biology

Tylopterella

Tylopterella 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 Tylopterella rather than just read about it. In short: Tylopterella is a genus of eurypterid, a group of extinct aquatic arthropods. Only one fossil of the single and type species, T. boylei, has been discovered in deposits of the Late Silurian period (Ludlow epoch) in Elora, Canada.

Key takeaways

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

Reference excerpt

Tylopterella is a genus of eurypterid, a group of extinct aquatic arthropods. Only one fossil of the single and type species, T. boylei, has been discovered in deposits of the Late Silurian period (Ludlow epoch) in Elora, Canada. The name of the genus is composed by the Ancient Greek words τύλη (túlē), meaning "knot", and πτερόν (pteron), meaning "wing". The species name boylei honors David Boyle, who discovered the specimen of Tylopterella. It is a poorly-known genus whose carapace (dorsal plate of the prosoma, head) was semiovate bordered by a marginal rim, with eyes laterally placed, a preabdomen and postabdomen (the two halves of the abdomen) with six segments each and a short spike-like telson (which was the posteriormost division of the body). It reached a total length of 7.5 centimetres (2.9 inches). These characteristics place Tylopterella in the family Onychopterellidae together with Onychopterella. Tylopterella is notable for its thick ornamentation and general body surface. Its paired tubercles or knobs in the top of its second to fifth segments differentiates it from many other eurypterids. This thickness that its body possessed is due to the highly saline conditions to which Tylopterella had to adapt in the Guelph Formation; other organisms with reinforced shells have also been found in the same place.

Description

Like the other onychopterellids, Tylopterella was a small eurypterid. The total size of the only known specimen is estimated at only 7.5 centimetres (2.9 inches). Tylopterella is a little-known genus; the type specimen of T. boylei, which conserves the dorsal part of the body, represents its only record thus far. The carapace (dorsal plate of the prosoma, head) had a semiovate (nearly oval) shape, was rounded anteriorly and truncated (shortened as by cutting it) posteriorly and bordered by a highly raised, narrow rim more marked at the sides of the carapace. It was wider than long, and was notable for the extraordinary thickness of its surface and ornamentation. The carapace was 2 cm long (0.8 in) and 2.7 cm wide (1.1 in). The eyes were more or less laterally placed, reniform (bean-shaped) and prominent, with about 0.4 cm (0.16 in) in the greatest diameter and separated between them by 0.6 cm (0.23 in). Equidistantly from the eyes (that is, as far from one eye as from the other), there was a small rounded prominence in which the ocelli (simple eye-like sensory organs) were located. The surface of the carapace was granulate (with granules) and had an ornamentation which consisted of minute rounded tubercles, some isolated and others confluent in sets of two or three. It was strengthened by prominent calcareous (with calcium) deposits. As in the rest of eurypterids, the opisthosoma (abdomen) had twelve segments. It was divided into the preabdomen (segments 1 to 6), which was telescoped (with segments overlapping each other) and postabdomen (segments 7 to 12). It was thick, short and compact, specially in the two last segments. It was covered by a calcareo-chitinous (with chitin) layer. Each of the second to fifth tergites (dorsal half of the segment) carried in its median line a pair of single large, solid, prominent and elongated tubercles or knobs. They were reniform at the base and somewhat bilobed (with two lobes) at the top. The telson (the posteriormost division of the body) was like a gradually narrowing, slightly curved and pointed spine. It reached a length of 1.5 cm (0.6 in). Fragments of the fourth appendage (limb) and the paddle of the swimming leg (sixth and last pair of appendages) are also preserved.

History of research

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Tylopterella

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

In research: Tylopterella 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 Tylopterella 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: Tylopterella is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eurypterids of North America, Fossil taxa described in 1951, Fossils of Canada, so understanding it makes those chapters shorter.
In everyday life: Look for Tylopterella 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 Tylopterella in 20 minutes

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

Frequently asked questions

What is Tylopterella in simple terms?

Why does Tylopterella 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 Tylopterella?

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 Tylopterella.