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Research history of Anoplotherium

Research history of Anoplotherium is a science 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 Research history of Anoplotherium rather than just read about it. In short: The research history of Anoplotherium spans back to 1804 when Georges Cuvier first described the fossils of this extinct artiodactyl and named the genus after describing Palaeotherium, making it one of the first fossil mammal genera to be described as well as having one of the earliest official taxonomic authorities. It was also amongst the first fossil genera to be reconstructed by drawings and biomechanics.

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Reference excerpt

The research history of Anoplotherium spans back to 1804 when Georges Cuvier first described the fossils of this extinct artiodactyl and named the genus after describing Palaeotherium, making it one of the first fossil mammal genera to be described as well as having one of the earliest official taxonomic authorities. It was also amongst the first fossil genera to be reconstructed by drawings and biomechanics. Subsequent descriptions of fossil evidence by Cuvier are also said to have been some of the earliest instances of palaeoneurology and palaeopathology. Anoplotherium was a significant find in palaeontological history and was once an iconic element of text and classroom sources of palaeontology, geology, and natural history. Today, it has a lessened cultural status compared to the 19th century as a result of public interest in Mesozoic dinosaurs or Neogene-Quaternary mammals, but it is still regularly acknowledged in sources of the history of palaeontology. Cuvier recognized four species of Anoplotherium the same year he first created the genus name, among them the type species A. commune. From 1807 to 1812, he described two skeletons of A. commune from the French communes of Pantin and Antony, noting the distinct lack of anatomical analogues among modern mammals and making a hypothesis based on its unique anatomy that it was semi-aquatic. The two other species he named in 1804, A. medium, A. minus, and A. minimum, had their paleobiologies speculated on in 1812 and had their names emended in 1822 to A. (Xiphodon) gracile, A. (Dichobune) leporinum, and A. murinus. The former two species' subgenera were converted into distinct genera in later decades while A. murinus was later assigned to its own genus Amphimeryx. Cuvier in 1822 also named two additional species A. secundaria and A. obliquum, later reassigned to newer genera Diplobune and, provisionally, Haplomeryx respectively. Many species assigned to Anoplotherium were named in later decades and were then subsequently assigned to other genera by other works. Several other species that were also erected within Anoplotherium remain within the genus today, namely A. laurillardi, A. latipes, and A. pompeckji; as a result, four species of Anoplotherium are recognized. In addition, the hypothesis that Anoplotherium was semi-aquatic was proven incorrect by M. Dor in 1938 and replaced by another of facultative bipedalism by Jerry J. Hooker in 2007.

Early Identification

First described remains

In 1804, French naturalist Georges Cuvier wrote about a "remarkable" fossil mammal genus from the gypsum quarries of the outskirts of Paris (known as the Paris Basin), making comparisons of its fossils with those of Palaeotherium, which he had already described shortly before it. These fossils were known by Cuvier as early as 1800 but were not formally described yet. He described Anoplotherium as having tooth sizes similar to Palaeotherium that are otherwise different in form. He considered that the most important trait of the newer genus is the apparent lack of canines, leaving a large gap between the incisors and molars. The fossil specimen of the peculiar animal, Cuvier observed, contained nine teeth leading from the last three-pointed molar to the lateral incisors. To the zoologist, the distinct lack of canines was an unusual trait that few "pachyderms", namely rhinoceroses and hyraxes, had. The difference between the genus and certain "pachyderms," according to Cuvier, was that rhinos and hyraxes either had only four lower incisors total or lacked them while a hemimandible (half a mandible) specimen had three lower incisors. There was a lack of any upper jaw attributable to it, however, making its upper dental diagnoses unknown or only up to speculation at the time. Therefore, he erected the genus name Anoplotherium, basing the etymology on an apparent lack of "offensive" arms and canines by which characterized it. The genus name means "unarmed beast," for which the etymology is a compound of the Greek prefixes αν ('an') meaning 'not', ὅπλον ('hóplon') meaning 'armor, large shield' and the suffix θήρ ('thēr') meaning 'beast' or 'wild animal'. Cuvier named three species of Anoplotherium in the same year, the first of which was the "sheep-sized" A. commune and the other three of which were "smaller species" that he named A. medium, A. minus, and A. minimum. The etymology of the species name A. commune refers to how "common" fossils of the species were while the etymologies of the other two species were based on sizes compared to A. commune. He also attributed a cloven hoof (or didactyl hoof) to A. commune since the specimen appeared to be large-sized. The naturalist had great difficulty in distinguishing between Palaeotherium fossils and Anoplotherium fossils especially since he rejected that idea that the head's proportions automatically indicated limb proportions. However, he figured that the head Palaeotherium' was pig-sized and the similar to a tapir compared to that of Anoplotherium and that the tridactyl fossils belonged it. By contrast, Anoplotherium had all cloven hoof fossils attributed to it and was diagnosed in part by having incisors but no canines, which he thought makes it more similar to ruminants or camels. In 1805, Cuvier reinforced the idea of Anoplotherium having didactyl hooves, justifying that based on additional limb bone remains, it had two toes on its front legs and its hind legs.

Skeletal Discoveries In 1807, Cuvier conducted another series of analyses on Anoplotherium. In comparing the unguals (toes) of the limbs of A. commune, he noticed that the two unguals of the hind foot, are more pointed and elongated than those of the front foot, although he did not know if age correlates in any way with elongations or bluntness of the unguals. He determined that Anoplotherium in terms of extant relatives must have been closest to camelids based on the shapes of the unguals, but he also mentioned that the shortness of the front two pairs of unguals are similar in proportions to the bluntness of the hind unguals of pigs compared to those of their front legs. In addition to the two large toes, A. commune appeared to also have a third index toe of smaller size.

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Illustrations

Worked examples

Example 1 — a first encounter with Research history of Anoplotherium

Start with the simplest possible case. Write down what Research history of Anoplotherium claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Research history of Anoplotherium 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 Research history of Anoplotherium 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 Research history of Anoplotherium

In research: Research history of Anoplotherium appears in science 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 Research history of Anoplotherium 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: Research history of Anoplotherium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anoplotheriidae, Eocene Artiodactyla, History of paleontology, so understanding it makes those chapters shorter.
In everyday life: Look for Research history of Anoplotherium 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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Frequently asked questions

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