science

Paterinata

Paterinata 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 Paterinata rather than just read about it. In short: Paterinata is an extinct class of linguliform brachiopods which lived from the lower Cambrian ("Tommotian") to the Upper Ordovician (Hirnantian). It contains the single order Paterinida and the superfamily Paterinoidea.

Key takeaways

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

Reference excerpt

Paterinata is an extinct class of linguliform brachiopods which lived from the lower Cambrian ("Tommotian") to the Upper Ordovician (Hirnantian). It contains the single order Paterinida and the superfamily Paterinoidea. Despite being some of the earliest brachiopods to appear in the fossil record, paterinides stayed as a relatively subdued and low-diversity group even as other brachiopods diversified later in the Cambrian and Ordovician. Paterinides are notable for their high degree of convergent evolution with rhynchonelliform (articulate) brachiopods, which have a similar set of muscles and hinge-adjacent structures.

Anatomy Paterinides had organo-phosphatic shells which were ventribiconvex (both valves convex, the ventral valve moreso) and strophic (with a straight hinge line). Shell ornamentation usually consists of concentric fila (fine ridges) and tiny pits. The tiny larval shell has a smooth outer halo and strongly ornamented inner portion. There are no canals in the shell microstructure.

Hinge structures When seen from behind, each valve appears triangular, with a system of superimposed plates and furrows along the hinge. Each valve has a broad triangular depression edging the hinge, known as a pseudointerarea. The middle of each pseudointerarea hosts a narrower excavation or furrow, known as a notothyrium (in the dorsal valve) or a delthyrium (in the ventral valve). Finally, these furrows may be partially covered by a convex plate-like overgrowth, known as a homeochilidium (in the dorsal valve) or a homeodeltidium (in the ventral valve). The furrow-and-plate pairing creates closed pockets near the hinge, where the pedicle presumably emerged.

Soft tissue The musculature of paterinides seemingly relied on a small number of broad muscles within the shell. There are a pair of large triangular muscle scars near the hinge of the ventral valve, conjoining under the homeodeltidium. There are two pairs of scars in the dorsal valve, one pair set medially (at the center of the shell) and the other set posterolaterally (further back and outwards). These major scars likely correspond to adductor muscles, which close the shell. A subtle pit was present at the tip of the homeochilidium, possibly hosting diductor muscles, which open the shell. Diductor muscles are otherwise only found in articulate brachiopods. The network of mantle canals usually had a saccate form, emphasizing a pair of midline canals (vascula media) which arc outwards once they reach the shell margin.

Subgroups Family Cryptotretidae Pelman, 1979 (lower Cambrian) Aldanotreta Pelman, 1977 ("Tommotian") Askepasma Laurie, 1896 ("Atdabanian") Cryptotreta Pelman, 1977 ("Tommotian") Dzunarzina Ushatinskaya, 1993 ("Atdabanian") Salanygolina Ushatinskaya, 1987 ("Botomian") Family Paterinidae Schuchert, 1893 (lower Cambrian – Upper Ordovician) Dictyonina Cooper, 1942 (Cambrian) Dictyonites Cooper, 1956 (Ordovician) Kolihium Havlicek, 1982 (Lower Ordovician) Lacunites Gorjansky, 1969 (Lower Ordovician) Micromitra Meek, 1873 (Cambrian) Olenekina Ushatinskaya, 1997 (upper Middle Cambrian) Paterina Beecher, 1891 (lower-mid Cambrian) Wynnia? Walcott, 1908 (lower Cambrian)

See also Paleozoic brachiopods Tumulduria

References

Illustrations

Worked examples

Example 1 — a first encounter with Paterinata

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

In research: Paterinata 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 Paterinata 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: Paterinata is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brachiopods, Paleozoic brachiopods, Prehistoric protostome classes, so understanding it makes those chapters shorter.
In everyday life: Look for Paterinata 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 Paterinata in 20 minutes

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

Frequently asked questions

What is Paterinata in simple terms?

Why does Paterinata 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 Paterinata?

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 Paterinata.