science

Planctomycetaceae

Planctomycetaceae 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 Planctomycetaceae rather than just read about it. In short: Planctomycetaceae is the only family in the order Planctomycetales within the Bacteria. Species within this family are mostly spherical, inhabiting a vast array of aquatic environments with the majority being in marine ecosystems.

Key takeaways

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

Reference excerpt

Planctomycetaceae is the only family in the order Planctomycetales within the Bacteria. Species within this family are mostly spherical, inhabiting a vast array of aquatic environments with the majority being in marine ecosystems. Planctomycetaceae species are generally aerobic, but are uniquely classified by fatty acid synthesis and stalk-like formations.

Morphology When compared to other species of the order Planctomycetales, species of the Planctomycetaceae family have very few unique characteristics that can taxonomically distinguish them from other related families. Planctomycetaceae species typically form colonies of a pink or white hue. Their cell structure has been recorded to be spherical, but many species are elliptical or pear-shaped; all species range from 0.4 micrometers to 2.5 micrometers in size. When reproducing, cell structures of Planctomycetaceae are usually observed to be in either a rosette or aggregate grouping; the species Thalassoglobus neptunius is the only known example in this family capable of growing in chains. Some members of Planctomycetaceae (including other taxonomic groups of Planctomycetota) develop stalk-like projections. The species Planctomyces bekefii is well-known in this family for its stalks, using them to connect newly produced cells.

Physiology Families in Planctomycetales that have more research conducted have been noted to undergo anaerobic respiration, with the family Brocadiaceae being well known for its anaerobic ammonium redox (anammox) capabilities. Planctomycetaceae is one of the many families of Planctomycetales that is both aerobic and cannot do anammox reactions. Similar to other families, members of Planctomycetaceae are capable of motility using flagella with some having cycles of motile and immotile lifestyles. Standing out from other bacteria, this group has been able to utilize its stalk-like structures to aid in biofilm production, providing a second source of adherence than usual extracellular polymeric substances. Fatty acids and lipids synthesized by Planctomycetaceae are similar in composition to other families of the order Planctomycetales, but are unique enough to be considered taxonomically critical. Phosphocholine, phosphatidylcholine, and phosphatidylglycerol are considered the major lipids of this family, which only some other families are capable of synthesizing. Most notably, fatty acid C18:1-ω9C is synthesized only within this family of Planctomycete bacteria.

Phylogeny The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI). As of 2022, researchers have discovered that there are currently 14 genera and 29 species within Planctomycetaceae.

Genera incertae sedis:

"Lacunimicrobium" Kabuu et al. 2025 Planctomyces Gimesi 1924 "Rhodopilula" Frank 2011 "Thermopirellula" Liu et al. 2012

See also List of bacteria genera List of bacterial orders

References

Illustrations

Worked examples

Example 1 — a first encounter with Planctomycetaceae

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

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

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

Frequently asked questions

What is Planctomycetaceae in simple terms?

Why does Planctomycetaceae 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 Planctomycetaceae?

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 Planctomycetaceae.