👉 Paranthrenini, or paranthrins, are a group of microscopic organisms found in the fossil record that include some of the most diverse and well-preserved groups known from the Cambrian period. These animals, also known as ammonoids, have been preserved in sedimentary layers for millions of years. Paranthrenini are characterized by their large, slender bodies, which can be up to 3 meters long. They are generally characterized by a single body cavity, often called a "