science

Haidomyrmecinae

Haidomyrmecinae 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 Haidomyrmecinae rather than just read about it. In short: Haidomyrmecinae, occasionally called hell ants, are an extinct subfamily of ants (Formicidae) known from Cretaceous fossils primarily found in amber from North America, South America, Europe, and Asia, spanning the late Aptian to Campanian, around 113 to 79 million years ago. The subfamily was first proposed in 2003 but had been subsequently treated as the tribe Haidomyrmecini and placed in the extinct ant subfamily…

Key takeaways

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

Reference excerpt

Haidomyrmecinae, occasionally called hell ants, are an extinct subfamily of ants (Formicidae) known from Cretaceous fossils primarily found in amber from North America, South America, Europe, and Asia, spanning the late Aptian to Campanian, around 113 to 79 million years ago. The subfamily was first proposed in 2003 but had been subsequently treated as the tribe Haidomyrmecini and placed in the extinct ant subfamily Sphecomyrminae. Reevaluation of the Haidomyrmecini in 2020 led to the elevation of the group back to the subfamily. The family contains nine genera and 13 species. Members of this family are highly distinct from all other ants, having diverse head ornamentation, and unusually shaped, extended mandibles that are articulated vertically rather than horizontally as in modern ants. The jaws in combination with the head ornamentation served to restrain prey, with most species having setae (hair-like structures) covering parts of the head, which likely functioned as triggers to rapidly close the jaw when disturbed, similar to those of modern trap-jaw ants. Fossils indicate that haidomyrmecines were able to take prey solitarily. Like modern ants, they were eusocial, with distinct worker and queen castes, likely with relatively small colony sizes. Due to their lack of metabolic stores, the queens likely engaged in hunting during the initial foundation of the nest. Haidomyrmecines are thought to be amongst the most basal and earliest diverging group of ants known.

Genera

Including the type genus Haidomyrmex, the subfamily contains 10 genera and 14 species. The vast majority of species are known from Burmese amber, which dates to the mid-Cretaceous, around 100 million years ago. Other species are known from French amber of equivalent age, as well as the Canadian amber of Alberta, Canada, which dates to around 80 million years ago. Only a single limestone fossil of a hell ant has been known so far. It is from the Crato Formation of Brazil, from around 113 million years ago, and is considered the oldest ant fossil ever found.

References

External links The Reign of the Hell Ants PBS Eons, Jan 21, 2021

Illustrations

Worked examples

Example 1 — a first encounter with Haidomyrmecinae

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

In research: Haidomyrmecinae 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 Haidomyrmecinae 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: Haidomyrmecinae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ant stubs, Ant subfamilies, Cretaceous insects, so understanding it makes those chapters shorter.
In everyday life: Look for Haidomyrmecinae 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 Haidomyrmecinae in 20 minutes

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

Frequently asked questions

What is Haidomyrmecinae in simple terms?

Why does Haidomyrmecinae 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 Haidomyrmecinae?

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 Haidomyrmecinae.