science

Pseudaxine indicana

Pseudaxine indicana 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 Pseudaxine indicana rather than just read about it. In short: Pseudaxine indicana is a species of monogenean flatworm, which is parasitic on the gills of a marine fish. It belongs to the family Gastrocotylidae.

Key takeaways

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

Reference excerpt

Pseudaxine indicana is a species of monogenean flatworm, which is parasitic on the gills of a marine fish. It belongs to the family Gastrocotylidae.

Systematics Pseudaxine indicana was described based on single contracted specimen, from the gills of the black sea-bream Chrysophrys berda (currently named Acanthopagrus berda) (Sparidae), collected off India. It is a species dubia due to the incomplete description, the lack of material, and the unusual host.

Description Pseudaxine indicana has the general morphology of all species of Pseudaxine, with an elongate body tapering anteriorly and broad posteriorly, comprising an anterior part which contains most organs and a posterior part called the haptor. The haptor is fan-shaped and asymmetrical, inclined to the body but separated from it by a notch, and bears 19 clamps, arranged in a single row. The clamps of the haptor attach the animal to the gill of the fish. The extreme of the haptor carries an elongated proboscis-like process called "the terminal lapet", bearing in the middle of its length a pair of hooks. There are also two oval buccal suckers at the anterior extremity. The digestive organs include an anterior, terminal mouth, an oval pharynx, an oesophagus and a posterior intestine that bifurcates in two lateral branches provided with many lateral branches ramifying especially on the outer side, the branches are not contiguous posteriorly and extend to near the posterior end of the haptor. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium, armed with 24 hooks, a single vagina, an elongate cylindrical ovary and 40 small follicular testespost-ovarian, lying irregularly in the inter-crural field anteriorly in two rows and posteriorly in three rows in posterior half of body proper. Few testes extend into the haptor. Eggs with long filaments at both ends.

Etymology The species name refers to India, the type-locality of the species.

Hosts and localities

The type-host is the black sea-bream Acanthopagrus berda) (Sparidae). The type-locality is off India. It was also recorded on an undefined mackerel “Salala” off Fiji island.

References

Worked examples

Example 1 — a first encounter with Pseudaxine indicana

Start with the simplest possible case. Write down what Pseudaxine indicana 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 Pseudaxine indicana 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 Pseudaxine indicana 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 Pseudaxine indicana

In research: Pseudaxine indicana 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 Pseudaxine indicana 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: Pseudaxine indicana is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animals described in 1945, Fauna of India, Microcotylidae, so understanding it makes those chapters shorter.
In everyday life: Look for Pseudaxine indicana 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 Pseudaxine indicana in 20 minutes

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

Frequently asked questions

What is Pseudaxine indicana in simple terms?

Pseudaxine indicana is a species of monogenean flatworm, which is parasitic on the gills of a marine fish. It belongs to the family Gastrocotylidae.

Why does Pseudaxine indicana 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 Pseudaxine indicana?

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 Pseudaxine indicana.