biology

Xenocalamus bicolor

Xenocalamus bicolor 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 Xenocalamus bicolor rather than just read about it. In short: Xenocalamus bicolor, also known commonly as the bicoloured quill-snouted snake and the slender quill-snouted snake, is a species of mildly venomous rear-fanged snake in the family Atractaspididae. The species is endemic to Africa.

Key takeaways

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

Reference excerpt

Xenocalamus bicolor, also known commonly as the bicoloured quill-snouted snake and the slender quill-snouted snake, is a species of mildly venomous rear-fanged snake in the family Atractaspididae. The species is endemic to Africa. Four subspecies are recognized as being valid.

Geographic range X. bicolor is found in Angola, Botswana, Democratic Republic of the Congo, Mozambique, Namibia, Republic of South Africa, and Zimbabwe.

Habitat The preferred natural habitat of X. bicolor is savanna, at altitudes of 900–1,400 m (3,000–4,600 ft).

Description X. bicolor exhibits the following characters: Black dorsally. White ventrally including the upper lip and the first two rows of dorsal scales on each side. Total length 43 cm (16+7⁄8 in); tail 3 cm (1+1⁄8 in). Dorsal scales smooth, without apical pits, arranged in 17 rows. Ventrals 218; anal plate divided; subcaudals 24, also divided. Portion of rostral visible from above nearly half as long as the frontal. Frontal extremely large, more than half as long as the shielded part of the head. Internasals large, forming a short median suture. Supraocular very narrow. One large elongate preocular, contacting the posterior nasal, the internasal, the frontal, and the third upper labial. One minute postocular. One temporal. Six upper labials, the first very small, third and fourth entering the eye, the fifth very large and contacting the parietal. One pair of narrow chin shields. Three lower labials in contact with the chin shield. Third lower labial extremely large. (Nota bene: the description above is a description of the species X. bicolor. The subspecies listed below vary somewhat from this description.)

Subspecies Four subspecies are recognized including the nominate race.

Xenocalamus bicolor australis V. FitzSimons, 1946 Xenocalamus bicolor bicolor Günther, 1868 Xenocalamus bicolor lineatus Roux, 1907 Xenocalamus bicolor machadoi Laurent, 1954

Behaviour X. bicolor is terrestrial and fossorial, burrowing in aeolian and alluvial sands.

Diet X. bicolor preys predominately upon amphisbaenians.

Reproduction X. bicolor is oviparous. Eggs are laid in December. Clutch size is 3–4 eggs. The eggs are elongate, approximately 4.5 cm × 1.5 cm (1.77 in × 0.59 in). Each hatchling has a total length (including tail) of 20 cm (7.9 in).

References

Further reading FitzSimons V (1946). "Notes on some African snakes, including a description of a new subspecies of Xenocalamus ". Annals of the Transvaal Museum 20 (4): 379–394. (Xenocalamus bicolor australis, new subspecies, p. 386). Günther A (1868). "Sixth Account of new Species of Snakes in the Collection of the British Museum". Annals and Magazine of Natural History, Fourth Series 1: 413–429. (Xenocalamus bicolor, new species, p. 415 + Plate XIX, figure A). Laurent R (1954). "Reptiles et batraciens de la région de Dundo (Angola) (Duexième note)". Companhia de Diamantes de Angola (Diamang), Serviços Culturais, Publicações Culurais (23): 37–84. (Xenocalamus bicolor machadoi, new subspecies, p. 45). (in French). Roux J (1907). "Sur quelques Reptiles sud-africains ". Revue suisse de zoologie 15: 75–86. (Xenocalamus bicolor var. lineatus, new "variety", pp. 79–80). (in French).

External links iNaturalist link

Illustrations

Worked examples

Example 1 — a first encounter with Xenocalamus bicolor

Start with the simplest possible case. Write down what Xenocalamus bicolor 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 Xenocalamus bicolor 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 Xenocalamus bicolor 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 Xenocalamus bicolor

In research: Xenocalamus bicolor 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 Xenocalamus bicolor 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: Xenocalamus bicolor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Atractaspididae, IUCN Red List least concern species, Reptiles described in 1868, so understanding it makes those chapters shorter.
In everyday life: Look for Xenocalamus bicolor 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 Xenocalamus bicolor in 20 minutes

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

Frequently asked questions

What is Xenocalamus bicolor in simple terms?

Why does Xenocalamus bicolor 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 Xenocalamus bicolor?

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 Xenocalamus bicolor.