biology

Romalea

Romalea 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 Romalea rather than just read about it. In short: Romalea is a genus of grasshoppers native to the Southeastern and South-central United States. As traditionally defined, it contains a single species, Romalea microptera, known commonly as the Georgia thumper, eastern lubber grasshopper, Florida lubber, or Florida lubber grasshopper, although some recent authorities regard Taeniopoda as a junior synonym, in which case there are about a dozen Romalea species in the s…

Key takeaways

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

Reference excerpt

Romalea is a genus of grasshoppers native to the Southeastern and South-central United States. As traditionally defined, it contains a single species, Romalea microptera, known commonly as the Georgia thumper, eastern lubber grasshopper, Florida lubber, or Florida lubber grasshopper, although some recent authorities regard Taeniopoda as a junior synonym, in which case there are about a dozen Romalea species in the southern United States, Mexico and Central America. R. microptera is one of the most distinctive grasshopper species within the Southeastern US, and is well known for its relatively large size and its unique coloration.

Taxonomy Romalea is the type genus of the family Romaleidae and tribe Romaleini. It has been suggested that the valid name for Romalea microptera is Romalea guttata. However, microptera has been marked as a nomen protectum by the ICZN, making guttata a synonym. As traditionally defined, Romalea only contains the species R. microptera, but recent authorities regard Taeniopoda as a synonym, in which case there are about a dozen Romalea species. Romalea and Taeniopoda have generally been separated based on color and pronotum, but more comprehensive morphological data and genetic data do not support their separation. Their wild distributions do not overlap, but in captivity R. microptera can produce fertile hybrids at least with T. eques (western horse lubber grasshopper), showing their very close relations.

Life cycle

R. microptera grows through several stages, like all insects. When in the nymph stage, it is smaller than in the adult stage, wingless, and completely black except for one or more yellow, orange, or red stripes. The adult stage has wings that are half the length of its body, and become either a dull yellow often characterized by black spots and markings, a bright orange with black markings, or entirely black (as in the nymph stage) with yellow or red striping. In the black adult color phase, the grasshopper is widely known by the name "diablo" or "black diablo". In Louisiana, they are known as the "devil's horse" or cheval-diable. The insect is also colloquially known as a "graveyard grasshopper". In Mississippi, they are known as the "giant locust".

Range R. microptera inhabits regions west of North Carolina to Tennessee, in Georgia, Alabama, Mississippi, Louisiana, Arkansas, and Texas, and throughout Florida. They live in open pinewoods, weedy vegetation, and weedy fields.

Size and wings R. microptera and Taeniopoda eques (western horse lubber grasshopper) are the largest grasshoppers in the United States. Adult males of R. microptera typically are 4.3–5.5 cm (1.7–2.2 in) long and adult females 5–7 cm (2.0–2.8 in) long, but can exceptionally reach 9 cm (3.5 in). Their wings are rarely half the length of the abdomen; most of the time, they are much smaller, and cannot be used for flight.

Defense

R. microptera has several defense strategies. The first is its brightly colored pattern (aposematism) to warn predators that it is unpleasant tasting. The second is that it emits a foul-smelling and foul-tasting, foamy secretion from its thorax when it is disturbed. The secretion is dark colored and opaque. The final strategy is that it lets off a loud hissing sound which can scare animals. Whereas most predatory vertebrates avoid R. microptera because of its toxicity, this does not protect it from predatory invertebrates; however, most predatory invertebrates are unable to catch and kill adult R. microptera because of its relatively large size.

Research A quantitative analysis of the distribution of tritium labeled DNA among chromosomes during meiosis in Romalea microptera led to the conclusion that most exchanges reflected breakage and reciprocal exchange between (non-sister) homologous chromatids.

Gallery

References

External links Media related to Romalea microptera at Wikimedia Commons Sarah Sue Goldsmith (May 4, 1999). "Black grasshoppers munch their way across South Louisiana". Louisiana State University.

Illustrations

Worked examples

Example 1 — a first encounter with Romalea

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

In research: Romalea 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 Romalea 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: Romalea is common in secondary-school and first-year university syllabi. It links to neighbouring topics Insects described in 1817, NatureServe secure species, Orthoptera of North America, so understanding it makes those chapters shorter.
In everyday life: Look for Romalea 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 Romalea in 20 minutes

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

Frequently asked questions

What is Romalea in simple terms?

Why does Romalea 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 Romalea?

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 Romalea.