biology

Psolus chitonoides

Psolus chitonoides 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 Psolus chitonoides rather than just read about it. In short: Psolus chitonoides, also known as the slipper sea cucumber, armoured sea cucumber, creeping armoured sea cucumber, or creeping pedal sea cucumber, is a species of sea cucumber in the family Psolidae. It is found in shallow water on the western coast of North America.

Key takeaways

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

Reference excerpt

Psolus chitonoides, also known as the slipper sea cucumber, armoured sea cucumber, creeping armoured sea cucumber, or creeping pedal sea cucumber, is a species of sea cucumber in the family Psolidae. It is found in shallow water on the western coast of North America. The scientific name "chitonoides" means resembling a chiton.

Description The slipper sea cucumber has an oval body some 7 cm (3 in) long and 5.8 cm (2.3 in) wide. The upper surface is domed and the under surface or sole is well-equipped with tube feet. A staggered row of large tube feet run along the centre of the sole, one or two rows of stout tube feet run on either side of this near the edge, and a single row of smaller feet set in pits run along the edges of the sole. The mouth, surrounded by a ring of tentacles is at one end of the animal. The tentacles are repeatedly branched and number eight to ten, either all the same size or with two smaller than the rest. The anus is on the dorsal surface on the opposite end to the mouth. The skin is leathery, somewhat spiny, and protected by rows of stiff, overlapping scales. The scales are yellow to bright orange and the tentacles are red with white tips.

Discovery Psolus chitonoides was discovered in 1886, in Puget Sound by Columbia University teams.

Distribution and habitat The slipper sea cucumber is found on the western coast of North America, its range extending from the Aleutian Islands to Baja California. It occurs on both exposed coasts and in quiet inlets, in the sublittoral zone down to depths of about 247 m (800 ft). Its soft, pliable sole means that it can stick to rocks and it is commonly found clinging firmly to vertical rock faces.

Ecology The slipper sea cucumber is a suspension feeder, intercepting particles floating past which are then trapped by sticky papillae on its feeding tentacles. It has a high concentration of saponins in its tissues. This makes it toxic and it is avoided by most predatory fish, gastropod molluscs and crabs; its flesh has been shown to be unpalatable to the tidepool sculpin (Oligocottus maculosus). Its main predators are starfish, especially the leather star (Dermasterias imbricata). The juveniles of the species are photo negative. The eggs are a bright red in color.

References

Worked examples

Example 1 — a first encounter with Psolus chitonoides

Start with the simplest possible case. Write down what Psolus chitonoides 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 Psolus chitonoides 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 Psolus chitonoides 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 Psolus chitonoides

In research: Psolus chitonoides 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 Psolus chitonoides 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: Psolus chitonoides is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animals described in 1901, Dendrochirotida, NatureServe secure species, so understanding it makes those chapters shorter.
In everyday life: Look for Psolus chitonoides 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 Psolus chitonoides in 20 minutes

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

Frequently asked questions

What is Psolus chitonoides in simple terms?

Why does Psolus chitonoides 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 Psolus chitonoides?

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 Psolus chitonoides.