Latest news with #Anatolepisheintzi
Yahoo
23-05-2025
- Science
- Yahoo
Human Teeth Evolved From Body Armor of Extinct Species
A new study, published on May 21 in the journal Nature, has revealed surprising information about the origins of human teeth. Our teeth evolved from the piercing 'body armor' of extinct fish, which existed about 465 million years ago. The study explained how sensory tissue found within the exoskeletons of the fish can be tied to the same "genetic toolkit" that comprises human teeth. "This shows us that 'teeth' can also be sensory even when they're not in the mouth," Yara Haridy, the study's co-author, said in a information came as a surprise to Haridy and her fellow researchers, who initially wanted to find the oldest vertebrate fossil ever recorded. Vertebrate fossils can typically be identified because they contain internal tubules which store dentine, the calcified tissue which is found under the enamel of human teeth. Dentine is also found inside the external bumps on the armor of ancient fishes. While analyzing the 'first fish' species, Anatolepis heintzi, scientists found what appeared to be large pores filled with dentine. They compared the fossil to several ancient and modern animals, but upon further inspection, they found the pores to be more similar to the sensory organs which crabs have on their shells. That means Anatolepis heintzi is an invertebrate arthropod rather than a vertebrate were astonished to discover that fish and ancient arthropods produce the same type of mineralized tissue. They believe that human teeth began evolving into their modern form around 460 million years ago after animals utilized the same "genetic toolkit" to make their teeth. "Viewed through this evolutionary lens, the fact that teeth in the mouth are extremely sensitive is less of a mystery, and more a reflection of their evolutionary origins within the sensory armor of early vertebrates," the study Teeth Evolved From Body Armor of Extinct Species first appeared on Men's Journal on May 23, 2025
Time of India
22-05-2025
- Science
- Time of India
The secret history of teeth revealed: How they originated inside a 465-million-year-old fish's body
Our knowledge about the origins of teeth pertains to that of the entire body, a natural occurrence made up of tissues. But did you know that human teeth evolved from the "body armour" of an extinct fish that lived 465 million years ago? From vertebrates to teeth In a published in the journal Nature on Wednesday, researchers showed how sensory tissue discovered on the exoskeletons of ancient fish is linked to the same "genetic toolkit" that produces human teeth. Tired of too many ads? go ad free now "This shows us that 'teeth' can also be sensory even when they're not in the mouth," said Yara Haridy, co-author of the study and palaeontologist and evolutionary biologist at the University of Chicago. Initially, researchers set out to identify the earliest vertebrate in the fossil record seeking specimens from the Cambrian and Ordovician periods. An obvious sign of a vertebrate species is the presence of internal tubules for dentine, a calcified tissue that is found under the enamel in the human teeth, but also in the external bumps or odontodes in ancient fish armour. While making the use of high-resolution CT scans to analyse the jawless "first fish" species Anatolepis heintzi, the researchers discovered pores filled with dentine. They also compared the fossil to a coterie of ancient fossils and modern marine life. The shocking discovery Upon closer investigations, researchers realised that the supposed dentine-lined pores were like the sensilla, the sensory organs on the shells of crabs, thus making A. Heintz, an ancient invertebrate arthropod and not a vertebrate fish. Vertebrates and invertebrates, both have sensory armours connected to nerves that help them sense their environment. To substantiate the discovery that the fish was an arthropod, the team scanned fossils and modern specimens from snails and barnacles to sharks and catfish. It was revealed that the suckermouth catfish raised in Hardy's own lab had small tooth-like scales on their skin, called denticles, that were connected to nerves. Tired of too many ads? go ad free now This discovery also led to the realisation that ancient vertebrates had the same mineralized tissue that evolved into dentine and then our sensitive teeth. These tissues helped them sense their environment like cold waters or pressure from nearby objects, just like our teeth. Thus, this study also supports a key theory in evolutionary biology called the "outside-in" hypothesis where sensory structures evolved on exoskeletons at least 460 million years ago and were used by animals to make teeth. "Viewed through this evolutionary lens, the fact that teeth in the mouth are extremely sensitive is less of a mystery, and more a reflection of their evolutionary origins within the sensory armour of early vertebrates," wrote the researchers in the study.
