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Dorset, a county in the southwest of England, is known for its rich and diverse ammonite fossil record. While there are many common and well-known ammonite species found in Dorset, there are also some rare and sought-after specimens that are highly prized by collectors and scientists alike.

Some of the most rare and sought-after Dorset ammonites include:

1. Parkinsonia dorsetensis – This is a rare and unusual ammonite that is known for its distinctive spiral shape and prominent keel. It is only found in a few locations in Dorset and is highly prized by collectors.

2. Arnioceras semicostatum – This is another rare and unusual ammonite that is known for its distinctive ribbing and coiled shape. It is found in only a few locations in Dorset and is highly sought-after by collectors.

3. Androgynoceras capricornus – This is a rare and unusual ammonite that is known for its unique morphology and intricate suture patterns. It is found in only a few locations in Dorset and is highly prized by collectors and scientists alike.

4. Perisphinctes ammonites – This is a genus of large, heavily ribbed ammonites that are found in only a few locations in Dorset. They are highly prized by collectors for their distinctive morphology and impressive size.

Overall, the study of rare Dorset ammonites is an important part of paleontology, providing valuable insights into the evolution and diversification of these marine animals over millions of years. By studying these fossils, scientists can gain a better understanding of the history of life on Earth in Dorset, as well as the complex interactions between different species and their environments.