biology

Staurocalyptus

Staurocalyptus 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 Staurocalyptus rather than just read about it. In short: Staurocalyptus is a genus of sponge. It was circumscribed in 1897 by Isao Ijima.

Key takeaways

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

Reference excerpt

Staurocalyptus is a genus of sponge. It was circumscribed in 1897 by Isao Ijima.

Taxonomy

Ijima circumscribed Staurocalyptus as a genus in the family Rossellidae. His initial taxonomy included three newly described species and two transferred from Rhabdocalyptus. Ijimi did not designate a type species; in 1967 V. M. Koltun designated Rhabdocalyptus dowlingi Lambe, 1893 as the type species. A 2002 revision of Rossellidae by K. R. Tabachnick demoted Staurocalyptus to be a subgenus of Acanthascus and designated a new type species: Staurocalyptus glaber Ijima, 1897. However, as of 2017, WoRMS still classifies Staurocalyptus as a genus and follows Koltun's type species designation, not that of Tabachnick.

Distribution Its species are found in the Pacific Ocean, at a depth of 30–1,700 metres (98–5,577 ft).

Species As of 2017, WoRMS recognizes the following seventeen species:

Staurocalyptus affinis Ijima, 1904 Staurocalyptus celebesianus IIjima, 1927 Staurocalyptus dowlingi (Lambe, 1893) Ijima, 1897 Staurocalyptus entacanthus Ijima, 1904 Staurocalyptus fasciculatus Schulze, 1899 Staurocalyptus fuca Tabachnick, 1989 Staurocalyptus glaber Ijima, 1897 Staurocalyptus hamatus Lendenfeld, 1915 Staurocalyptus heteractinus Ijima, 1897 Staurocalyptus microchetus Ijima, 1898 Staurocalyptus pleorhaphides Ijima, 1897 Staurocalyptus psilosus Reiswig & Stone, 2013 Staurocalyptus roeperi (Schulze, 1886) Ijima, 1897 Staurocalyptus rugocruciatus Okada, 1932 Staurocalyptus solidus Schulze, 1899 Staurocalyptus tubulosus Ijima, 1904 Staurocalyptus tylotus Reiswig & Stone, 2013

References

Illustrations

Worked examples

Example 1 — a first encounter with Staurocalyptus

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

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

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

Frequently asked questions

What is Staurocalyptus in simple terms?

Staurocalyptus is a genus of sponge. It was circumscribed in 1897 by Isao Ijima.

Why does Staurocalyptus 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 Staurocalyptus?

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 Staurocalyptus.