biology

Stauroteuthis gilchristi

Stauroteuthis gilchristi 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 Stauroteuthis gilchristi rather than just read about it. In short: Stauroteuthis gilchristi is a species of small pelagic octopus found at great depths in the south Atlantic Ocean. It is believed to be one of a very small number of octopuses to exhibit bioluminescence, like its sister taxon Stauroteuthis syrtensis.

Key takeaways

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

Reference excerpt

Stauroteuthis gilchristi is a species of small pelagic octopus found at great depths in the south Atlantic Ocean. It is believed to be one of a very small number of octopuses to exhibit bioluminescence, like its sister taxon Stauroteuthis syrtensis.

Description Stauroteuthis gilchristi has a secondary web, a small mantle aperture and a vestigial, U-shaped shell supporting the fins. The arms are fringed with long cirri but these do not extend as far as the tip. There is no radula. It can be distinguished from the otherwise similar Stauroteuthis syrtensis by the larger suckers. Only a few specimens have been examined, and from these it seems that there is no sexual dimorphism. However, this may not be the case, as most specimens so far collected have been either males or immature females.

Distribution Stauroteuthis gilchristi is found in deep waters in the southern Atlantic Ocean. The type specimen was taken from near South Africa and is the only specimen recovered from that locality. A small number of individuals have since been recovered from near South Georgia. There is a certain difference between these and the holotype in that the cirri start further up the arm in the South Georgia specimens, and it is possible that there are in fact two different species, one on each side of the Atlantic. More recently, evidence has been found of the presence of this species in the southern Indian Ocean, and off Macquarie Island (south of Australia), and it may therefore have a circum-polar distribution throughout the Southern Ocean.

Ecology In a study, the stomach contents of a top predator in sub-antarctic waters, the Patagonian toothfish (Dissostichus eleginoides), were examined in order to see what octopuses and squid formed part of the diet. These could be identified by the undigested remains of their beaks. In waters around the Crozet Islands, 53 beaks of S. gilchristi were found among a total of 1725 cephalopod beaks, and this cirrate octopus formed 3% of the diet of the toothfish. This study extended the range of S. gilchristi into the southern Indian Ocean.

References

Worked examples

Example 1 — a first encounter with Stauroteuthis gilchristi

Start with the simplest possible case. Write down what Stauroteuthis gilchristi 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 Stauroteuthis gilchristi 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 Stauroteuthis gilchristi 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 Stauroteuthis gilchristi

In research: Stauroteuthis gilchristi 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 Stauroteuthis gilchristi 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: Stauroteuthis gilchristi is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bioluminescent molluscs, Cephalopods described in 1924, IUCN Red List data deficient species, so understanding it makes those chapters shorter.
In everyday life: Look for Stauroteuthis gilchristi 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 “Stauroteuthis gilchristi” →

Affiliate

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

How to study Stauroteuthis gilchristi in 20 minutes

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

Frequently asked questions

What is Stauroteuthis gilchristi in simple terms?

Why does Stauroteuthis gilchristi 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 Stauroteuthis gilchristi?

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 Stauroteuthis gilchristi.