biology

Kenyasaurus

Kenyasaurus 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 Kenyasaurus rather than just read about it. In short: Kenyasaurus is an extinct genus of basal tangasaurid known from the Early Triassic period of Coast Province, southeastern Kenya. It contains a single species, Kenyasaurus mariakaniensis.

Key takeaways

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

Reference excerpt

Kenyasaurus is an extinct genus of basal tangasaurid known from the Early Triassic period of Coast Province, southeastern Kenya. It contains a single species, Kenyasaurus mariakaniensis.

Discovery Kenyasaurus is known only from the holotype specimen, KNM-MA1, a well preserved and partially complete postcranial skeleton, lacking much of the neck, pectoral girdle and forelimb, which is hosted at the Kenya National Museum. It was found at the Mariakani locality which is located 25 miles from Mombasa, southeastern Kenya. It was collected from the upper part of the Maji ya Chumvi Beds (Maji-Ya-Chumvi Formation). These beds form the lower part of the Middle Duruma Sandstone Series (Duruma Group) and on the basis of lithological similarities with beds in Tanzania and Madagascar were dated to the Induan and Olenekian stages of the Early Triassic period, about 251.0-245 million years ago. This specimen represents the only reptilian fossils currently known from these beds.

Description Kenyasaurus is a relatively small, lightly built, general lizard-like form. In Kenyasaurus original description, Harris and Carroll (1977) assigned it to the "Eosuchia" (a defunct clade that used to unit all diapsids more advanced than Araeoscelis) on the basis of its well developed sternum and that the fifth distal tarsal is not a separate element, but the fifth metatarsal is not hooked. It was considered to be most closely related to the aquatic eosuchians Tangasaurus and Hovasaurus (from Tanzania and Madagascar) based on its small size and general body proportions. Harris and Carroll noted that its tail is not specialized as a swimming organ as it is in tangasaurids. Philip J. Currie (1982) redescribed Tangasaurus and its relationships with other "eosuchians". He diagnosed Kenyasaurus on the basis of five autapomorphies: It possesses low but anteroposteriorly elongate neural spines in the dorsal region, 56 caudal vertebrae and 28 pairs of caudal ribs and transverse processes. Its astragalus is almost triangular rather than primitive L-shape and it has pronounced process on fifth metatarsal for insertion of peroneus brevis. Currie (1982) united two subfamilies within the Tangasauridae: Kenyasaurinae (that he named to include Kenyasaurus and Thadeosaurus, both are thought to be terrestrial) and Tangasaurinae (to include the aquatic Tangasaurus and Hovasaurus). He allied Tangasauridae and Youngina together within superfamily Younginoidea which he named. Currie (1980) named Acerosodontosaurus, and allied it with Younginoidea in the clade Younginiformes. Currie's (1982) classification of the Younginiformes had been accepted by many scientists before they could perform large and computerized analyses. More recent works that use phylogenetic analyses usually suggest that neither Younginoidea nor Younginiformes are monophyletic. Constanze Bickelmann, Johannes Müller and Robert R. Reisz (2009) redescribed Acerosodontosaurus and suggested an aquatic lifestyle for it. Their analysis is figured below, and it found support for two distinct families within "Younginiformes": the aquatic Tangasauridae, and the terrestrial Younginidae (in partial polytomy with Tangasauridae). However, they found no support for the inclusion of Kenyasaurus within any of those families. More resolved results were obtained by Reisz et al. (2011) in their description of Orovenator. However, those results required the exclusion of the fragmentary taxa Galesphyrus, Kenyasaurus, Palaeagama and Saurosternon from their analysis.

Etymology Kenyasaurus was first described and named by John M. Harris and Robert L. Carroll in 1977 and the type species is Kenyasaurus mariakaniensis. The generic name is derived from the name of the Kenya in which the only known specimen was found, and Greek sauros, meaning "lizard". The specific name is derived from the name of the type locality of the genus, Mariakani.

References

Worked examples

Example 1 — a first encounter with Kenyasaurus

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

In research: Kenyasaurus 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 Kenyasaurus 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: Kenyasaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Diapsids, Early Triassic reptiles of Africa, Fossil taxa described in 1977, so understanding it makes those chapters shorter.
In everyday life: Look for Kenyasaurus 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 Kenyasaurus in 20 minutes

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

Frequently asked questions

What is Kenyasaurus in simple terms?

Kenyasaurus is an extinct genus of basal tangasaurid known from the Early Triassic period of Coast Province, southeastern Kenya. It contains a single species, Kenyasaurus mariakaniensis.

Why does Kenyasaurus 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 Kenyasaurus?

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 Kenyasaurus.