biology

Tikitherium

Tikitherium 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 Tikitherium rather than just read about it. In short: Tikitherium is an extinct genus of mammaliaforms from India, known from a single upper tooth. Originally argued to be a primitive mammaliaform from the Late Triassic, a 2024 study argued that it actually represented the remains of a shrew from the Neogene.

Key takeaways

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

Reference excerpt

Tikitherium is an extinct genus of mammaliaforms from India, known from a single upper tooth. Originally argued to be a primitive mammaliaform from the Late Triassic, a 2024 study argued that it actually represented the remains of a shrew from the Neogene. Tikitherium refers to Tiki, the village located near the Tiki Formation where the specimen was originally thought to have come from, and therium is Greek for “Beast”. The species was named copei in honor of Edward Drinker Cope for his pioneering discoveries towards understanding mammalian molars.

History and discovery Tikitherium copei was first described by Datta in 2005. The first and only specimen is an upper tooth that was thought to have discovered in the lower part of the Late Triassic Tiki Formation, located in the South Rewa Gondwana Basin, India. Both the genus Tikitherium and the species copei were named by Datta in 2005. The currently only known specimen was deposited in the Paleontology Division of the Geological Survey of India, Calcutta. Although only a single tooth was found, it showed several derived features that are similar to other early mammalian dentitions, but further detailed comparisons showed the various differences that allowed this tooth to specifically stand out on its own.

Classification Tikitherium is considered to be mammal based on Datta (2005). However, the phylogeny based on Luo and Martin (2007) places Tikitherium and Docodonta as sister taxa, which are Mammaliformes, based on the shared traits of wear facets and platform on the lingual side of the molars. Although Luo and Martin conclude that Tikitherium and Docodonta are the most closely related, it is debated that Woutersia instead may be the sister taxa to Docodonta due to the similarity of their prominent lingual cusps.

A 2024 study argued that the tooth was actually the upper fourth premolar of a shrew belonging to the subfamily Crocidurinae, and actually dated to the Neogene rather than the Late Triassic as had previously been supposed. The authors suggested that T. copei "likely represents a distinct taxon at least at the species level. However, as the validity of T. copei is not certain, Pal/CHQ-009, the holotype of T. copei, should be currently identified as Crocidurinae gen. et sp. indet."

Description Tikitherium is only known from a single upper tooth, originally argued to be a left molar but currently thought to be a right fourth premolar. The tooth closely resembles members of the modern shrew subfamily Crocidurinae in having a "short horseshoe-shaped protocone", and the hypocone being absent. The tooth is broadly similar to those of species of Suncus. It differs from modern members of Crocidurinae by "a more massive central cusp (paracone) and a more obtuse angle between the paracone axis and the lingual lobe.", which are likely plesiomorphic features.

Geological and paleoenvironment Tikitherium was previously thought to have originated from the Tiki Formation, which is well known for its Late Triassic vertebrates. However, it has since been argued that Tikitherium actually was found in reworked sediments derived from erosion of the Tiki Formation that formed much later during the Neogene. A similar issue was previously reported with Tikiguania which was also previously interpreted as coming from the Tiki Formation, and thus the oldest known squamate, but was later interpreted as modern agamid lizard coming from Neogene or Quaternary deposits.

References

Worked examples

Example 1 — a first encounter with Tikitherium

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

In research: Tikitherium 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 Tikitherium 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: Tikitherium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fossil taxa described in 2005, Fossils of India, Neogene Asia, so understanding it makes those chapters shorter.
In everyday life: Look for Tikitherium 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 Tikitherium in 20 minutes

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

Frequently asked questions

What is Tikitherium in simple terms?

Why does Tikitherium 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 Tikitherium?

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 Tikitherium.