biology

Saint Croix racer

Saint Croix racer 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 Saint Croix racer rather than just read about it. In short: The Saint Croix racer (Borikenophis sanctaecrucis) is a possibly extinct species of snake in the family Colubridae that is endemic to the island of Saint Croix in the United States Virgin Islands. Etymology The specific name, sanctaecrucis, refers to the island of Saint Croix, on which the holotype was collected.

Key takeaways

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

Reference excerpt

The Saint Croix racer (Borikenophis sanctaecrucis) is a possibly extinct species of snake in the family Colubridae that is endemic to the island of Saint Croix in the United States Virgin Islands.

Etymology The specific name, sanctaecrucis, refers to the island of Saint Croix, on which the holotype was collected.

Description B. sanctaecrucis may attain a snout-to-vent length (SVL) of 102.5 cm (3.36 ft). It has smooth dorsal scales, which are arranged in 17 rows at midbody. The holotype has a total length of 50 in (130 cm), which includes a tail 17 in (43 cm) long. B. sanctaecrucis is oviparous.

Habitat The preferred natural habitat of B. sanctaerucis is xeric forest.

Conservation

B. sanctaecrucis is feared extinct, as it has not been recorded in over 100 years since the holotype was collected. St. Croix is a densely populated island, and the species is a fairly large snake. If it is extinct, the most probable causes were due to predation from introduced mongooses and deforestation of its habitat. However, recent rediscoveries of other Caribbean reptiles that were also thought extinct bring hope that a small population (probably less than 50 individuals) of B. sanctaecrucis survives somewhere in St. Croix.

References

Further reading Boulenger GA (1894). Catalogue of the Snakes in the British Museum (Natural History). Volume II. Containing the Conclusion of the Colubridæ Aglyphæ. London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xi + 382 pp. + Plates I-XX. (Dromicus sanctæ-crucis, new combination and emendation, p. 122). Cope ED (1862). "Synopsis of the Species of Holcosus and Ameiva, with Diagnoses of new West Indian and South American Colubridæ". Proceedings of the Academy of Natural Sciences of Philadelphia 14: 60–82. (Alsophis sancticrucis, new species, p. 76). Hedges SB, Couloux A, Vidal N (2009). "Molecular phylogeny, classification, and biogeography of West Indian racer snakes of the Tribe Alsophini (Squamata, Dipsadidae, Xenodontinae)". Zootaxa 2067: 1–28. (Borikenophis sanctaecrucis, new combination). Schwartz A, Henderson RW (1991). Amphibians and Reptiles of the West Indies: Descriptions, Distributions, and Natural History. Gainesville: University of Florida Press. 720 pp. ISBN 978-0813010496. (Alsophis sanctaecrucis, p. 576). Schwartz A, Thomas R (1975). A Check-list of West Indian Amphibians and Reptiles. Carnegie Museum of Natural History Special Publication No. 1. Pittsburgh, Pennsylvania: Carnegie Museum of Natural History. 216 pp. (Alsophis sancticrucis, p. 173).

Worked examples

Example 1 — a first encounter with Saint Croix racer

Start with the simplest possible case. Write down what Saint Croix racer 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 Saint Croix racer 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 Saint Croix racer 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 Saint Croix racer

In research: Saint Croix racer 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 Saint Croix racer 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: Saint Croix racer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Borikenophis, Endemic fauna of the United States Virgin Islands, IUCN Red List critically endangered species, so understanding it makes those chapters shorter.
In everyday life: Look for Saint Croix racer 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 Saint Croix racer in 20 minutes

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

Frequently asked questions

What is Saint Croix racer in simple terms?

The Saint Croix racer (Borikenophis sanctaecrucis) is a possibly extinct species of snake in the family Colubridae that is endemic to the island of Saint Croix in the United States Virgin Islands. Etymology The specific name, sanctaecrucis, refers to the island of Saint Croix, on which the holotype…

Why does Saint Croix racer 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 Saint Croix racer?

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 Saint Croix racer.