biology

Opisthoteuthis pluto

Opisthoteuthis pluto 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 Opisthoteuthis pluto rather than just read about it. In short: Opisthoteuthis pluto is a deep-sea cirrate octopus found off southern Australia in the bathyal zone. The species was described by S.

Key takeaways

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

Reference excerpt

Opisthoteuthis pluto is a deep-sea cirrate octopus found off southern Australia in the bathyal zone. The species was described by S. Stillman Berry in 1918, and has recently been re-described. The species is named for the Greek and Roman god of the Underworld.

Description The octopus is known from multiple specimens. The largest specimen, a male, spanned 540 mm (21 in) from arm tip to arm tip. Like other members of the genus Opisthoteuthis, this octopus is sexually dimorphic, the males having enlarged suckers on distinct regions of the arms. The species has 80–85 suckers per arm, with males having a region of proximal suckers enlarged (from the 4th to 9th or 10th sucker, near the mouth). The species is distinct in lacking any distally enlarged suckers on the male. Some sources note the species as having enlarged suckers on distal arm regions, but this was not noted in Berry's original description and seems to stem from confusion with the recently described Insigniteuthis obscura. The species has 8 lamellae on each gill, and unlike other southern Australian Opisthoteuthis has a unilobed digestive gland (liver), it has some unique modifications to its reproductive system that distinguishes it from other species. According to S. Stillman Berry, who described O. pluto, the octopus was capable of partially retracting its suckers and cirri (the small tendrils lining the arms). The octopus has a dark color, which helps it camouflage with the ocean floor.

Distribution Opisthoteuthis pluto was originally described from material collected in the central Great Australian Bight, off southern Australia, and some additional material has been collected off southeastern Australia. The species is benthic and occurs over a depth range of approximately 250–823 m.

References

External links Photograph of original specimen

Worked examples

Example 1 — a first encounter with Opisthoteuthis pluto

Start with the simplest possible case. Write down what Opisthoteuthis pluto 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 Opisthoteuthis pluto 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 Opisthoteuthis pluto 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 Opisthoteuthis pluto

In research: Opisthoteuthis pluto 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 Opisthoteuthis pluto 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: Opisthoteuthis pluto is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cephalopods of Australia, IUCN Red List data deficient species, Molluscs of the Indian Ocean, so understanding it makes those chapters shorter.
In everyday life: Look for Opisthoteuthis pluto 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 Opisthoteuthis pluto in 20 minutes

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

Frequently asked questions

What is Opisthoteuthis pluto in simple terms?

Opisthoteuthis pluto is a deep-sea cirrate octopus found off southern Australia in the bathyal zone. The species was described by S.

Why does Opisthoteuthis pluto 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 Opisthoteuthis pluto?

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 Opisthoteuthis pluto.