science

Turris selwyni

Turris selwyni is a science 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 Turris selwyni rather than just read about it. In short: Turris selwyni is an extinct species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids. Description The length of the shell varies between 28 mm and 38 mm.

Key takeaways

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

Reference excerpt

Turris selwyni is an extinct species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.

Description The length of the shell varies between 28 mm and 38 mm. (Original description) The shell has a tumidly fusiform or biconic shape. It is of medium size and build, with a comparatively broad body whorl rapidly tapering to a very acute spire, with an aperture only slightly less than half the length of the shell, and a well-marked sinus on the keel. The protoconch is small, smooth, with an obtuse nucleus composed of about two whorls gradually merging into the whorls of the spire. The spire contains eight whorls, with a somewhat irregular and ascending overlap, giving rise to a canaliculate suture. The whorls are convex and furnished medially with two spiral lirae which mark exactly the position of the sinus. A third spiral thread is usually visible just above the anterior suture, and a fourth weak one just below the posterior suture on the earlier spire whorls, while a fifth makes its appearance on the penultimate and antepenultimate whorls and the posterior sutural thread becomes stronger. On the body whorl below the sinus threads there are eight or nine stronger spiral lirae, and the space between the suture and the keel is strongly concave. The whole shell surface is finely spirally striate, the striae tending to be slightly undulatory owing to irregularities of growth, and increasing in strength towards the anterior of the shell. The spiral sculpture is crossed transversely by sinuated growth lines and striae of unequal strength. The sinus is broad and deep, and distinctly margined by the lirae forming the keel. The aperture is large, pyriform, and extending- to a short, broad, open, slightly bent siphonal canal. The outer lip is thin and strongly arched at the middle, crenulate internally in conformity with the stronger spiral threads. The columella margin is smooth and slightly enamelled.

Distribution Fossils of this marine species were found in Miocene strata in Victoria, Australia.

References

Finlay, H. J. (1927). New specific names for Austral Mollusca. Transactions of the New Zealand Institute. 57: 488–533.

External links A.W.B. Powell, The family Turridae in the Indo-Pacific. Part 1. The subfamily Turrinae

Illustrations

Worked examples

Example 1 — a first encounter with Turris selwyni

Start with the simplest possible case. Write down what Turris selwyni claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Turris selwyni 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 Turris selwyni 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 Turris selwyni

In research: Turris selwyni appears in science 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 Turris selwyni 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: Turris selwyni is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinct gastropods, Gastropods described in 1904, Turris, so understanding it makes those chapters shorter.
In everyday life: Look for Turris selwyni 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 “Turris selwyni” →

Affiliate

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

How to study Turris selwyni in 20 minutes

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

Frequently asked questions

What is Turris selwyni in simple terms?

Turris selwyni is an extinct species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids. Description The length of the shell varies between 28 mm and 38 mm.

Why does Turris selwyni matter?

Because it connects several science 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 Turris selwyni?

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 Turris selwyni.