biology

Neoplanorbis tantillus

Neoplanorbis tantillus 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 Neoplanorbis tantillus rather than just read about it. In short: Neoplanorbis tantillus was a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to the United States.

Key takeaways

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

Reference excerpt

Neoplanorbis tantillus was a species of very small air-breathing freshwater snail, an aquatic gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to the United States. In 2012, it was declared extinct by the IUCN Red List of Threatened Species. The shell of this species appeared to be dextral in coiling, but as is the case in all planorbids, the shell was actually sinistral. The shell was carried upside down with the aperture on the right, and this made it appear to be dextral.

Original description Species Neoplanorbis tantillus was originally described by Henry Augustus Pilsbry in 1906. Type locality is Coosa River near or in Wetumpka, Alabama. Pilsbry's original text (the type description) reads as follows:

Neoplanorbis tantillus n. sp. PI. III, figs. 3, 4, 5. Shell very narrowly perforate, slightly convex above, very convex below, with a strongly projecting rounded keel at the periphery; light brown; surface slightly shining, sculptured with very obliquely radial growth-lines and raised spiral stride, rather coarse for a shell of this size. Whorls 2, rapidly enlarging, the apex somewhat sunken; first whorl very convex, the second much less so, slowly descending in front. Aperture very oblique, shaped like a gothic-arched door, the upper and lower margins arcuate, the outer margin angular, the columellar margin dilated, straight and vertical, with a rather wide whitish callus within. Alt. .8, diam. 1.7 mm.

The specimens occurred at Wetumpka, Alabama with the preceding species. This is one of the smallest fresh-water mollusks yet found in America. Note: "preceding species" in the description means Amphigyra alabamensis, because these two species were newly described in the same work.

References

Illustrations

Worked examples

Example 1 — a first encounter with Neoplanorbis tantillus

Start with the simplest possible case. Write down what Neoplanorbis tantillus 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 Neoplanorbis tantillus 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 Neoplanorbis tantillus 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 Neoplanorbis tantillus

In research: Neoplanorbis tantillus 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 Neoplanorbis tantillus 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: Neoplanorbis tantillus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gastropods described in 1906, IUCN Red List extinct species, Molluscs of the United States, so understanding it makes those chapters shorter.
In everyday life: Look for Neoplanorbis tantillus 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 Neoplanorbis tantillus in 20 minutes

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

Frequently asked questions

What is Neoplanorbis tantillus in simple terms?

Why does Neoplanorbis tantillus 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 Neoplanorbis tantillus?

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 Neoplanorbis tantillus.