earth science

Pisinna rekohuana

Pisinna rekohuana is a earth 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 Pisinna rekohuana rather than just read about it. In short: Pisinna rekohuana is a species of marine gastropod mollusc in the family Anabathridae. First described by Badwn Powell in 1933 as Estea rekohuana, it is endemic to the waters of New Zealand.

Key takeaways

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

Reference excerpt

Pisinna rekohuana is a species of marine gastropod mollusc in the family Anabathridae. First described by Badwn Powell in 1933 as Estea rekohuana, it is endemic to the waters of New Zealand. There are two subspecies of the gastropod: Pisinna rekohuana rekohuana, primarily found in the south and Pisinna rekohuana lactorubra, primarily found on the north-east coast of the North Island.

Description

Powell described the species as follows:

Shell small, ovate, solid. Whorls 4¾, including low dome-shaped protoconch of 1¾ whorls, which is faintly sculptured with closely spaced spiral striae. The surface of the post-nuclear whorls is smooth, but not polished, and apart from faint, slightly oblique axial growth lines, there is no true sculpture. Spire elevated, bluntly conical, one and a-half times height of aperture. Colour reddish-brown, except for a narrow whitish band immediately below the suture, and the peristome and interior of the aperture, which is more yellowish than reddish-brown. Aperture very large, almost circular. Peristome continuous, much thickened within and clearly marked off from the base by a heavy callus. There is no umbilical chink. Pisinna rekohuana is similar in appearance to Pisinna minor and Pisinna subfusca, and can be identified by its size (intermediate between the two) and relatively larger aperture. A subspecies, Pisinna rekohuana lactorubra, was described in 1965 by Winston Ponder, differentiated by its proportionately longer spire and different colour pattern. While Ponder noted a similarity of Pisinna rekohuana lactorubra to Pisinna zosterophila, he believed it was best to classify it as a subspecies of Pisinna rekohuana, due to its distribution and the relationships of forms between the three groups. The species measures 2.0mm, by 0.9mm, while the subspecies Pisinna rekohuana lactorubra measures 3.2mm by 1.5mm.

Distribution The species is endemic to New Zealand. The holotype was collected by Powell himself in February 1933 at Waitangi, Chatham Islands. It is found around the South Island, in the waters of the Chatham Islands, commonly at Stewart Island, the Auckland Islands and the Kermadec Islands. Pisinna rekohuana lactorubra is primarily found to the north-east of North Island under stones in the littoral zone, preferring open coasts. It has been identified on Manawatāwhi / Three Kings Islands, the Manukau Harbour on the west coast of the North Island, and the Mahia Peninsula. Since the subspecies was first described, Pisinna rekohuana rekohuana has been identified as living in the range previously thought to be that of Pisinna rekohuana lactorubra, such as the north-east coast of the North Island, and the Mahia Peninsula.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pisinna rekohuana

Start with the simplest possible case. Write down what Pisinna rekohuana claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth 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 Pisinna rekohuana 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 Pisinna rekohuana 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 Pisinna rekohuana

In research: Pisinna rekohuana appears in earth 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 Pisinna rekohuana 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: Pisinna rekohuana is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anabathridae, Endemic molluscs of New Zealand, Gastropods described in 1933, so understanding it makes those chapters shorter.
In everyday life: Look for Pisinna rekohuana 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 Pisinna rekohuana in 20 minutes

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

Frequently asked questions

What is Pisinna rekohuana in simple terms?

Pisinna rekohuana is a species of marine gastropod mollusc in the family Anabathridae. First described by Badwn Powell in 1933 as Estea rekohuana, it is endemic to the waters of New Zealand.

Why does Pisinna rekohuana matter?

Because it connects several earth 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 Pisinna rekohuana?

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 Pisinna rekohuana.