earth science

Gibbula magus

Gibbula magus is a earth 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 Gibbula magus rather than just read about it. In short: Gibbula magus, common name the great top shell, is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails. Description The size of the shell varies between 17 mm and 35 mm.

Key takeaways

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

Reference excerpt

Gibbula magus, common name the great top shell, is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.

Description The size of the shell varies between 17 mm and 35 mm. This is an abundant species. The solid, widely, deeply umbilicate shell has a low-conical shape. There is great variation in color. It is whitish or yellowish, painted with zigzag radiating stripes, maculations or lines of pink or rich brown, sometimes so broken into minute flecks as to appear minutely mottled all over, or sometimes lacking markings. The base of the shell is radiately zigzag-striped. The apex is acute. The conical spire contains 7 to 8 whorl. These are swollen, gibbous and radiately plicate beneath the sutures, and with a rim or flange at the periphery. The entire surface is spirally finely striate. The base is convex. The aperture is very oblique, rounded-rhomboid, and smooth within. The columella oblique, its edge straight or slightly convex in the middle, at its insertion reflexed slightly over the umbilicus. The umbilicus is bound by a strong spiral rib.

Distribution This species occurs in the North Sea, the North Atlantic Ocean (Azores, Morocco) and in the Mediterranean Sea.

References

Coen G. (1930). Gibbula (Forskaliopsis nov. sect.) Bellinii n. sp. nuovo gasteropodo marino di Capri. Annuario del Museo Zoologico della Reale Università di Napoli (n. ser.) 6(4): 2 Coen, G. (1937) Nuovo saggio di una sylloge molluscorum Adriaticorum. Memoria Reale Comitato Talassografico Italiano, 240, 1–173, 10 pls. Nordsieck, F. (1982) Die Europäischen Meeres-Gehäuseschnecken (Prosobranchia). Vom Eismeer bis Kapverden, Mittelmeer und Schwarzes Meer. 2., Völlig Neubearbeitete und Erweiterte Auflage. Gustav Fischer Verlag, Stuttgart, xii + 539 pp.

External links

"Gibbula magus". Gastropods.com. Retrieved 16 January 2019. Da Costa, Mendes E. (1778). Historia naturalis testaceorum Britanniæ, or, the British conchology; containing the descriptions and other particulars of natural history of the shells of Great Britain and Ireland: illustrated with figures. In English and French. - Historia naturalis testaceorum Britanniæ, ou, la conchologie Britannique; contenant les descriptions & autres particularités d'histoire naturelle des coquilles de la Grande Bretagne & de l'Irlande: avec figures en taille douce. En anglois & françois., i-xii, 1-254, i-vii, [1], Pl. I-XVII. London. (Millan, White, Emsley & Robson) Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata [10th revised edition], vol. 1: 824 pp. Laurentius Salvius: Holmiae Locard, A. (1886). Prodrome de malacologie française. Catalogue général des mollusques vivants de France. Mollusque marins. i>Lyon, H. Georg & Paris, Baillière pp. X + 778. Griffith E. & Pidgeon E. (1833-1834). The Mollusca and Radiata. Vol. 12, In: E. Griffith, [1824]−1835, The Animal Kingdom arranged in conformity with its organization, by the Baron Cuvier, [...]. London: Whittaker and Co., viii + 601 pp., 61 pls. [Date of publication after Evenhuis (2009): pp. 1–384, Mollusca pls. 1−39, Zoophytes pls 1-20 - 1833; pp. viii + 385-601, Mollusca corrected pls. 28*, 36*, 37*, pls. 40-41 - 1834]. , available online at http://www.biodiversitylibrary.org/item/40578 page(s): pl. 1, fig. 1 Bucquoy E., Dautzenberg P. & Dollfus G. (1882-1886). Les mollusques marins du Roussillon. Tome Ier. Gastropodes. Paris: Baillière & fils. 570 pp., 66 pls. [pp. 1-84, pls 1-10, 1882; pp. 85-196, pls 11-20, 1883; pp. 197-342, pls 21-40, 1884; pp. 343-418, pls 41-50, 1885; pp. 419-570, pls 51-66, http://www.biodiversitylibrary.org/item/55187 Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213

Illustrations

Worked examples

Example 1 — a first encounter with Gibbula magus

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

In research: Gibbula magus appears in earth 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 Gibbula magus 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: Gibbula magus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal taxa named by Carl Linnaeus, Gastropods described in 1758, Gibbula, so understanding it makes those chapters shorter.
In everyday life: Look for Gibbula magus 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 Gibbula magus in 20 minutes

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

Frequently asked questions

What is Gibbula magus in simple terms?

Gibbula magus, common name the great top shell, is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails. Description The size of the shell varies between 17 mm and 35 mm.

Why does Gibbula magus matter?

Because it connects several earth 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 Gibbula magus?

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 Gibbula magus.