biology

Liguriella

Liguriella 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 Liguriella rather than just read about it. In short: Liguriella is a genus of glass squids, the genus is probably monotypic, the only species being Liguriella podophthalma. The other named species Liguriella pardus, which was described by S.

Key takeaways

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

Reference excerpt

Liguriella is a genus of glass squids, the genus is probably monotypic, the only species being Liguriella podophthalma. The other named species Liguriella pardus, which was described by S. Stillman Berry in 1916, is cited as a taxon inquirendum but it is suggested that there may be in fact more than one species and there are species yet to be described.

Description Liguriella podophthalma is a moderate sized squid, attaining a mantle length of at least 243mm. The tentacles have a tentacular club which only have suckers, there is no carpal cluster and the stalks have two rows of suckers and knobs. The funnel has no valve and the funnel organ has a dorsal pad which has three papillae. There are tubercles at the join of the funnel and the mantle. The fins are inserted posterior at the distal end of the gladius and only the anterior edge of the fins is not so inserted into the gladius. The eye contains two photophores which run together and there are no photophores on the arms. The contiguous photophores on the eyes are unusual within the Cranchiidae and are only shared with Sandalops.

Distribution Liguriella podophthalma occurs around the world where it can be found in the tropical, subtropical and northern sub-Antarctic waters of the oceans.

Habitat and ecology The overall vertical distribution of Liguriella podophthalma extends from just below the surface to depths of over 1000m to 1500m. The paralarvae and juveniles of less than 40mm mantle length occur in the upper water column to 400m. As they mature they migrate to progressively greater depths, an ontogenetic descent, and this reaches to about 1500 m, the depth at which the largest individual collected to date was recorded, it had a mantle length of 243mm and was a subadult.

References

External links CephBase: Liguriella Tree of Life web project: Liguriella

Worked examples

Example 1 — a first encounter with Liguriella

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

In research: Liguriella 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 Liguriella 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: Liguriella is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bioluminescent molluscs, Cephalopod genera, Cephalopods described in 1908, so understanding it makes those chapters shorter.
In everyday life: Look for Liguriella 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 Liguriella in 20 minutes

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

Frequently asked questions

What is Liguriella in simple terms?

Liguriella is a genus of glass squids, the genus is probably monotypic, the only species being Liguriella podophthalma. The other named species Liguriella pardus, which was described by S.

Why does Liguriella 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 Liguriella?

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 Liguriella.