossi & Jansa 2014

Marmosa rubra Tate, 1931 Subgenus Exulomarmosa Voss, Gutierrez, Solari, Rossi & Jansa 2014

Marmosa isthmica Goldman. 1912 Marmosa mexicana Merriam, 1897 Marmosa robinsoni Bangs, 1898 Marmosa simonsi Thomas, 1899 Marmosa xerophila Handley & Gordon, 1979 Marmosa zeledoni Goldman, 1911 Subgenus Marmosa J. E. Gray 1821

Marmosa macrotarsus (Wagner, 1842) Marmosa murina (Linnaeus, 1758) Marmosa tyleriana Tate 1931 Marmosa waterhousei (Tomes, 1860) Subgenus Micoureus Lesson 1842

Marmosa adleri Voss, Giarla, & Jansa, 2021 Marmosa alstoni (J. A. Allen, 1900) Marmosa constantiae Thomas, 1900 Marmosa demerarae Thomas, 1905 Marmosa germana Thomas, 1904 Marmosa jansae Voss & Giarla, 2021 Marmosa limae Thomas, 1920 Marmosa meridae Tate, 1931 Marmosa nicaraguae Thomas, 1905 Marmosa paraguayana Tate, 1931 Marmosa parda Tate, 1931 Marmosa perplexa Anthony, 1922 Marmosa phaea Thomas, 1899 Marmosa rapposa Thomas, 1899 Marmosa rutteri Thomas, 1924 Subgenus Stegomarmosa Pine, 1972

Marmosa andersoni Pine, 1972 Marmosa chachapoya Pavan, Abreu, Sánchez-Vendizú and Voss, 2025 Marmosa lepida (Thomas, 1888)

References

Illustrations

Worked examples

Example 1 — a first encounter with Marmosa

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

In research: Marmosa 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 Marmosa 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: Marmosa is common in secondary-school and first-year university syllabi. It links to neighbouring topics Marsupial genera, Marsupial stubs, Opossums, so understanding it makes those chapters shorter.
In everyday life: Look for Marmosa 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 Marmosa in 20 minutes

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

Frequently asked questions

What is Marmosa in simple terms?

The 29 species in the genus Marmosa are relatively small Neotropical members of the family Didelphidae. This genus is one of three that are known as mouse opossums.

Why does Marmosa 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 Marmosa?

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 Marmosa.