biology

Laevicaulis alte

Laevicaulis alte 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 Laevicaulis alte rather than just read about it. In short: Laevicaulis alte, or the tropical leatherleaf, is a species of tropical land slug, a terrestrial pulmonate gastropod mollusk in the family Veronicellidae, the leatherleaf slugs. Description Laevicaulis alte is a round, dark-coloured slug with no shell, 7 or 8 cm (2.8 or 3.1 in) long.

Key takeaways

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

Reference excerpt

Laevicaulis alte, or the tropical leatherleaf, is a species of tropical land slug, a terrestrial pulmonate gastropod mollusk in the family Veronicellidae, the leatherleaf slugs.

Description Laevicaulis alte is a round, dark-coloured slug with no shell, 7 or 8 cm (2.8 or 3.1 in) long. Its skin is slightly tuberculated. The central keel is beige in colour. This slug has a unique, very narrow foot; juvenile specimens have a foot 1 mm (0.039 in) wide and adult specimens have a foot that is only 4 or 5 mm (0.16 or 0.20 in) wide. The tentacles are small, 2 or 3 mm (0.079 or 0.118 in) long, and they are only rarely extended beyond the edge of the mantle.

Parasites This slug is an intermediate host for Angiostrongylus cantonensis, the rat lungworm, a round worm, the most common cause of eosinophilic meningoencephalitis.

Predators Laevicaulis alte is eaten by the frog Rana tigrina.

Distribution

The species is probably indigenous to sub-Saharan Africa, including Tanzania, Botswana and South Africa It has been introduced and has become an invasive species in the following areas:

Southern Asia Taiwan China Ryukyu Islands, Japan United States (Hawaii) Islands in the Indian Ocean Australia (since 1889) Samoa The species is already established in the USA, and is considered to represent a potentially serious threat as a pest, an invasive species which could negatively affect agriculture, natural ecosystems, human health or commerce. Therefore, it has been suggested that this species be given top national quarantine significance in the USA.

Habitat Laevicaulis alte lives in dry areas, mostly at lower altitudes.

Life cycle The slug hatches from eggs. Laevicaulis alte has several adaptations for living in dry conditions: a rounded shape with as small as possible surface area, and a narrow foot to reduce evaporation. Juvenile specimens search for food nearly always at night, and stay buried in the soil during the day. Larger specimens are active during the day sometimes. The slug can grow up from 0.5 cm (0.20 in) to approximately 4 cm (1.6 in) in length in 7 months.

References

External links

articles at PubMed Distribution in Australia Distribution in United States Archived 2008-10-11 at the Wayback Machine In English and in Chinese

Images Drawing of ventral part of body, photo (In Japanese) Laevicaulis alte at Samoan Snail Project Photo (Japanese) Photo (Japanese) Photo (Japanese) Photo (Japanese)

Genome Sequences 18S rRNA Vernacular names

Illustrations

Worked examples

Example 1 — a first encounter with Laevicaulis alte

Start with the simplest possible case. Write down what Laevicaulis alte 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 Laevicaulis alte 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 Laevicaulis alte 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 Laevicaulis alte

In research: Laevicaulis alte 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 Laevicaulis alte 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: Laevicaulis alte is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gastropods described in 1822, NatureServe secure species, Taxa named by André Étienne d'Audebert de Férussac, so understanding it makes those chapters shorter.
In everyday life: Look for Laevicaulis alte 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 Laevicaulis alte in 20 minutes

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

Frequently asked questions

What is Laevicaulis alte in simple terms?

Laevicaulis alte, or the tropical leatherleaf, is a species of tropical land slug, a terrestrial pulmonate gastropod mollusk in the family Veronicellidae, the leatherleaf slugs. Description Laevicaulis alte is a round, dark-coloured slug with no shell, 7 or 8 cm (2.8 or 3.1 in) long.

Why does Laevicaulis alte 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 Laevicaulis alte?

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 Laevicaulis alte.