biology

Pissinatti's saki

Pissinatti's saki 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 Pissinatti's saki rather than just read about it. In short: Pissinatti's saki or Pissinatti's bald-faced saki (Pithecia pissinattii) is a disputed species of saki monkey, a type of New World monkey. It is endemic to Brazil.

Key takeaways

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

Reference excerpt

Pissinatti's saki or Pissinatti's bald-faced saki (Pithecia pissinattii) is a disputed species of saki monkey, a type of New World monkey. It is endemic to Brazil.

Taxonomy Populations in this species were formerly classified within the Rio Tapajós saki (P. irrorata), but a 2014 study described these populations as a distinct species, P. pissinattii, based on their distinctive pelage. However, a 2019 study, also analyzing pelage color variation across the range of the P. irrorata species complex, delineated only two distinctive groups corresponding to P. irrorata and Vanzolini's bald-faced saki (P. vanzolini), with the distinctive pelage used to distinguish P. pissinatii falling within the range of variation of P. irrorata. In addition, the study found that due to an unclear type locality, the holotype of P. irrorata may have been collected within the range of P. pissinatii, which would render pissinattii instantly synonymous with P. irrorata. Based on this study, the American Society of Mammalogists (tentatively, pending further phylogenetic studies) synonymized pissinattii with irrorata, but the IUCN Red List and ITIS retain pissinattii as a distinct species. This species was named after Alcides Pissinatti, a Brazilian veterinarian who is the co-founder of the Centro de Primatologia do Rio de Janeiro and vice president of the Brazilian Academy of Veterinary Sciences, and pioneered captive breeding for endangered Brazilian primates.

Distribution This species is endemic to Brazil, where it is found south of the Solimões River between the Madeira and Purus rivers. It is unknown how far south this species reaches before meeting with P. irrorata.

Description Both sexes have pink to dark red-colored faces, with the faces of older females tending towards black, and also have black fur with distinct grizzling. Males have a distinct orange ruff; younger males are highly grizzled, but older males are not as much. Females have a tanner back and more grizzling.

Status This species is thought to be threatened by logging & poaching and thus its population is thought to be declining. They are sometimes also found in the pet trade, and it is known to be kept as a free-ranging "pet" at Juma Jungle Lodge, Brazil. However, this species remains poorly-known and it is thus classified as data deficient on the IUCN Red List.

References

Worked examples

Example 1 — a first encounter with Pissinatti's saki

Start with the simplest possible case. Write down what Pissinatti's saki 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 Pissinatti's saki 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 Pissinatti's saki 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 Pissinatti's saki

In research: Pissinatti's saki 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 Pissinatti's saki 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: Pissinatti's saki is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arboreal mammals, Controversial mammal taxa, Endemic mammals of Brazil, so understanding it makes those chapters shorter.
In everyday life: Look for Pissinatti's saki 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 Pissinatti's saki in 20 minutes

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

Frequently asked questions

What is Pissinatti's saki in simple terms?

Pissinatti's saki or Pissinatti's bald-faced saki (Pithecia pissinattii) is a disputed species of saki monkey, a type of New World monkey. It is endemic to Brazil.

Why does Pissinatti's saki 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 Pissinatti's saki?

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 Pissinatti's saki.