science

Gosslingiales

Gosslingiales 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 Gosslingiales rather than just read about it. In short: Gosslingiales is an order of extinct zosterophylls. The zosterophylls were among the first vascular plants in the fossil record, and share an ancestor with the living lycophytes.

Key takeaways

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

Reference excerpt

Gosslingiales is an order of extinct zosterophylls. The zosterophylls were among the first vascular plants in the fossil record, and share an ancestor with the living lycophytes. The group has been divided up in various ways. Hao and Xue in 2013 used the presence or absence of terminal sporangia as a major dividing feature. The order Zosterophyllales was used for species with terminal as well as lateral sporangia, which were considered to have determinate growth, with their sporangia generally being arranged in spikes. The paraphyletic order Gosslingiales was used for species without terminal sporangia (i.e. with only lateral sporangia), which were considered to have indeterminate growth, with fertile branches generally circinate (initially curled up). Species assignable to the Gosslingiales made up about 9% of all confirmed species in the Early Devonian flora.

Taxonomy

Classification Hao and Xue consider the order Gosslingiales to be one of the two major divisions of the zosterophylls (class Zosterophyllopsida). Other sources have used different divisions. Most of the genera placed in the Gosslingiales by Hao and Xue are placed in the Sawdoniales by Kenrick and Crane (1997). However, their Sawdoniales also includes taxa like the family Barinophytaceae that Hao and Xue place in a separate order Barinophytales, outside the zosterophylls, and the genus Hsua, which they regard as a possible rhyniopsid rather than a zosterophyll. The classification of the zoterophylls is unsettled; Edwards and coauthors commented in 2015 that in the almost 50 years since 1966, "there has been an extraordinary proliferation of information on [...] new taxa, many of them endemics that reveal combinations of characters that defy conventional classification".

Phylogeny The Gosslingiales are shown to be a paraphyletic group, basal to the Zosterophyllales, in one analysis by Hao and Xue:

The implication of the cladogram is that the Zosterophyllales – species with terminal sporangia – evolved from within the Gosslingiales. However, a study of zosterophyll diversity over time showed that the proportion of taxa with terminal sporangia declined in the Late Lochkovian when taxa without terminal sporangia evolved.

Genera Genera included in the order are shown in the table below, with their family placement according to Hao and Xue, and the alternative classification of these genera by Kenrick and Crane (1997).

The order also includes Zosterophyllum llanoveranum, but not other species of Zosterophyllum, such as Zosterophyllum myretonianum. A new genus, Ornicephalum, described in 2018, is of uncertain placement between the Zosterophyllales and the Gosslingiales.

References

Bibliography Hao, Shougang & Xue, Jinzhuang (2013), The early Devonian Posongchong flora of Yunnan: a contribution to an understanding of the evolution and early diversification of vascular plants, Beijing: Science Press, ISBN 978-7-03-036616-0, retrieved 2019-10-25 Kenrick, Paul & Crane, Peter R. (1997). The Origin and Early Diversification of Land Plants: A Cladistic Study. Washington, D.C.: Smithsonian Institution Press. ISBN 978-1-56098-730-7.

Worked examples

Example 1 — a first encounter with Gosslingiales

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

In research: Gosslingiales 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 Gosslingiales 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: Gosslingiales is common in secondary-school and first-year university syllabi. It links to neighbouring topics Prehistoric plant orders, Zosterophylls, so understanding it makes those chapters shorter.
In everyday life: Look for Gosslingiales 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 Gosslingiales in 20 minutes

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

Frequently asked questions

What is Gosslingiales in simple terms?

Gosslingiales is an order of extinct zosterophylls. The zosterophylls were among the first vascular plants in the fossil record, and share an ancestor with the living lycophytes.

Why does Gosslingiales 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 Gosslingiales?

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 Gosslingiales.