biology

Neopilina

Neopilina 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 Neopilina rather than just read about it. In short: Neopilina is a highly derived genus of modern monoplacophoran. Species Four species are recognized: Neopilina bruuni Menzies, 1968 Neopilina galatheae Lemche, 1957 Neopilina rebainsi Moskalev, Starobogatov & Filatova, 1983 Neopilina starobogatovi Ivanov & Moskalev, 2007 Phylogeny Some molecular results show that they fall within the polyplacophoran clade, although these results have been called into question.

Key takeaways

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

Reference excerpt

Neopilina is a highly derived genus of modern monoplacophoran.

Species Four species are recognized:

Neopilina bruuni Menzies, 1968 Neopilina galatheae Lemche, 1957 Neopilina rebainsi Moskalev, Starobogatov & Filatova, 1983 Neopilina starobogatovi Ivanov & Moskalev, 2007

Phylogeny Some molecular results show that they fall within the polyplacophoran clade, although these results have been called into question. Fossil and morphological data show that they are rather derived and bear very little resemblance to an 'ancestral mollusc'.

Anatomy Its anatomy led researchers to believe that the cephalopods evolved from the Monoplacophora. Its pair of preoral tentacles are considered homologous to those of gastropods; like prosobranch gastropod tentacles, their nerves connect to the cerebral ganglia. The post-oral tentacles are equated with bivalves' labial flaps, cephalopods' arms, and scaphopods' captacula. Cuticular hardenings around the mouth of the organism are considered to be jaw-like and not far removed from the beaks of cephalopods or the jaws of many gastropods. The presence of a single shell prompts comparisons to the cephalopod Nautilus, but besides its bilateral symmetry and direction of coiling, there is not a clear equivalence; Nautilus' shell is notably different in the possession of septa (and thus a siphuncle). It bears a similar degree of similarity to most other mollusc groups, leading to speculation that it may reflect a relatively unchanged ancestral mollusc. The shell itself is aragonitic, consisting mainly of a prismatic layer, lined with nacre. The organism bears five pairs of ctenidia (gills), unusually for molluscs; the rear two are homologous to the two pairs in Nautilus. This is unlike the Polyplacophora (chitons), which have a number of pairs of ctenidia, but this number varies and is not related to the number of their body 'segments'. The foot and pallial groove are very difficult indeed to discriminate from the polyplacophora, supporting its placement in this group by molecular methods Its radula is not unlike that of the polyplacophora; notably, its fifth tooth is modified to be comb-like.

Ecology

Neopilina is a bottom feeder, probably a deposit feeder; whilst alive, its shell is covered by a layer of mucus that might be involved in feeding or locomotion. In 2017, a deep-sea expedition by the Okeanos Explorer off the coast of American Samoa filmed the first-ever high-resolution video of a monoplacophoran in its natural habitat. Two Neopilina sp. individuals were filmed on the ocean floor. The individuals may belong to an undescribed species, with five pairs of long gills clearly visible.

References

External links Video of Neopilina sp. Footage taken by ROV Deep Discoverer, NOAA 2017 American Samoa Expedition (EX-17-02), dive 08 at ‘Utu’ seamount, 3837 m depth.

Illustrations

Worked examples

Example 1 — a first encounter with Neopilina

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

In research: Neopilina 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 Neopilina 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: Neopilina is common in secondary-school and first-year university syllabi. It links to neighbouring topics Mollusc genera, Monoplacophora, so understanding it makes those chapters shorter.
In everyday life: Look for Neopilina 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 Neopilina in 20 minutes

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

Frequently asked questions

What is Neopilina in simple terms?

Neopilina is a highly derived genus of modern monoplacophoran. Species Four species are recognized: Neopilina bruuni Menzies, 1968 Neopilina galatheae Lemche, 1957 Neopilina rebainsi Moskalev, Starobogatov & Filatova, 1983 Neopilina starobogatovi Ivanov & Moskalev, 2007 Phylogeny Some molecular res…

Why does Neopilina 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 Neopilina?

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 Neopilina.