biology

Lapparentosaurus

Lapparentosaurus 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 Lapparentosaurus rather than just read about it. In short: Lapparentosaurus is a genus of sauropod dinosaur from the Middle Jurassic. Its fossils were found in Madagascar (Isalo III Formation).

Key takeaways

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

Reference excerpt

Lapparentosaurus is a genus of sauropod dinosaur from the Middle Jurassic. Its fossils were found in Madagascar (Isalo III Formation). It contains one species, Lapparentosaurus madagascariensis. The genus and species were named by José Bonaparte in 1986. The classification of Lapparentosaurus is controversial, as it exhibits a combination of characteristics of basal sauropods and titanosauriforms.

Discovery and naming In 1895 Richard Lydekker named a new species of Bothriospondylus, B. madagascariensis based on fossils found before 1894 by Joseph Thomas Last in the Majunga Basin in layers of the Bathonian, the Isalo III Formation. In a 1975 unpublished thesis, A. Ogier described a large amount of juvenile sauropod material, also from the Isalo III Formation, that he identified as more specimens of Bothriospondylus. In 1986, José Fernando Bonaparte considered the referral of all the Malagasy sauropod material to Bothriospondylus to be unjustified, and due to the distinctiveness of the material described by Ogier, Bonaparte proposed the new genus and species Lapparentosaurus madagascariensis for it. He designated two neural arches of dorsal vertebrae, MAA 91-92, as the holotype of his new species. The generic name honours Albert-Félix de Lapparent. Upchurch and colleagues considered Bonaparte's diagnosis of Lapparentosaurus to be inadequate, but accepted it as a valid taxon due to its unusual combination of characteristics of titanosauriforms and basal sauropods.

Specimens Much more abundant material has been referred, from at least three but perhaps as much as ten individuals from different growth stages. This includes vertebrae and limb elements but no skulls. Age determination studies performed using growth ring counts suggest that this sauropod took 31–45 years to reach sexual maturity and was relatively fast-growing given the presence of a large amount of fibrolamellar bone.

Classification The phylogenetic position of Lapparentosaurus was long poorly understood. It exhibits an unusual combination of characters of both basal and derived sauropods. It has been classified as a brachiosaurid or an indeterminate titanosauriform. However, recent phylogenetic analyses have shown it to be a basal eusauropod, not closely related to brachiosaurids at all. After many decades, Emilie Läng in 2008 recovered a traditional Cetiosauridae including Lapparentosaurus. An in-depth revision in 2019 of the genus by Raveloson, Clark & Rasoamiaramana recovered a similar position with Lapparentosaurus being part of a paraphyletic Cetiosauridae, also including a multitude of similar Middle Jurassic cetiosaurids such as Chebsaurus, Ferganasaurus, and Cetiosaurus. This position is supported by the presence of two autapomorphies common on both Lapparentosaurus and Cetiosaurus: a pyramid-shaped neural spine from the anterior dorsal vertebrae with tapering in shape or not flaring distally and loss of the spinodiapophyseal lamina on the dorsal vertebrae.

Gallery All possible remains of Lapparentosaurus:

References

Illustrations

Worked examples

Example 1 — a first encounter with Lapparentosaurus

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

In research: Lapparentosaurus 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 Lapparentosaurus 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: Lapparentosaurus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bathonian dinosaurs, Dinosaur genera, Dinosaurs of Madagascar, so understanding it makes those chapters shorter.
In everyday life: Look for Lapparentosaurus 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 Lapparentosaurus in 20 minutes

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

Frequently asked questions

What is Lapparentosaurus in simple terms?

Lapparentosaurus is a genus of sauropod dinosaur from the Middle Jurassic. Its fossils were found in Madagascar (Isalo III Formation).

Why does Lapparentosaurus 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 Lapparentosaurus?

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 Lapparentosaurus.