science

Xibalbanus tulumensis

Xibalbanus tulumensis 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 Xibalbanus tulumensis rather than just read about it. In short: Xibalbanus tulumensis (previously Speleonectes tulumensis – Speleonectes = 'cave swimmer'; tulumensis = 'occurring at Tulum' – Xibalbanus = 'from Xibalba') is a venomous, hermaphroditic crustacean found in anchialine caves on the Yucatán Peninsula in the Caribbean Sea. This blind remipede liquefies the body contents of other crustaceans with a venom similar to that of rattlesnakes, and which includes digestive enzym…

Key takeaways

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

Reference excerpt

Xibalbanus tulumensis (previously Speleonectes tulumensis – Speleonectes = 'cave swimmer'; tulumensis = 'occurring at Tulum' – Xibalbanus = 'from Xibalba') is a venomous, hermaphroditic crustacean found in anchialine caves on the Yucatán Peninsula in the Caribbean Sea. This blind remipede liquefies the body contents of other crustaceans with a venom similar to that of rattlesnakes, and which includes digestive enzymes and a paralysing toxin. In her 1987 description, Smithsonian biologist Jill Yager wrote 'Body elongate, slender, without eyes or pigment. Cephalic shield small, tapering slightly at anterior end. Trunk segment numbers increasing with age, maximum number examined was 36 segments'. The numerous legs are used as oars for swimming. The species is 25–30 millimetres (1.0–1.2 in) long, and found in cenotes close to the sea, with salty seawater lying beneath the fresh water, and grading smoothly from one type to the other (halocline). Stygobites are organisms found in subterranean groundwater habitats or anchialine caves, and characterised morphologically by loss or extreme reduction of eyes and pigment, frequently with attenuated bodies or appendages. The evolution of this body shape is known as troglomorphy. X. tulumensis is one of 24 species in the class Remipedia, all of which are stygobitic, and distributed throughout the Caribbean, the Canary Islands, and Western Australia. They are free-swimming crustaceans, typically living in low-oxygen, brackish waters of near-marine caves, and their distribution is linked to the ancient Tethys Sea. The feeding technique of X. tulumensis is unique among crustaceans, and its venom is a useful adaptation that to some extent compensates for being sightless in a nutrient-poor or oligotrophic environment. Venom is common in all the arthropod subphyla, but was believed to be completely absent from the approximately 70,000 known species of crustacean until the discovery of X. tulumensis. In 2007, researchers noticed that the species' front claws resembled hypodermic needles, leading to speculation that their purpose might be to inject toxins into their prey. Venom-filled reservoirs have since been found attached to the needles, packed in muscles that can force out the venom. Glands in the centre of the body produce the venom and connect to the reservoirs. It is suspected that all remipede species have some type of poison apparatus since all have fangs on the first maxilla.

References

External links Discover Magazine Archived 2016-03-04 at the Wayback Machine Image of Xibalbanus tulumensis Archived 2012-10-16 at the Wayback Machine Stefan Koenemann, Thomas M. Iliffe & Joris van der Ham (2003). "Three new sympatric species of Remipedia (Crustacea) from Great Exuma Island, Bahamas Islands". Contributions to Zoology. 72 (4): 227–252. doi:10.1163/18759866-07204004. Archived from the original on 2013-10-29. Retrieved 2013-10-23.

Illustrations

Worked examples

Example 1 — a first encounter with Xibalbanus tulumensis

Start with the simplest possible case. Write down what Xibalbanus tulumensis 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 Xibalbanus tulumensis 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 Xibalbanus tulumensis 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 Xibalbanus tulumensis

In research: Xibalbanus tulumensis 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 Xibalbanus tulumensis 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: Xibalbanus tulumensis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cave crustaceans, Crustaceans described in 1987, Remipedia, so understanding it makes those chapters shorter.
In everyday life: Look for Xibalbanus tulumensis 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 Xibalbanus tulumensis in 20 minutes

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

Frequently asked questions

What is Xibalbanus tulumensis in simple terms?

Why does Xibalbanus tulumensis 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 Xibalbanus tulumensis?

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 Xibalbanus tulumensis.