What animals show convergent evolution?
An example of convergent evolution is the similar nature of the flight/wings of insects, birds, pterosaurs, and bats. All four serve the same function and are similar in structure, but each evolved independently.
How did animals evolve teeth?
Teeth are assumed to have evolved either from ectoderm denticles that folded and integrated into the mouth (outside–in theory), or from endoderm pharyngeal teeth (primarily formed in the pharynx of jawless vertebrates) (inside–out theory).
What animals have Hypsodont teeth?
The teeth of cows and horses are hypsodont. The opposite condition, low-crowned teeth, is termed brachydont. Human teeth are brachydont. In some species, hypsodont teeth continue to grow throughout an animal’s life (e.g., many species of the rodent subfamily Arvicolinae, family Muridae).
What animals have Tribosphenic molars?
The third group of living mammals, the monotremes (represented today by the platypus and the echidna), lack teeth, but their ancestors, it seems, had the tribosphenic variety. The morphology of tribosphenic molars is so complex that researchers had largely assumed that they emerged only once in evolutionary history.
Are dolphins and sharks an example of convergent evolution?
We know that dolphins and sharks are not closely related, and they didn’t inherit their similar body shapes from a common ancestor. Their streamlined bodies, dorsal fins and flippers are the result of convergent evolution.
What is an example of convergent?
Convergent evolution is when different organisms independently evolve similar traits. For example, sharks and dolphins look relatively similar despite being entirely unrelated.
What animal has the most teeth in the world?
On land. Deep in South America’s rainforests, the giant armadillo (Priodontes maximus) tops the land mammal tooth count, at 74 teeth.
What animal has 40 teeth?
Hippos are tricky. When they open their mouths, it might look like they have only four teeth, but they actually have 40!
Why do horses have high crowned teeth?
The evolution of high-crowned molars among horses (Family Equidae) is thought to be an adaptation for abrasive diets associated with the spread of grasslands. The sharpness and relief of the worn cusp apices of teeth (mesowear) are a measure of dietary abrasion.
Do humans have Carnassial teeth?
Adult humans have only 32. Wolves have several types of teeth that serve different purposes while hunting or eat- ing. These teeth include incisors, canines, carnassial and molars. Incisors are in the front of the mouth.
What are some examples of convergent evolution in animals?
Marsupial kangaroos and wallabies have many resemblances to the maras (a large rodent from the cavy family ( Caviidae )), rabbits and hares ( lagomorphs ). The marsupial lion, Thylacoleo carnifex, had retractable claws, the same way the placental felines ( cats) do today.
What kind of teeth are low crowned teeth?
Brachydont or low-crowned teethare what is seen in man, carnivores such as dogsand cats, and pigs. This type of tooth consists of a crownabove the gingiva, a constricted neckat the gum line, and a rootembedded in the jawbone. The crown is encased in enamel and the root in cementum.
Which is an example of a hypsodont tooth?
Examples of this type of teeth include all of the permanent teeth of horsesand cheek teeth of ruminants. Hypsodont teeth are usually described as having a body, much of which is below the gum line, and root, which is embedded in the alveolus of the jaw bone. Enamel covers the entire body of the tooth, but not the root.
How did the notoungulate Order of mammals evolve?
This recently extinct order of mammals evolved in a context of important geological, climatic, and environmental variations. Interestingly, notoungulates were mostly herbivorous and acquired high-crowned teeth very early in their evolutionary history.