science

Hydrophiinae

Hydrophiinae 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 Hydrophiinae rather than just read about it. In short: Hydrophiinae is a subfamily of venomous snakes in the family Elapidae. It contains most sea snakes and many genera of venomous land snakes found in Australasia, such as the taipans (Oxyuranus), tiger snakes (Notechis), brown snakes (Pseudonaja) and death adders (Acanthophis).

Key takeaways

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

Reference excerpt

Hydrophiinae is a subfamily of venomous snakes in the family Elapidae. It contains most sea snakes and many genera of venomous land snakes found in Australasia, such as the taipans (Oxyuranus), tiger snakes (Notechis), brown snakes (Pseudonaja) and death adders (Acanthophis).

Taxonomy

Phylogeny and classification Historically, subfamily Hydrophiinae included all "sea snakes" and was commonly used to refer to both the true sea snakes (tribe Hydrophiini) and the sea kraits (Laticauda). However, large-scale molecular phylogenetic analyses and studies integrating phenotypic data (including morphological, ecological, and cytogenetic characteristics) with molecular data support the hypothesis that Laticauda is the sister group to all other hydrophiines. This clade containing all hydrophiines except Laticauda is sometimes referred to as Oxyuraninae. Given its basal position, Laticauda is sometimes placed in a separate subfamily, Laticaudinae, sister to Hydrophiinae sensu stricto. Molecular evidence further suggests that true sea snakes (Hydrophiini) are more closely related to terrestrial oxyuranine elapids than to Laticauda, implying that marine adaptations evolved convergently in the two groups. Sanders et al. (2008) identified the closest extant relatives of Hydrophiini as Australasian terrestrial elapids. Maximum likelihood analysis suggested that Hemiaspis, a semi-aquatic genus known as "swamp snakes," is sister to sea snakes. In contrast, maximum parsimony analysis in the same study recovered Hydrophiini as sister to a broader Notechis group, including genera such as Hoplocephalus, Paroplocephalus, Tropidechis, Notechis, Austrelaps, Drysdalia, and Echiopsis. Although subsequent phylogenetic efforts have focused on relationships within Hydrophiini, broader genomic sampling across Hydrophiinae may further clarify these interrelationships. Despite uncertainty surrounding the broader relationships within Hydrophiinae, Sanders et al. (2008) presented strong molecular support for the monophyly of Hydrophiini, the "true sea snakes." This group is characterized by two morphological synapomorphies: dorsally oriented nostrils located posteriorly, and nostrils sealable by fleshy valvular flaps.

Genera According to the Reptile Database, Hydrophiinae contains the following 38 genera: (Sea snakes are marked with asterisks.)

References

Illustrations

Worked examples

Example 1 — a first encounter with Hydrophiinae

Start with the simplest possible case. Write down what Hydrophiinae 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 Hydrophiinae 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 Hydrophiinae 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 Hydrophiinae

In research: Hydrophiinae 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 Hydrophiinae 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: Hydrophiinae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elapidae, Venomous snakes, so understanding it makes those chapters shorter.
In everyday life: Look for Hydrophiinae 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 Hydrophiinae in 20 minutes

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

Frequently asked questions

What is Hydrophiinae in simple terms?

Why does Hydrophiinae 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 Hydrophiinae?

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 Hydrophiinae.