biology

List of echimyids

List of echimyids 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 List of echimyids rather than just read about it. In short: Echimyidae is a family of mammals in the order Rodentia and part of the Caviomorpha parvorder. Members of this family are called echimyids or Neotropical spiny rats, and include spiny rats, tree-rats, and cave rats.

Key takeaways

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

Reference excerpt

Echimyidae is a family of mammals in the order Rodentia and part of the Caviomorpha parvorder. Members of this family are called echimyids or Neotropical spiny rats, and include spiny rats, tree-rats, and cave rats. They are found in South America and Central America, though the nutria has been introduced to the United States, Europe, and Japan. They live primarily in forests, savannas, and grasslands, though some species can be found in shrublands, wetlands, and rocky areas. They range in size from the Sao Lourenço punaré, at 12 cm (5 in) plus a 13 cm (5 in) tail, to the nutria, at 57 cm (22 in) plus a 40 cm (16 in) tail. Echimyids primarily eat a wide variety of vegetation, though some species also eat insects. Almost no echimyids have population estimates, but six species—the painted tree-rat, giant Atlantic tree-rat, Lund's Atlantic tree-rat, orange-brown Atlantic tree-rat, Moojen's Atlantic spiny rat, and Yonenaga's Atlantic spiny rat—are categorized as an endangered species, and three—the Mantiqueira Atlantic tree-rat, short-furred Atlantic tree-rat, and red-crested tree-rat—are categorized as critically endangered, while six species of Caribbean cave rat, comprising the three genera of the subfamily Heteropsomyinae, were driven to extinction since 1500 due to the European colonization of the Americas and introduction of non-native rats, with some species surviving until the 1900s. The 88 extant species of Echimyidae are divided into three subfamilies: Caterodontinae, containing a single species; Echimyinae, containing 75 species in 18 genera, and Euryzygomatomyinae, containing 12 species in 3 genera. The family Capromyidae, or the hutias, has been proposed to be merged into Echimyidae as the subfamily Capromyinae, but the proposal is not yet universally accepted. A few extinct prehistoric echimyid species have been discovered, though due to ongoing research and discoveries, the exact number and categorization is not fixed.

Conventions

The author citation for the species or genus is given after the scientific name; parentheses around the author citation indicate that this was not the original taxonomic placement. Conservation status codes listed follow the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. Range maps are provided wherever possible; if a range map is not available, a description of the echimyid's range is provided. Ranges are based on the IUCN Red List for that species unless otherwise noted. All extinct species, subspecies, or genera listed alongside extant species went extinct after 1500 CE, and are indicated by a dagger symbol: "†".

Classification

Echimyidae is a family consisting of 88 extant species in 22 genera. These species are divided into three subfamilies: Caterodontinae, containing a single species; Echimyinae, containing 75 species in 18 genera, and Euryzygomatomyinae, containing 12 species in 3 genera. Additionally, the subfamily Heteropsomyinae, containing 6 species in 3 genera, was driven extinct during the modern era due to the European colonization of the Americas, with some species surviving until the 1900s.

Family Echimyidae Subfamily Caterodontinae Genus Carterodon (Owl's spiny rat): one species Subfamily Echimyinae Genus Callistomys (painted tree-rat): one species Genus Dactylomys (bamboo rats): three species Genus Diplomys (soft-furred spiny rats): two species Genus Echimys (spiny tree-rats): three species Genus Hoplomys (armored rat): one species Genus Isothrix (brush-tailed rats): six species Genus Kannabateomys (Atlantic bamboo rat): one species Genus Lonchothrix (tuft-tailed spiny tree-rat): one species Genus Makalata (armored tree-rats): three species Genus Mesomys (spiny tree-rats): four species Genus Myocastor (nutria): one species Genus Olallamys (olalla rats): two species Genus Pattonomys (speckled tree-rats): five species Genus Phyllomys (Atlantic tree-rats): thirteen species Genus Proechimys (spiny rats): twenty-two species Genus Santamartamys (red-crested tree-rat): one species Genus Thrichomys (punarés): four species Genus Toromys (giant tree-rats): two species Subfamily Euryzygomatomyinae Genus Clyomys (broad-headed spiny rat): one species Genus Euryzygomatomys (Fischer's guiara): one species Genus Trinomys (Atlantic spiny rats): ten species Subfamily Heteropsomyinae † Genus Boromys † (Cuban cave rats): two species Genus Brotomys † (edible rats): two species Genus Heteropsomys † (Puerto Rican cave rats): two species

Echimyids The following classification is based on the taxonomy described by the reference work Mammal Species of the World (2005), with augmentation by generally accepted proposals made since using molecular phylogenetic analysis, as supported by both the IUCN and the American Society of Mammalogists.

Subfamily Carterodontinae

Subfamily Echimyinae

Subfamily Euryzygomatomyinae

Subfamily Heteropsomyinae

References

Sources

Illustrations

Worked examples

Example 1 — a first encounter with List of echimyids

Start with the simplest possible case. Write down what List of echimyids 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 List of echimyids 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 List of echimyids 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 List of echimyids

In research: List of echimyids 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 List of echimyids 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: List of echimyids is common in secondary-school and first-year university syllabi. It links to neighbouring topics Echimyidae, Lists of animal species, Lists of rodents, so understanding it makes those chapters shorter.
In everyday life: Look for List of echimyids 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 List of echimyids in 20 minutes

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

Frequently asked questions

What is List of echimyids in simple terms?

Why does List of echimyids 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 List of echimyids?

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 List of echimyids.