Holyoakia facts for kids
Quick facts for kids Holyoakia |
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| Holyoakia simpsoni, © Dave Simpson | |
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Corynexochida
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Corynexochina
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Dorypygidae
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Holyoakia
Palmer in Palmer & Rowell, 1995
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Holyoakia is a group of very tiny ancient sea creatures called trilobites. They were only about 7.5 millimeters long, which is smaller than your pinky nail! These amazing fossils have been found in places like South Australia and Antarctica. They lived a very long time ago, during a period called the late Lower Cambrian period, around 518 to 516 million years ago. Holyoakia belongs to a family of trilobites called Dorypygidae.
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Where the Name Comes From
The species Holyoakia simpsoni was named after David Simpson. He is from Adelaide and was the first person to find these special fossils.
Where Holyoakia Fossils Are Found
- Holyoakia granulosa fossils have only been found in Antarctica. They come from rocks that are part of the Shackleton Limestone. These rocks date back to the late Lower Cambrian period.
- Holyoakia simpsoni fossils are only found in South Australia. They come from the Emu Bay Shale, specifically in a place called Big Gully on Kangaroo Island. These fossils are also from the late Lower Cambrian period.
How Scientists Classify Holyoakia
Scientists first thought Holyoakia might belong to a different family of trilobites called Emuellidae. However, after looking more closely, they found that Holyoakia is quite different.
For example, Emuellidae trilobites have a head shield (called a cephalon) with a rounded front and clear grooves. They also have special eye ridges that look like hooks. Their body (thorax) has six segments, and the last one has much bigger spines.
Holyoakia is different because its head shield is more rectangular. Its eye ridges are hard to see. Its body has eight segments, and they are all similar in size. Also, the tail section (called the pygidium) of Holyoakia is almost as big as its head, which is not common for Emuellidae. These differences helped scientists place Holyoakia in the Dorypygidae family instead.
What Lived with Holyoakia?
Holyoakia simpsoni lived in the same ancient seas as other interesting trilobites. These included Redlichia takooensis, Estaingia bilobata, Balcoracania dailyi, and Megapharanaspis nedini. Studying these groups together helps scientists understand the ancient ecosystems.
