biology

Poromitra crassiceps

Poromitra crassiceps 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 Poromitra crassiceps rather than just read about it. In short: Poromitra crassiceps, commonly called the crested bigscale (also called large-headed midnight fish, crested melamphid, or one-horned melamphaid) is a species of deep sea fish in the ridgehead family. While the fish with the common name crested bigscale in Alaskan waters had formerly been identified as P. crassiceps, it is now believed that Alaskan crested bigscales are actually Poromitra curilensis, and that P. cras…

Key takeaways

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

Reference excerpt

Poromitra crassiceps, commonly called the crested bigscale (also called large-headed midnight fish, crested melamphid, or one-horned melamphaid) is a species of deep sea fish in the ridgehead family. While the fish with the common name crested bigscale in Alaskan waters had formerly been identified as P. crassiceps, it is now believed that Alaskan crested bigscales are actually Poromitra curilensis, and that P. crassiceps is restricted to the Atlantic Ocean. As a result of this mis-identification, P. crassiceps is occasionally identified as the largest ridgehead - while specimens of P. curilensis as large as 18 cm SL have been found, the maximum length of P. crassiceps is 14.8 cm SL. Although almost no light penetrates to the deep sea from the surface, the crested bigscale has evolved features that make it practically invisible. Like other deep sea fish, it needs to avoid being seen by predators, some of which hunt for prey by creating their own light by means of bioluminescence. The crested bigscale achieves invisibility by having a skin that absorbs light with great efficiency. The pigment melanin is crammed into granules which are grouped into melanophores which cover virtually the whole of the dermis. This absorbs almost all of the incoming light, and any remaining light that scatters sideways is absorbed by neighbouring granules. The melanophores also cover the big scales, but these detach easily, and any predator that gets close enough, may end up with a mouthful of scales. Altogether, the absorption of light is 99.5% efficient, a fact that makes photographing this fish in its natural habitat very difficult.

References

External links Crested Bigscale at the Digital Fish Library - With some images of crested bigscales. Fishbase Article on Poromitra crassiceps - Much more information with references. Résultats des campagnes scientifiques - Prince Albert I of Monaco (french)

Illustrations

Worked examples

Example 1 — a first encounter with Poromitra crassiceps

Start with the simplest possible case. Write down what Poromitra crassiceps 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 Poromitra crassiceps 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 Poromitra crassiceps 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 Poromitra crassiceps

In research: Poromitra crassiceps 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 Poromitra crassiceps 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: Poromitra crassiceps is common in secondary-school and first-year university syllabi. It links to neighbouring topics Deep sea fish, Fish described in 1878, IUCN Red List least concern species, so understanding it makes those chapters shorter.
In everyday life: Look for Poromitra crassiceps 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 Poromitra crassiceps in 20 minutes

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

Frequently asked questions

What is Poromitra crassiceps in simple terms?

Why does Poromitra crassiceps 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 Poromitra crassiceps?

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 Poromitra crassiceps.