chemistry

Miacis

Miacis is a chemistry 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 Miacis rather than just read about it. In short: Miacis ("small point") is an extinct genus of placental mammals from clade Carnivoraformes, that lived in North America from the early to middle Eocene. Description Miacis was five-clawed, similar in size to a stoat (~30 cm, tail not included), weighed between 1 and 7 kg, and likely had highly reversible hind feet that assisted in its arboreal lifestyle, similar to those of a squirrel.

Key takeaways

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

Reference excerpt

Miacis ("small point") is an extinct genus of placental mammals from clade Carnivoraformes, that lived in North America from the early to middle Eocene.

Description Miacis was five-clawed, similar in size to a stoat (~30 cm, tail not included), weighed between 1 and 7 kg, and likely had highly reversible hind feet that assisted in its arboreal lifestyle, similar to those of a squirrel. It retained some primitive characteristics such as a low skull, a long slender body, a long tail, and short legs. Miacis retained 44 teeth, although some reductions in this number were apparently in progress and some of the teeth were reduced in size.

The hind limbs were longer than the forelimbs, the pelvis was dog-like in form and structure, and some specialized traits were present in the vertebrae. It had retractable claws, agile joints for climbing, and binocular vision. Miacis and related forms had brains that were relatively larger than those of the creodonts, and the larger brain size as compared with body size probably reflects an increase in intelligence. Like many other early carnivoramorphans, it was well suited for an arboreal climbing lifestyle with needle-sharp claws, limbs, and joints resembling modern carnivorans. Miacis was probably a very agile forest dweller that preyed upon smaller animals, such as small mammals, reptiles, and birds, and might also have eaten eggs and fruits.

Classification and phylogeny

Classification

History of taxonomy

Since Edward Drinker Cope first described the genus Miacis in 1872, at least twenty other species have been assigned to Miacis. However, these species share few synapomorphies other than plesiomorphic characteristics of miacids in general. This reflects the fact that Miacis has been treated as a wastebasket taxon and contains a diverse collection of species that belong to the stemgroup within the Carnivoraformes. Many of the species originally assigned to Miacis have since been assigned to other genera and, apart from the type species, Miacis parvivorus, the remaining species are often referred to with Miacis in quotations (e.g. "Miacis" latidens). The following table lists the former Miacis species in chronological order of their original description and notes the reassignments to other genera.

Phylogeny The phylogenetic relationships of genus Miacis are shown in the following cladogram:

Illustrations

Worked examples

Example 1 — a first encounter with Miacis

Start with the simplest possible case. Write down what Miacis claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Miacis 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 Miacis 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 Miacis

In research: Miacis appears in chemistry 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 Miacis 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: Miacis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carnivoraformes, Eocene mammals of North America, Fossil taxa described in 1872, so understanding it makes those chapters shorter.
In everyday life: Look for Miacis 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Miacis in 20 minutes

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

Frequently asked questions

What is Miacis in simple terms?

Miacis ("small point") is an extinct genus of placental mammals from clade Carnivoraformes, that lived in North America from the early to middle Eocene. Description Miacis was five-clawed, similar in size to a stoat (~30 cm, tail not included), weighed between 1 and 7 kg, and likely had highly reve…

Why does Miacis matter?

Because it connects several chemistry 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 Miacis?

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 Miacis.