science

Priscagrionidae

Priscagrionidae 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 Priscagrionidae rather than just read about it. In short: Priscagrionidae is a family of damselflies found in southern China and northern Vietnam. It is the only family in the superfamily Priscagrionoidea.

Key takeaways

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

Reference excerpt

Priscagrionidae is a family of damselflies found in southern China and northern Vietnam. It is the only family in the superfamily Priscagrionoidea. The family contains two genera, Priscagrion and Sinocnemis, and five recognised species. Members of the family are medium-sized to large damselflies associated with forest streams. They have long legs, slender bodies and clear wings, although males of Priscagrion possess a distinctive dark patch near the wing tips. Adults typically perch with their wings held outstretched and have black bodies marked with blue patterning, especially towards the end of the abdomen in males. Priscagrionidae was established in 2021 after molecular phylogenetic studies showed that Priscagrion and Sinocnemis form a distinct lineage separate from the families in which they had previously been placed.

Genera The following genera are currently placed in Priscagrionidae:

Priscagrion Zhou & Wilson, 2001 Sinocnemis Wilson & Zhou, 2000

Taxonomic history Sinocnemis was described in 2000 for two unusual damselflies from south-western China that did not fit comfortably within any previously recognised genus. The authors noted a number of distinctive features and regarded it as an ancient lineage within Platycnemididae. The following year the same authors, Wen-Bao Zhou and Peter Wilson, described Priscagrion from southern China. They also considered it to be an archaic genus and placed it in Megapodagrionidae, noting similarities to several other primitive damselfly groups. Although the two genera were initially assigned to different families, subsequent molecular studies showed that they form a distinct evolutionary lineage. In 2021, Seth Bybee and colleagues placed Priscagrion and Sinocnemis in the new family Priscagrionidae.. In 2026, Payton Carter and colleagues recognised the family as the sole member of the new superfamily Priscagrionoidea, based on phylogenomic analyses that resolved it as a distinct lineage among damselflies.

Phylogeny

Relationship of Priscagrionoidea among living damselfly superfamilies, based on Carter et al. (2026).

Etymology The superfamily name Priscagrionoidea is derived from the type genus Priscagrion, with the zoological suffix -oidea for superfamilies. The family name Priscagrionidae is derived from the type genus Priscagrion, with the standard zoological suffix -idae used for animal families. The genus name Priscagrion is derived from the Latin priscus ("ancient", "primitive" or "old") and Agrion, a historical name widely used for damselflies. Zhou and Wilson selected the name to reflect what they considered the archaic characteristics of the genus, including its wing venation and other morphological features.

References

Worked examples

Example 1 — a first encounter with Priscagrionidae

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

In research: Priscagrionidae 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 Priscagrionidae 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: Priscagrionidae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Insects described in 2021, Odonata families, Priscagrionidae, so understanding it makes those chapters shorter.
In everyday life: Look for Priscagrionidae 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 Priscagrionidae in 20 minutes

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

Frequently asked questions

What is Priscagrionidae in simple terms?

Priscagrionidae is a family of damselflies found in southern China and northern Vietnam. It is the only family in the superfamily Priscagrionoidea.

Why does Priscagrionidae 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 Priscagrionidae?

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 Priscagrionidae.