biology

Hedbergella

Hedbergella 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 Hedbergella rather than just read about it. In short: Hedbergella is an extinct genus of planktonic foraminifera from the Cretaceous, described by Loeblich and Tappan, 1961, as: Test free, trochospiral, biconvex, umbilicate, periphery rounded with no indication of keel or poreless margin; chambers globular to ovate; sutures depressed, radial, straight or curved; wall calcareous, finely perforate, radial in structure, surface smooth to hispid or rugose; aperture an inte…

Key takeaways

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

Reference excerpt

Hedbergella is an extinct genus of planktonic foraminifera from the Cretaceous, described by Loeblich and Tappan, 1961, as: Test free, trochospiral, biconvex, umbilicate, periphery rounded with no indication of keel or poreless margin; chambers globular to ovate; sutures depressed, radial, straight or curved; wall calcareous, finely perforate, radial in structure, surface smooth to hispid or rugose; aperture an interiomarginal, extraumbilical-umbilical arch commonly bordered above by a narrow lip or spatulate flap, ... Includes species otherwise similar to Praeglobotruncana but which lack a keel or poreless margin, hence is regarded as a separate genus rather than as a subgenus of Praeglobotruncana as by Banner and Blow (1959). Hedbergella was named by Brönnimann and Brown in 1958, and is included in the family Hedbergellidae and the suborder Globigerinina. Hedbergella ranges through most of the Cretaceous, from the Hauterivian to the Maastrichtian at the end.

Related genera Genera possibly related closely to Hedbergella are Asterohedbergella, Costellagerina, and Whiteinella, which are included with Hedbergella in the Hedbergellinae, but which have shorter ranges. Asterohedbergella, which has a stellate outline, is from the Upper Cretaceous (M. to U. Cenomanian) of Israel. Costellagerina, which has a lobate outline, is from the Upper Cretaceous (Cenomanian to Campanian) and is cosmopolitan. Whiteinella, which has a pustulate surface, is from the U. Cretaceous (M. Cenomanian to M. Turonian), and is also cosmopolitan. The species Muricohedbergella delrioensis, originally described as Globigerina cretacea var. delrioensis, was formerly accepted as Hedbergella delrioensis.

Species Species in Hedbergella include:

References

A.R. Loeblich Jr.; Helen Tappan (1961). "Cretaceous planktonic foraminifera: Part 1: Cenomanian". Micropaleontology. 7 (3, July 1961). doi:10.2307/1484364. JSTOR 1484364. A.R. Loeblich Jr.; Helen Tappan (1988). "Hedbergellidae". Forminiferal Genera and their Classification. Archived from the original on 2012-06-16.

Further reading Reolid, M.; Sanchez-Quinonez, C.A.; Molina, E.; Alegret, L. (1 January 2015). "Palaeoenvironmental turnover across the Cenomanian-Turonian transition in Oued Bahloul, Tunisia: foraminifera and geochemical proxies". Palaeogeography, Palaeoclimatology, Palaeoecology. 417: 491–510. Bibcode:2015PPP...417..491R. doi:10.1016/j.palaeo.2014.10.011.

Worked examples

Example 1 — a first encounter with Hedbergella

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

In research: Hedbergella 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 Hedbergella 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: Hedbergella is common in secondary-school and first-year university syllabi. It links to neighbouring topics Albian genera, Aptian genera, Barremian genera, so understanding it makes those chapters shorter.
In everyday life: Look for Hedbergella 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 Hedbergella in 20 minutes

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

Frequently asked questions

What is Hedbergella in simple terms?

Why does Hedbergella 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 Hedbergella?

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 Hedbergella.