science

Rossellidae

Rossellidae is a science 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 Rossellidae rather than just read about it. In short: Rossellidae is a family of glass sponges belonging to the order Lyssacinosa. The family has a cosmopolitan distribution and is found at a large range of depths (8–6,770 m (26–22,211 ft), and likely deeper).

Key takeaways

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

Reference excerpt

Rossellidae is a family of glass sponges belonging to the order Lyssacinosa. The family has a cosmopolitan distribution and is found at a large range of depths (8–6,770 m (26–22,211 ft), and likely deeper).

Description The body is usually a cup-like structure. In stalked forms the body can be mushroom-like. Spicules protruding beyond the sponge surface, when present, are diactines (spicules with two pointed arms) or specialised outwardly protruding hypodermal pentactines (five pointed spicules). The choanosomal skeleton consists of diactines, sometimes together with less frequent hexactines (spicules with six prongs). A large variety of microscleres occur in this family, including a variety of holactinoidal and asterous spicules.

Subfamilies and genera As of 2017, WoRMS recognizes three subfamilies and twenty-six genera in the family:

Subfamily Acanthascinae Schulze, 1897 Acanthascus Schulze, 1886 Rhabdocalyptus Schulze, 1886 Staurocalyptus Ijima, 1897 Subfamily Lanuginellinae Gray, 1872 Calycosoma Schulze, 1899 Caulophacus Schulze, 1886 Doconesthes Topsent, 1928 Lanuginella Schmidt, 1870 Lanugonychia Lendenfeld, 1915 Lophocalyx Schulze, 1887 Mellonympha Schulze, 1897 Sympagella Schmidt, 1870 Subfamily Rossellinae Schulze, 1885 Anoxycalyx Kirkpatrick, 1907 Aphorme Schulze, 1899 Asconema Kent, 1870 Aulosaccus Ijima, 1896 Bathydorus Schulze, 1886 Crateromorpha Gray in Carter, 1872 Hyalascus Ijima, 1896 Nodastrella Dohrmann, Göcke, Reed & Janussen, 2012 Rossella Carter, 1872 Schaudinnia Schulze, 1900 Scyphidium Schulze, 1900 Symplectella Dendy, 1924 Trichasterina Schulze, 1900 Vazella Gray, 1870 Vitrollula Ijima, 1898

References

Further reading Dohrmann, M. ; C. Göcke ; J. Reed & D. Janussen, 2012: Integrative taxonomy justifies a new genus, Nodastrella gen. nov., for North Atlantic "Rossella" species (Porifera: Hexactinellida: Rossellidae). Zootaxa 3383: 1–13. Sautya, S.; Tabachnick, K.R.; Ingole, B. 2010: First record of Hyalascus (Hexactinellida: Rossellidae) from the Indian Ocean, with description of a new species from a volcanic seamount in the Andaman Sea. Zootaxa, 2667: 64-68

External links Data related to Rossellidae at Wikispecies Media related to Rossellidae at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Rossellidae

Start with the simplest possible case. Write down what Rossellidae claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Rossellidae 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 Rossellidae 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 Rossellidae

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

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

Frequently asked questions

What is Rossellidae in simple terms?

Why does Rossellidae matter?

Because it connects several science 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 Rossellidae?

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 Rossellidae.