biology

Hoilungidae

Hoilungidae 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 Hoilungidae rather than just read about it. In short: Hoilungidae is a placozoan family comprising Hoilungia and other currently undescribed taxa. Named in 2022, it is believed to be sister to Cladtertiidae, and corresponds to Clades IV, V and VII.

Key takeaways

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

Reference excerpt

Hoilungidae is a placozoan family comprising Hoilungia and other currently undescribed taxa. Named in 2022, it is believed to be sister to Cladtertiidae, and corresponds to Clades IV, V and VII. Previous studies established these clades on the basis of phylogenomic data. Genus Hoilungia encompasses members of Clade V, while Clades IV and VII have not been formally described as genera. The latter two are believed to encompass multiple species each, although the 2022 study establishing the structure of the family only mapped a single lineage of each. Previously, a wider definition of Hoilungia included all three clades, as well as clades III and VI. The latter two have since been assigned to Cladtertiidae and Cladhexea respectively.

Phylogeny The following phylogeny follows Eitel et al., 2024, and is based on complete mitochondrial genomes.

References

Works cited

Illustrations

Worked examples

Example 1 — a first encounter with Hoilungidae

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

In research: Hoilungidae 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 Hoilungidae 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: Hoilungidae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Monogeneric animal families, Placozoa, so understanding it makes those chapters shorter.
In everyday life: Look for Hoilungidae 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 “Hoilungidae” →

Affiliate

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

How to study Hoilungidae in 20 minutes

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

Frequently asked questions

What is Hoilungidae in simple terms?

Hoilungidae is a placozoan family comprising Hoilungia and other currently undescribed taxa. Named in 2022, it is believed to be sister to Cladtertiidae, and corresponds to Clades IV, V and VII.

Why does Hoilungidae 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 Hoilungidae?

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 Hoilungidae.