science

Opalozoa

Opalozoa 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 Opalozoa rather than just read about it. In short: Opalozoa is a subphylum of heterotrophic protists of the phylum Bigyra, and is the sister group to Sagenista. Opalozoans are non-photosynthetic heterokonts that are ancestrally phagotrophic but many times have evolved to be osmotrophic saprotrophs in the gut of vertebrate animals.

Key takeaways

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

Reference excerpt

Opalozoa is a subphylum of heterotrophic protists of the phylum Bigyra, and is the sister group to Sagenista. Opalozoans are non-photosynthetic heterokonts that are ancestrally phagotrophic but many times have evolved to be osmotrophic saprotrophs in the gut of vertebrate animals.

Taxonomy

History: phylum Opalozoa In 1993 the name “Opalozoa” referred to a group of protists that was very different from what it is now. It was a phylum composed of many unrelated zooflagellates, grouped together because of the common presence of tubular mitochondrial cristae and the lack of cortical alveoli or rigid tubular ciliary hairs (retronemes). It also included the opalinids, proteomyxids and plasmodiophorids.

Modern classification The modern taxonomy of Opalozoa, down to order level, is as follows:

Subphylum Opalozoa Cavalier-Smith, 1991 stat. nov. 2006 emend. 2018 Infraphylum Bikosia Cavalier-Smith, 2013 Class Bikosea Cavalier-Smith nom. n. pro Bicosoecea Cavalier-Smith, 1986 Subclass Bicosidia Cavalier-Smith, 2006 orth. emend. Superorder Cyathobodoniae Cavalier-Smith, 1993 emend. stat. nov. 2006 Order Bicoecida Grassé, 1926 Order Anoecida Cavalier-Smith, 1997 emend. 2006 Order Pseudodendromonadida Hibberd, 1985 emend. Cavalier-Smith, 2006 Superorder Borokiae Cavalier-Smith, 2006 Order Borokida Cavalier-Smith, 2006 Subclass Rictidia Cavalier-Smith, 2013 Order Rictida Cavalier-Smith, 2013 Infraphylum Placidozoa Cavalier-Smith, 2013 Superclass Wobblata Cavalier-Smith, 2006 stat. nov. 2013 [paraphyletic] Class Placididea Moriya, Nakayama & Inouye, 2002 Order Placidida Moriya, Nakayama & Inouye, 2002 [=Placidae Cavalier-Smith, 2006] Class Nanomonadea Cavalier-Smith, 2013 Order Uniciliatida Cavalier-Smith, 2013 Class Opalomonadea Cavalier-Smith, 2013 Superclass Opalinata Wenyon, 1926 emend. Cavalier-Smith, 1996 stat. nov. 2006 Class Opalinea Wenyon, 1926 stat. nov. Cavalier-Smith, 1993 emend. 2013 Order Proteromonadida Grassé, 1952 emend. Cavalier-Smith, 1993 Order Opalinida Poche, 1913 stat. nov. Hall, 1953 emend. Cavalier-Smith Class Blastocystea Zierdt et al., 1967 Order Blastocystida Zierdt, 1978 Opalozoa incertae sedis: Pendulomonas Tong, 1977 Bordnamonadidae Cavalier-Smith, 2013

Phylogeny The cladogram below shows the internal relationships of Opalozoa.

References

Illustrations

Worked examples

Example 1 — a first encounter with Opalozoa

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

In research: Opalozoa 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 Opalozoa 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: Opalozoa is common in secondary-school and first-year university syllabi. It links to neighbouring topics Stramenopile taxa, so understanding it makes those chapters shorter.
In everyday life: Look for Opalozoa 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Opalozoa” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Opalozoa in 20 minutes

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

Frequently asked questions

What is Opalozoa in simple terms?

Why does Opalozoa 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 Opalozoa?

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 Opalozoa.