science

Nannochoristidae

Nannochoristidae 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 Nannochoristidae rather than just read about it. In short: Nannochoristidae is an unusual family of scorpionflies. It is a tiny, relict family with a single extant genus, Nannochorista, with eight species occurring in New Zealand, southeastern Australia, Tasmania, Argentina and Chile.

Key takeaways

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

Reference excerpt

Nannochoristidae is an unusual family of scorpionflies. It is a tiny, relict family with a single extant genus, Nannochorista, with eight species occurring in New Zealand, southeastern Australia, Tasmania, Argentina and Chile. Some studies have placed them as the closest living relatives of fleas. Most mecopteran larvae are eruciform, or shaped like caterpillars, however Nannochoristid larvae are elateriform, and have elongated and slender bodies. The larvae are aquatic, which is unique among mecopterans. The larvae are predatory, hunting on the beds of shallow streams, primarily on the larvae of aquatic Diptera like chironomids. The adults are thought probably to be adapted to liquid feeding, likely on flower nectar and/or the juice of fruits. Adults of Australian and South American species are often found in habitats like the edges of streams, lakes, as well as montane bogs. Australian species have been observed visiting the foliage and flowers of Leptospermum (tea trees). Due to the group's distinctiveness from other scorpionflies, it is sometimes placed in its own order, the Nannomecoptera. Fossils indicate that Nannochoristidae formerly had a wider distribution, being present in the Northern Hemisphere during the Jurassic and Early Cretaceous. Some research suggests the nannochoristids are the only holometabolous insects with true larval compound eyes. All other eyed larvae have stemmata, which are structurally different from adult compound eyes with ommatidia. This is unusual, since most adult features are present as imaginal discs in larvae and not formed until pupation. The presence of compound eyes in nannochoristid larvae suggests the timing of the development of adult features can be initiated earlier in development, which has important implications for insect evolutionary development.

Phylogeny The cladogram of external relationships, based on a 2008 DNA and protein analysis, shows the family as a clade, sister to the Siphonaptera (fleas) and rest of Mecoptera, and more distantly related to the Diptera (true flies) and Mecoptera (scorpionflies).

A more recent study in 2020 found Nannochoristidae to be the sister group to fleas, with strong support.

Genera After Cao et al. 2022.

Nannochorista Tillyard, 1917 (8 species: Argentina, Chile, Tasmania, Australia, New Zealand) Koonwarra fossil bed, Australia, Early Cretaceous (Aptian) †Dahurochorista Sukatsheva 1985 (one species: Ichetuy Formation, Russia, Late Jurassic (Oxfordian) †Dahurolarva Sukatsheva 1985 (one species: Ichetuy Formation, Oxfordian, Russia) (based on larvae only) †Itaphlebia Sukatsheva 1985 (14 species) Itat Formation, Russia, Middle Jurassic (Bathonian), Daohugou, China, Middle Jurassic (Callovian), Karabastau Formation, Kazakhstan, Late Jurassic (Oxfordian) Doronino Formation, Russia, Early Cretaceous (Barremian) †Namdyrus Sukacheva 1993 Khaya Formation, Russia, Late Jurassic (Tithonian) †Tarantogus Sukatsheva, 1985 Itat Formation, Russia, Bathonian (based on larvae only) †Undisca Sukatsheva, 1990 Glushkovo Formation, Russia, Tithonian

References

Illustrations

Worked examples

Example 1 — a first encounter with Nannochoristidae

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

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

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

Frequently asked questions

What is Nannochoristidae in simple terms?

Why does Nannochoristidae 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 Nannochoristidae?

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 Nannochoristidae.