chemistry

Opalinata

Opalinata is a chemistry 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 Opalinata rather than just read about it. In short: Opalinata is a superclass of non-phagotrophic heterokonts that unites the classes Opalinea and Blastocystea, and is the sister group to Opalomonadea. Description When Opalinata was first erected as a taxon in 1926, it was placed as the sole class in the group "Protociliata" and considered as primitive ciliates due to the fact that they move thanks to their numerous cilia and that they both present two nuclei.

Key takeaways

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

Reference excerpt

Opalinata is a superclass of non-phagotrophic heterokonts that unites the classes Opalinea and Blastocystea, and is the sister group to Opalomonadea.

Description When Opalinata was first erected as a taxon in 1926, it was placed as the sole class in the group "Protociliata" and considered as primitive ciliates due to the fact that they move thanks to their numerous cilia and that they both present two nuclei. They were distinguished because they perform syngamy by the complete fusion of uninucleated gametes, while the rest of the ciliates, forming "Euciliata" (Ciliata + Suctoria), perform syngamy through their micronuclei alone while their macronuclei dissolve. The taxon Opalinata was revised in 1996 by Cavalier-Smith and placed in Opalozoa, and is now defined by the following synapomorphies: gut parasitism and the loss of peroxisomes and phagocytosis.

Phylogeny The cladogram below shows the relationships between Opalinata and the rest of Opalozoa.

Classification The modern taxonomy of Opalinata is as follows:

Phylum Bigyra Subphylum Opalozoa Cavalier-Smith, 1991 stat. n. 2006 em. Infraphylum Placidozoa Cavalier-Smith 2013 Superclass Opalinata Wenyon, 1926 em. Cavalier-Smith, 1996 stat. n. 2006 Class Opalinea Wenyon, 1926 stat. n. Cavalier-Smith, 1993 em. 2013 Order Proteromonadida Grassé, 1952 em. Cavalier-Smith, 1993 Family Proteromonadidae Grassé, 1952 (Proteromonas) Order Opalinida Poche, 1913 stat. n. Hall, 1953 em. Cavalier-Smith Family Karotomorphidae Travis, 1934 (Karotomorpha) Family Opalinidae Claus, 1874 (e.g. Cepedea, Protoopalina, Opalina) Class Blastocystea Zierdt et al., 1967 Order Blastocystida Zierdt, 1978 Family Blastocystidae Jiang and He, 1988 (type genus Blastocystis Aléxéieff, 1911)

References

Illustrations

Worked examples

Example 1 — a first encounter with Opalinata

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

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

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

Frequently asked questions

What is Opalinata in simple terms?

Opalinata is a superclass of non-phagotrophic heterokonts that unites the classes Opalinea and Blastocystea, and is the sister group to Opalomonadea. Description When Opalinata was first erected as a taxon in 1926, it was placed as the sole class in the group "Protociliata" and considered as primit…

Why does Opalinata matter?

Because it connects several chemistry 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 Opalinata?

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 Opalinata.